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Find Professional Worcester Bosch Boiler Repairs in London

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Highly Experienced Engineers

At Worcester Boiler Repairs, we only take on the most experienced engineers, ensuring that every customer can be confident in the quality of their repair. Our engineers have a wealth of experience working with Worcester Bosch boilers, so you can be sure that your boiler will be in good hands.

Gas Safety Certified

Safety is paramount to us and all of our engineers are Gas Safe certified. This means that they are certified to carry out the repair in a safe and secure manner, ensuring that your boiler will be repaired with care and attention.

Customer Satisfaction

We are committed to customer satisfaction and we want to make sure that you are happy with the work that has been done. We guarantee that our fixed price repairs will provide high-quality work with no hidden fees or nasty surprises when you get the bill.

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Professional Worcester Boiler Repair and Maintenance

Common Worcester boiler problems we are asked to fix in London include:

No Hot Water

If there is no hot water but the heating is still working, it is likely that there is a fault with the diverter valve. We have experienced engineers who can quickly identify the problem and provide a long term fix. This could involve part replacements or a new boiler installation if the warranty has expired.

Lack of Pressure

A leaking Worcester boiler or loose connection on a rad valve can be the cause of a drop in pressure. Our team can diagnose the issue and provide a repair. We also provide regular maintenance and servicing to ensure that your boiler continues to work as it should.

Carbon Monoxide Leak

Carbon monoxide is a dangerous gas that can cause harm if it is present in your home. We provide comprehensive checks and repairs to ensure that your boiler is not leaking carbon monoxide. We will also check for other signs of damage and provide advice on how to keep your boiler running smoothly.

Get a High-Quality Fixed Price Repair from Boiler Repair Experts London

What are the most common Worcester boiler error codes/fault codes?

E01: Boiler Pressure Too Low

If your boiler pressure is too low, you will see the error code E01 on your Worcester boiler. This typically means that there is a leak in your system, and you will need to bleed your radiators to release any trapped air. You may also need to top up your boiler pressure.

E02: Boiler Pressure Too High

If your boiler pressure is too high, you will see the error code E02 on your Worcester boiler. This typically means that there is a problem with the pressure relief valve, and you will need to have it replaced by a qualified engineer.

E03: Ignition Failure

If the ignition fails on your Worcester boiler, you will see the error code E03. This typically means that there is a problem with the gas supply or the igniter itself. You will need to have the problem diagnosed by a qualified engineer.

E04: Flame Failure

If the flame fails on your Worcester boiler, you will see the error code E04. This typically means that there is a problem with the gas supply or the igniter itself. You will need to have the problem diagnosed by a qualified engineer.

E05: Temperature Sensing Fault

If there is a temperature sensing fault on your Worcester boiler, you will see the error code E05. This typically means that there is a problem with the thermostat or one of the temperature sensors. You will need to have the problem diagnosed by a qualified engineer.

E06: Pump Fault

If there is a pump fault on your Worcester boiler, you will see the error code E06. This typically means that there is a problem with the circulating pump or one of the valves in the system. You will need to have the problem diagnosed by a qualified engineer

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    ZACK DAWSON

  • I used this company twice now,always on time,and have done a great job,quite affordable too. Well recommended

    JAMES BEATIE

  • Absolute life savers! My boiler was leaking and a bunch of other things were happening. They offered to buy and fit a tap in for free, they also put in my washing machine for free when curry's didn't know how install it. I would 100% use them again! They also called up a plumber for me to sort out my pipes. Couldn't recommend them enough.

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Worcester Bosch Fault Codes by Boiler Model

CDI Classic Combi
CDI Compact
CDI Classic Regular
Greenstar I System 
Worcester Bosch GB162
Greenstar Ri
Greenstar 8000 life Combi

1. CDI Classic Combi / CDI Highflow Combi Boiler Error Codes

Fault Code System Behavior Solution
A1 Either water is leaking or the pump needs freeing or replacing due to the pump running dry. The best course of action is to bleed your radiators and check your boiler pressure. If the fault code is still showing once you’ve done so, contact Worcester Bosch so someone can take a further inspection.
A7 The hot water negative thermistor coefficient (NTC) sensor is defective – the connecting leads or hot water sensor need checking. Please contact Worcester Bosch so someone can take a further inspection.
A8 There has been a break in communication with FX sensor controls. Therefore your electrical connections need checking. Please contact Worcester Bosch so someone can take a further inspection.
B1 Code plug not detected Reset the boiler
C6 This means that the fan speed is too low. The fan lead and connector needs an inspection and possibly replacing. Please contact Worcester Bosch for a further inspection.
E2 This means that there is a problem with the central heating. The (NTC) sensor might also be defective. Please contact Worcester Bosch so someone can take a further inspection.
E9 This means there could be an issue with the system pressure as the safety temperature limiter in the central heating flow has been tripped. If you still see the fault after you’ve pressed ‘reset’ please contact Worcester Bosch for a further inspection
EA There is a problem regarding flame loss. First, you should examine if other gas appliances in your home are working normally so that you know for sure if there is a gas supply in the property. It’s worth checking that the gas supply is on at the meter, if the boiler still doesn’t turn on – then contact Worcester Bosch.
F0 This fault code symbolises an internal error within the boiler system. If the fault is still showing after you’ve pressed ‘reset’ please contact Worcester Bosch to get a further inspection.
F7 A flame has been detected, although the appliance is not on. Don’t be tempted to reset your boiler, instead, contact Worcester Bosch for a further inspection.
FA A flame has been detected even after the gas was shut off. The gas valve needs checking. Please contact Worcester Bosch to get a further inspection.
FD The ‘reset’ button has been pressed accidentally. Try pressing the ‘reset button again to fix this. However, if the problem persists, contact Worcester Bosch to get a further inspection.

2. Worcester Bosch CDI Compact / Greenstar 27/30 I System / Greenstar 25/30 SI Combi Boiler Error Codes

Fault Code System Behavior Solution
T1 The boiler is undertaking an ignition test and is thus in test mode. The boiler normally returns to normal operation once complete. If the problem persists, please contact Worcester Bosch for a further inspection.
T2 The boiler is undertaking a fan test and is thus in test mode. The boiler typically returns to normal operation once complete. If not, please contact Worcester Bosch for a further inspection.
T3 The boiler is undertaking a pump test and is thus in test mode. The boiler typically returns to normal operation once complete. If not, please contact Worcester Bosch for a further inspection.
T4 The boiler is undertaking a three-way valve test and is thus in test mode. The boiler typically returns to normal operation once complete. If not, please contact Worcester Bosch to get a further inspection.
T6 The boiler is undertaking an ionisation oscillator test and is thus in test mode. The boiler usually returns to normal operation once complete. If the issue persists, please contact Worcester Bosch to get a further inspection.
9A 362 An incorrect Heat Control Module (HCM) was installed. Please contact Worcester Bosch to get a further inspection.
C6 215 The fan speed is too high. Turn the boiler’s power off and on again. Once you’ve done this, if your boiler still doesn’t operate correctly, then contact Worcester Bosch.
EA 227 1.) No flame has been detected. There could be an issue with the gas valve and may need adjusting or replacing. 2.) Another reason is there could be a blockage in the siphon or the condensate discharge, check not frozen or blocked. 3.) There may also be damage to the ignition or electrode lead; a flame can’t be made without them. 4.) It could also be an internal leak onto an electrical component. Unfortunately, you cannot fix this yourself, so please contact Worcester Bosch for an engineer’s help. If you spot a leak, turn off your boiler and contact Worcester Bosch to get the components replaced.
F7 228 There is a flame error. You should try and reset the system, but contact Worcester Bosch for a further inspection if the issue persists.
FA 364 There is a gas valve leak. Turn off your boiler and contact Worcester Bosch to send out an engineer.
FB 365 This means there is a gas valve leak. Turn off your boiler and contact Worcester Bosch to send out an engineer.
A1 281 The pump is running with air in the system or stuck. Reset your boiler but if the issue persists, contact Worcester Bosch for an engineer’s help.
EF 349 The boiler’s operation is at a minimum burner load. Make sure the system pressure is between 1 and 1.5 bar. If the issue persists, then contact Worcester Bosch.
NO CODE 212 This means the safety or flow temperature is rising too fast. Reset your boiler but if the error continues then contact Worcester Bosch for an engineer.

3. Worcester Bosch CDI Classic Regular Boiler Error Codes

Fault Code System Behavior Solution
B1 Code plug was not detected If the fault still shows after you’ve pressed ‘reset’, contact Worcester Bosch for a further inspection.
C6 Fan speed is too low The fan lead and connector need inspection and possibly replacing. Please contact Worcester Bosch for a further inspection.
E2 The central heating (CH) flow negative thermistor coefficient (NTC) sensor is not working properly. Please contact Worcester Bosch so someone can do a further inspection.
E9 The safety temperature limiter in central heating (CH) flow tripped If the fault remains after you’ve pressed ‘reset’, contact Worcester Bosch for a further inspection.
EA Flame not detected You should examine if other gas appliances in your home are working normally, that way you’ll be certain if there is a gas supply in the property. Check if the gas supply is on at the meter, but if the boiler still doesn’t turn on, contact Worcester Bosch.
EA Flame not detected You should examine if other gas appliances in your home are working normally, that way you’ll be certain if there is a gas supply in the property. Check if the gas supply is on at the meter, but if the boiler still doesn’t turn on, contact Worcester Bosch.
F0 Internal error If the fault remains after you’ve pressed ‘reset, contact Worcester Bosch for a further inspection.
F7 Flame detected although the appliance is off Don’t try to reset your boiler. Contact Worcester Bosch for a further inspection instead.
FA Flame detected after gas shut off The gas valve needs checking. You won’t be able to fix this problem so please contact Worcester Bosch for a further inspection.
FD The reset button was pressed by mistake Press the ‘reset’ button again. If the problem continues, contact Worcester Bosch for a further inspection.

4. Worcester Bosch Greenstar I System / Combi Boiler Error Codes

Fault Code System Behavior Solution
226 The service tool is connected in the blocking error history menu Try and reset your boiler, if the error remains, then contact Worcester Bosch for an engineer’s help.
FD 231 The power got interrupted during a lockout Reset the boiler
C7 214 The fan does not run during the start-up phase – the fan’s harness connector should be checked Defective fan – call a boiler engineer
C6 215 Fan speed is too high – check the fan harness and connector Reset the boiler
C7 216 Fan speed is too low – check the fan harness and connector Reset the boiler
C7 217 The fan has stopped during appliance operation This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s help.
C1 264 The fan stopped during operation Reset the boiler. If the fault remains, call a boiler engineer.
C4 273 Due to continuous fan operation for 24 hours, the appliance is temporarily blocked It will shut off to protect the fan.
E2 222 The flow temperature sensor has shorted Call a boiler engineer.
E2 233 The flow temperature sensor is disconnected Call a boiler engineer.
E9 276 Primary flow temperature exceeded 95°C Check that the pressure is between 1.0 and 1.5 bar. Try to reset the boiler, but contact Worcester Bosch for an engineer’s help if the issue persists.
E2 350 The flow temperature sensor has shorted Check that the pressure is between 1.0 and 1.5 bar. Try to reset the boiler but if the issue persists, then contact Worcester Bosch for an engineer’s help.
E2 351 The flow temperature sensor is disconnected Check that pressure is between 1.0 and 1.5 bar. Try to reset the boiler. If the issue persists, then contact Worcester Bosch for an engineer’s help.
FA 306 Ionisation was detected after the gas valve closed Try to reset your boiler but if it doesn’t reset then contact Worcester Bosch.
EA 227 No ionisation was detected after ignition Please contact Worcester Bosch to get an engineer’s help. If you spot a leak, turn off your boiler and contact Worcester Bosch to get the components replaced.
F7 228 Isioniation current detected before burner start The best course of action is to reset the system, but please contact Worcester Bosch to further inspect if the issue persists.
EA 229 Loss of ionisation signal during operation Check the pressure is between 1.0 and 1.5 bar. Try to reset the boiler. If the issue persists, then contact Worcester Bosch for an engineer’s assistance.
EA 261 The heat control module (HCM) is potentially defective – reset the appliance Reset the boiler but if the issue remains, you will need to call a boiler engineer.
9U 233 The control box or heat control module (HCM) is either loose or defective, the HCM needs to be checked This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s help.
C4 237 The heat control module (HCM) or control box is defective Call a boiler engineer.
F0 238 Gas valve or control box error – check the gas valve coils Double-check that the system pressure is between 1.0 and 1.5 bar. Also, check whether other gas appliances are working as normal, to confirm that your gas supply is present. If you’ve done this and your boiler still isn’t operating correctly, then contact Worcester Bosch.
F0 239 The control box or the heat control module (HCM) is defective – the control box connections should be checked This may be an electrical issue, so please contact Worcester Bosch for an engineer’s help.
F0 242 The control box or the heat control module (HCM) is defective – the HCM and control box connections should be checked This may be an electrical issue, so please contact Worcester Bosch for an engineer’s help.
B7 257 Control box or the heat control module HCM) is defective- the HCM and control box connections should be checked Please contact Worcester Bosch for a further inspection.
F0 258 Control box or the heat control module (HCM) is defective – HCM or control box connections should be checked This isn’t something you can fix. Contact Worcester Bosch for an engineer’s assistance.
EH 258 Control box or the heat control module (HCM) is defective – HCM or control box connections should be checked This isn’t something you can fix. Contact Worcester Bosch for an engineer’s assistance.
F1 259 Control box or the heat control module (HCM) is defective – HCM or control box connections should be checked This isn’t something you can fix. Contact Worcester Bosch for an engineer’s assistance.
F0 262 Control box or the heat control module (HCM) is defective – HCM or control box connections should be checked This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s assistance.
F1 263 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s assistance.
F0 272 Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s assistance.
F0 280 Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s assistance.
F0 290 Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s assistance.
328 Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s assistance.
235 Incompatible heat control module (HCM) software versions – control box needs the latest software Please contact Worcester Bosch for an engineer’s assistance.
356 Low mains voltage – the voltage may be interrupted or inconsistent so it should be checked This may require an electrician if it’s an issue with your house mains
360 Heat control module (HCM) invalid – the inserted HCM does not correspond with the control box Please contact Worcester Bosch for an engineer’s assistance.
A8 362 Low mains voltage – the voltage may be interrupted, inconsistent or heat control module (HCM) invalid This may require an electrician if it’s an issue with your house mains
CC 800 Outdoor sensor defect available when an accessory outdoor sensor is connected Please contact Worcester Bosch for an engineer’s assistance.
A1 281 Pump stock or running dry Try to reset your boiler. If the issue persists, contact Worcester Bosch to send out an engineer.
E9 224 Flue or high limit thermostat activated Try to reset your boiler. If the issue persists then contact Worcester Bosch for a boiler’s assistance.
D4 341 Primary flow temperature rising too fast This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.

5. Worcester Bosch GB162 Boiler Error Codes

Fault Code System Behavior Solution
208 The boiler is in chimney sweep mode This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
200 The boiler is in heating mode Please contact Worcester Bosch for an engineer’s assistance.
201 The boiler is currently in domestic hot water (DHW) mode Please contact Worcester Bosch for an engineer’s assistance.
202 The boiler is waiting – there was a heat demand from the modulating or on-off control Please contact Worcester Bosch for an engineer’s assistance.
203 The boiler is on standby Please contact Worcester Bosch for an engineer’s assistance.
204 The boiler is waiting – the actual temperature is higher than the calculated or selected boiler temperature Please contact Worcester Bosch for an engineer’s assistance.
212 The temperature recorded by the safety or flow temperature sensor is rising too rapidly. Please contact Worcester Bosch for an engineer’s assistance.
226 The diagnosis tool was connected and is now locked out Please contact Worcester Bosch for an engineer’s assistance.
260 The flow temperature sensor doesn’t detect a rise in temperature after a burner start Please contact Worcester Bosch for an engineer’s assistance.
265 The boiler is waiting in response to a heat demand – it switches regularly to partial load Please contact Worcester Bosch for an engineer’s assistance.
268 Component test phase Please contact Worcester Bosch for an engineer’s assistance.
270 The boiler is modulating upwards Please contact Worcester Bosch for an engineer’s assistance.
283 The boiler is getting prepared for a burner start – the fan and pump are activated Please contact Worcester Bosch for an engineer’s assistance.
284 The gas valve is switched Please contact Worcester Bosch for an engineer’s assistance.
305 The boiler is waiting for the domestic hot water (DHW) operation to come to an end Try to reset the boiler, but contact Worcester Bosch for an engineer’s assistance if the issue persists.
235 The KIM (boiler identification module) is really new for the burner control unit Please contact Worcester Bosch for an engineer’s assistance.
360 The fitted KIM is not compatible with the burner control unit Please contact Worcester Bosch for an engineer’s assistance.
9A 361 The fitted burner control unit is not compatible with the KIM (boiler identification module). Please contact Worcester Bosch for an engineer’s assistance.
9U 233 The control box or heat control module (HCM) is loose or defective. Please contact Worcester Bosch for an engineer’s assistance.
A3 317 There is a short circuit in the flue gas temperature sensor contacts Please contact Worcester Bosch for an engineer’s assistance.
B7 257 The burner control unit or the KIM is defective Please contact Worcester Bosch for an engineer’s assistance.
C1 264 No power supply or control signal to the fan during operation Please contact Worcester Bosch for an engineer’s assistance.
C4 273 The boiler was switched off for 2 minutes because it had been operating continuously for over 24 hours Please contact Worcester Bosch for an engineer’s assistance.
C6 215 Fan speed is too high Please contact Worcester Bosch for an engineer’s assistance.
C6 216 Fan speed is too low Please contact Worcester Bosch for an engineer’s assistance.
C7 214 The fan does not run during the start phase Please contact Worcester Bosch for an engineer’s assistance.
C7 217 When starting up, the fan speed is irregular Reset the boiler or contact Worcester Bosch for an engineer.
CE 207 Water pressure is too low Try to top up the pressure so that the needle is between 1 and 1.5 bar. If the pressure continues to drop, contact Worcester Bosch as you may have a leak.
CE 266 Pump test failed Please contact Worcester Bosch for an engineer’s assistance.
D1 240 The boiler return temperature sensor contacts have short-circuited Please contact Worcester Bosch for an engineer’s assistance.
D1 241 The boiler return temperature sensor contacts have interrupted Please contact Worcester Bosch for an engineer’s assistance.
D3 232 The external switching contact has opened Please contact Worcester Bosch for an engineer’s assistance.
D4 213 The actual temperature recorded by the return or flow temperature sensor is rising too quickly Please contact Worcester Bosch for an engineer’s assistance.
D4 271 The actual temperature difference between flow and safety temperature sensor is too high Please contact Worcester Bosch for an engineer’s assistance.
D4 286 The boiler return temperature sensor detected a return temperature higher than 105°c Please contact Worcester Bosch for an engineer’s assistance.
E2 222 There is a short circuit in the flow temperature sensor contacts Please contact Worcester Bosch for an engineer’s assistance.
E2 223 The flow temperature sensor contacts have been interrupted Please contact Worcester Bosch for an engineer’s assistance.
E5 218 The temperature captured by the flow temperature sensor is over 105°C Please contact Worcester Bosch for an engineer’s assistance.
E9 210 The temperature measured by the flue gas sensor is too high and is open. Please contact Worcester Bosch for an engineer’s assistance.
E9 219 The safety temperature sensor has captured a temperature over 105°C Please contact Worcester Bosch for an engineer’s assistance.
E9 220 This means the safety temperature sensor contacts have shorted or the safety temperature sensor has detected a temperature above 130°c. Please contact Worcester Bosch for an engineer’s assistance.
E9 224 The contacts of the safety temperature sensor have been interrupted Please contact Worcester Bosch for an engineer’s assistance.
E9 276 That the primary flow temperature is over 95°C. Please contact Worcester Bosch for an engineer’s assistance.
E9 277 The safety temperature sensor has measured temperature over 95°C Please contact Worcester Bosch for an engineer’s assistance.
E9 285 the boiler return temperature sensor has measured a temperature higher than 95°c Please contact Worcester Bosch for an engineer’s assistance.
E9 318 The flue gas temperature sensor contacts are interrupted Please contact Worcester Bosch for an engineer’s assistance.
EA 227 An insufficient ionisation current was measured following ignition of the burner Unfortunately, this isn’t something you’ll be able to fix yourself, so please contact Worcester Bosch to send out an engineer. If you spot a leak, turn off your boiler and contact Worcester Bosch to get the components replaced.
EA 229 The ionisation current detected during the burning phase was insufficient Check the pressure is between 1.0 and 1.5 bar. Try to reset the boiler, if the issue still persists, then contact Worcester Bosch for an engineer’s assistance.
EA 234 The gas valve contacts were interrupted This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
EA 261 The burner control unit is faulty Try to reset the boiler but if the issue remains, then contact Worcester Bosch for an engineer’s assistance.
EA 269 The ignition device has been activated for a long period of time This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
F0 238 The burner control unit KIM is defective. Double-check to ensure the system pressure is between 1.0 and 1.5 bar. Also check any other gas appliances to see if they are working normally, to confirm that your gas supply is present. If you’ve done this and your boiler still won’t operate correctly, then contact Worcester Bosch.
F0 239 The burner control unit KIM (boiler identification module) has an error. Cabling may have poor contact breaks and pinching or the wiring and plug of the burner control unit need checking, along with the operating characteristics of the boiler by replacing the burner control unit. This may be an electrical issue, so please contact Worcester Bosch for an engineer’s assistance.
F0 242 – F0 253, and F0 255, F0 259, F0 263, F0 267, F0 272 The burner control unit (KIM) is defective – the wiring of the burner control unit needs to be checked, along with the operating characteristics of the boiler by replacing the burner control unit. This may be an electrical issue, so please contact Worcester Bosch for an engineer’s assistance.
F0 278 The sensor test failed – plug sensors and cabling need to be checked This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
F0 279 The burner control unit, or KIM, is faulty – the control unit may need replacing This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
F0 280 The burner control unit is faulty This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s assistance.
F0 287 The burner control unit, or KIM, has some error This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
F0 290 The KIM or burner control unit is defective Contact Worcester Bosch for an engineer’s assistance.
F7 228 An ionisation current was detected before the burner started The best thing to do is to try and reset the system, if the issue persists then please contact Worcester Bosch to take a further inspection.
F7 328 A brief power failure has occurred This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
FA 306 An ionisation current was measured after the burner shut off Try to reset your boiler, if it doesn’t reset then contact Worcester Bosch.
FD 231 The mains voltage was interrupted due to an interlocking fault Try to reset your boiler, but if the code remains, contact an electrician.
EC 256 The burner control unit has an error This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
EH 258 The burner control unit is faulty – check the plug and wiring. This isn’t something you’ll be able to fix. Contact Worcester Bosch for an engineer’s assistance.
GB162 The ignition device has been activated for too long. This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
H07 The current water pressure is extremely low which limits the performance in heat mode, along with domestic hot water (DHW) mode This isn’t something you’ll be able to fix. Please contact Worcester Bosch for an engineer’s assistance.
HrE The boiler keeps resetting You need to contact an engineer to fix this problem.
rE The boiler resets Wait for the boiler to reset, if the issue persists – then please contact Worcester Bosch for an engineer’s assistance.

6. Worcester Bosch Greenstar Ri Boiler Faults Codes

Fault Code System Behavior Solution
No light There is no power at the control board Try to reset the boiler, but contact Worcester Bosch for an engineer’s assistance if the issue persists.
Light on Appliance on but not operating during demand Try to reset the boiler, but contact Worcester Bosch for an engineer’s help if the issue remains.
Slow flash (mostly off flashes on) Ignition lockout. Try to reset your boiler. This can be done by turning the control knob anti-clockwise to reset the position. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
Slow flash (mostly on flashes off) Flue overheats or heat exchangers overheat. Try to reset your boiler. This can be done by turning the control knob anti-clockwise to reset the position. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
Fast flash Volatile lockout sensor fan or code plug Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
5 pulses The Check-service mode switch is in the max position. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.

7. Worcester Bosch Greenstar 8000 life Combi Boiler Error Codes

Fault Code System Behavior Solution
200 O The boiler is in heating mode. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
201 O Boiler in hot water mode. Try resetting the boiler. This should fix it.
202 O The boiler is in anti-cycle mode. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
203 0 This means the boiler is on standby – no heat energy demand. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
204 O The current primary water temperature is higher than the set value. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
208 O This shows that the boiler is in chimney sweep demand. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
224 V The safety temperature limiter has tripped. Try top-up water until the reset pressure is reached. If the issue persists, then contact Worcester Bosch for an engineer’s help.
227 V There is no flame signal after the ignition burner. The control unit may need replacing. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
228 V There is a flame signal without a flame present. The air/gas ratio control valve may need to be replaced. Try to reset the boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
305 0 The boiler is in hot water anti-cycle mode. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
306 V There is an issue with the flame signal after the fuel supply is closed. The air/gas ratio control valve may need to be replaced. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
815 W/B The low loss header temperature sensor is faulty. Check the sensor port or the differential sensor may be installed incorrectly or damaged. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1010 O There is no BUS communication cable, EMS-Bus isn’t connected or is damaged – connect the cable for the EMS-Bus or replace the damaged cable exchange fuse. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1017 W The water pressure is too low – the water needs topping up and the pressure sensor or vent system could need replacing. Try topping up your pressure. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1021 B The hot water temperature sensor is faulty – the plug to the hot water temperature sensor may be disconnected.. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1022 B The hot water storage temperature sensor does not work. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1037 W The outside temperature sensor is not working – check the connecting lead. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1065 B The pressure sensor is not connected or defective – check the pressure sensor connection because it may need to be replaced.. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1068 W The outside temperature sensor does not work – check the connecting lead. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1073 W The temperature sensor may need replacing. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1074 W No signal from the flow temperature sensor available – connect the plug to the flow temperature sensor correctly or the temperature sensor might need to be replaced. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1075 W Short circuit of the temperature sensor at the heating block – temperature sensor may need replacing. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
1076 W There is no signal from the temperature sensor at the heating block available – replace the temperature sensor, the connecting lead or the control unit. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2920 V Error with the flame monitoring. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2924 V No feedback from the modulating gas valve. The gas valve relay is defective. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2925 V Feedback from the modulating gas valve is too low. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2927 B The flame failed during the burner operation. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2946 V The incorrect code plug has been detected – it needs replacing. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2948 B There is no flame signal. If the fault occurs, again and again, the setting of the CO2 valves need to be checked. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2950 B There is no flame signal. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2963 B The signal from the heat exchanger and the flow temperature sensor is outside of range. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2964 B The flow rate in the heat exchanger is too low. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2965 B The flow temperature is too high. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
966 B The flow temperature rise in the heat exchanger is very rapid. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2967 B The heat/flow exchanger temperature sensor differential is too great. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2970 B The pressure drop in the heating system is too fast. Try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.
2971 B The system pressure is too low – the heating system needs venting or water needs topping up until the preset pressure is reached. To fix, replace the cable to the pressure sensor and replace the pressure sensor. Otherwise, try to reset your boiler. If this does not fix the problem then contact Worcester Bosch for an engineer’s help.

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    Boiler Repair Experts London is your one-call solution for a wide range of boiler maintenance and repair needs. We are fully insured professional team. Our boiler repair engineers are accredited with skilled professional experience. Your safety is of outmost important to us, therefore, we only employ engineers who have been carefully vetted and approved.
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