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Expert Glow Worm Boiler Repairs in London

Professional, Reliable and Fast Service

At Boiler Repairs Experts London, we provide expert Glow Worm boiler repairs no matter where you are based in London. We have years of proven experience diagnosing and repairing Glow Worm boilers and guarantee a fast response time with emergency callouts within 60 minutes.
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Fixed Price Repairs

We offer fixed price repairs for all Glow Worm boiler models, so you can rest assured that the price you are quoted is the price you will pay. Our experienced Gas Safe registered engineers provide a friendly and professional service, aiming to fix your boiler quickly and efficiently.

24/7 Service

We understand that boiler emergencies can happen at any time, so we offer a 24/7 service with no local London call out fees. When you require assistance, we can be with you within 60 minutes, providing the highest quality service at short notice.

Quality Assurance

At Boiler Repairs Experts London, we are committed to providing the highest quality service and strive to exceed customer expectations. We use only the best quality parts and materials in our repairs and maintenance services, so you can rest assured that your Glow Worm boiler is in safe hands with us.

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

Faq's

Why is my Glow-Worm boiler not igniting?

Is your Glow-Worm boiler not igniting? Don't worry, it could be a common issue. Find the error code to determine which specific problem needs attention and remember that some repairs may require an engineer's expertise.

Why is my boiler not firing up?

Is your boiler not firing up? An F16 error code may be to blame, a common issue with Glow-Warm boilers that requires expert attention from an experienced engineer.

How do I reset my Glow-Worm boiler?

Are you having trouble with your new Glow-Worm boiler? There's a reset button beneath the display that could help, though some issues may require professional assistance from an engineer.

Why is hot water working but not heating?

Hot water working but not heating? Don't worry! It could be an issue with the Glow Worm boiler, such as broken diaphragms or airlocks. Have a professional engineer take care of it and you'll soon have hot water running again.

OUR CLIENTS SAY

  • Boiler Repair London has been the best Heating and Plumbing services in London. They've carried out a comprehensive & complete Boiler installation in nw10 for my property. Have also installed a new shower for me and fixed a leaking boiler at my flat in w10 ladbroke grove. My tenant were very happy with the work, clean and tidy. Also great value for money as I chose them over many other quotes provided. Very friendly staff also professional with good quality of work. I couldn't recommend enough. Best heating services london

    SUZZANE LIPSON

  • Positive: Punctuality, Quality, Responsiveness, Value I've had an amazing experience with boiler repair experts London, they were responsive and efficient. Highly recommended for those that seek heating and plumbing services.

    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.

    SVEN GREYJOY

GLOW WORM BOILER FAULT CODES AND ERROR CODES

Flexicom CX
Energy Boiler Range
Betacom Range
Betacom A Range
Betacom C Range
Compact E Range
Compact S Range

Flexicom CX Range

Fault Code Possible Cause
F1 Ignition fault
F3 Fan unable to reach ignition speed
F4 Ignition fault
F5 Overheat Fault
F6 Central heating flow thermistor
F7 Domestic hot water thermistor
F9 Water pressure sensor fault, blocked flow filter or pump fault
F10 Central return flow thermistor
F11 Flow and or return thermistor fault
F13 PCB memory or sensing fault
F14 Gas valve control defective
F15 E-bus voltage failure
F22 Low water pressure or ignition temperature rise too slow
F24 Central heating return temperature > 90 degrees
F25 Circulation fault
F43 Generic error
F70 Software incompatible
F73 Unable to see pump activate
F77 Condensate pump error (optional)

Energy Boiler Range

Fault Code Possible Cause
F.00 Fault: Flow temperature sensor
F.01 Fault: Return temperature sensor
F.10 Short circuit: Flow temperature sensor
F.11 Short circuit: Return temperature sensor
F.12 and F.91 Short circuit: Cylinder temperature sensor
F.13 Short circuit: Domestic hot water cylinder temperature sensor
F.20 Safety switch-oft. The overheating temperature reached
F.22 Safety switch-oft. Low water pressure in the boiler
F.23 Safety switch-oft. Temperature difference too great (NTC1/NTC2)
F.24 Safety switch-oft. The temperature rises too fast
F.25 Safety switch-off. Flue gas temperature too high
F.27 Safety switch-off. Fault in flame detection
F.28 Fault: Ignition unsuccessful when starting up
F.29 Fault: Flame loss
F.32 Fan frost protection function active: Fan speed outside the tolerance values
F.33 Fan frost protection function active: Air pressure switch fault
FA9 eBUS fault: Voltage too low
F.61 Fault: Gas valve control system
F.82 Fault: Gas valve switch-off control
F.83 Fault: EEPROM
F.64 Fault: Electronics/sensor/analogue-to-digital converter
F.85 Fault: Electronics temperature too high
F.67 Value sent back by ASIC is incorrect (flame slgnal)
F.88 Fault: Unstable flame (analogue input)
F.70 Invalid product code (DSN)
F.71 Fault: Flow/return temperature sensor
F.72 Fault: Deviation in the water pressure sensor/return temperature sensor
F.73 Fault: Water pressure sensor not connected or has short-circuited
F.74 Fault: Electrical problemin the water pressure sensor
F.75 Fault: Pressure sensor
F.78 The safety cut-out in the primary heat exchanger is defective
F.77 Fault: Condensate or smoke
F.78 Interruption to DHW outlet sensor at external controller
F.83 Fault: Burner temperature sensor
F.84 Fault: Flow/return temperature sensor
F.85 Fault: Temperature sensor
F.88 Fault: Underfloor heating contact
F.87 Fault: Electrodes
F.88 Fault: Gas valve
F.89 Fault: Pump
Connection No communication between the PCB and the user interface

Betacom Range

Fault Code Possible Cause
Red LED on Lockout – Low water pressure, Make sure pressure is above 1.5bar, reset boiler
Red LED flashing DHW temperature control knob in service position – Turn DHW control knob into temperature range
Red LED flashing Overheat – Check both overheat stats
Yellow LED flashing Error – Wait for a minimum of 30 seconds after turning the DHW control knob into the temperature range and the CH temperature control knob into power (reset position) before turning into either summer or temperature position.
Yellow LED on Flame present on the burner
Green LED on Boiler ready for operation
Green LED off No power to the boiler – Check for 230volts into the appliance, check the fuse on pcb
Green LED flashing Boiler in stand-by – Reset position

Betacom A Range

Fault Code Possible Cause
F00 Flow heating temperature sensor fault
F01 Return heating temperature sensor fault
F10 Flow heating temperature sensor fault
F11 Return heating temperature sensor fault
F20 Overheating fault
F22 Low water pressure
F23 Water circulation fault
F24 Water circulation fault
F26 Fault in gas valve
F27 Flame detection fault
F28 Ignition fault
F29 Loss of flame during operation
F32 Incorrect air pressure
F49 EBUS voltage fault
F61 Fault in the mainboard
F62 Fault in the mainboard
F63 Fault in the mainboard
F64 Fault in the mainboard
F65 Fault in the mainboard
F67 Fault in the mainboard
F68 Fluctuation of flame signal
F70 User interface incompatible with the mainboard
F71 Flow heating temperature sensor fault
F72 Permanent temperature difference between flow and return heating sensors
F73 Heating circuit pressure sensor fault
F74 Heating circuit pressure sensor fault
F76 Thermal fuse fault
F77 Fault in gas valve motor
F83 No water in the installation
F84 Permanent temperature difference between flow and return heating sensors
F85 Flow and Return heating sensor fault
F86 Underfloor heating contact fault
Err User interface fault

Betacom C Range

Fault Code Possible Cause
Temperature 30 flashing Fault on CH thermistor
Temperature 40 flashing Fault on DHW thermistor
Temperature 50 flashing Fault on outside sensor
Temperature 60 flashing Low system pressure
Temperature 70 flashing Fault on APS
Temperature 80 flashing Overheat open circuit
Temperature 90 flashing Flame or gas failure

Compact E Range

Fault Code Possible Cause
No DHW Check dhw microswitch
No C/H Check the microswitch if dhw demand-led is lit
No C/H but the boiler is firing Check divertor motor and cartridge
Boiler locks out within 10 seconds Check pump proving switch, an air pressure switch and overheat stat
Poor burner pressure Check burner pressure/ignition adjustment pots on PCB

Compact S Range

Fault Code Possible Cause
No DHW Check external controls, Please test for 230V on switch live to contact
No C/H Check external controls, Please test for 230V on switch live contact
No C/H or DHW Check external controls, Please test for 230V on switch live contact
Boiler locks out within 10 seconds Check pump proving switch, an air pressure switch and overheat stat
Poor burner pressure Check burner pressure/ignition adjustment pots on PCB
CI Range Boiler
CI Plus Range
CXI Range
Flexicom HX Range
Flexicom SX Range
HXI Range Boiler
SI Range Boiler
SXI Range Boiler

CI Range Boiler

Fault Code Possible Cause
F1 Ignition fault
F2 Fan/APS
F4 Ignition fault
F5 Overheat Fault
F6 Central heating flow thermistor
F7 Domestic hot water thermistor
F8 Tank thermistor (N/A For this appliance)
F9 Water pressure sensor fault (please contact GW technical department for further information
F10 Central return flow thermistor
F11 Mainboard connection fault
F12 Connection fault between the main pcb and display pcb
F13 Main pcb connection fault
F14 Central heating flow temperature > 95 degrees
F15 Gas valve stepper motor fault
F16 Flame detection fault
F17 Power supply is less than 170v
F18 User interface fault
F19 Central heating thermistor unplugged
F20 Software incompatibility

CI Plus Range

Fault Code Possible Cause
F1 Ignition fault
F2 Fan/APS
F4 Ignition fault
F5 Overheat Fault
F6 Central heating flow thermistor
F7 Domestic hot water thermistor
F8 Tank thermistor (N/A For this appliance)
F9 Water pressure sensor fault (please contact GW technical department for further information
F10 Central return flow thermistor
F11 Mainboard connection fault
F12 Connection fault between the main pcb and display pcb
F13 Main pcb connection fault
F14 Central heating flow temperature > 95 degrees
F15 Gas valve stepper motor fault
F16 Flame detection fault
F17 Power supply is less than 170v
F18 User interface fault
F19 Central heating thermistor unplugged
F20 Software incompatibility

CXI Range

Fault Code Possible Cause
F1 Ignition fault
F2 Fan
F3 Fan unable to reach ignition speed
F4 Ignition fault
F5 Overheat Fault
F6 Central heating flow thermistor
F7 Domestic hot water thermistor
F8 Tank thermistor (N/A For this appliance)
F9 Water pressure sensor fault (please contact GW technical department for further information
F10 Central return flow thermistor
F11 Mainboard connection fault
F12 Connection fault between the main pcb and display pcb
F13 Main pcb connection fault
F14 Central heating flow temperature > 95 degrees
F15 Gas valve stepper motor fault
F16 Flame detection fault
F17 Power supply is less than 170v
F18 User interface fault
F19 Central heating thermistor unplugged
F20 Software incompatibility
F24 Central heating return temperature > 90 degrees
F25 Poor circulation
F26 Poor circulation

Flexicom HX Range

Fault Code Possible Cause
F1 Ignition fault
F3 Fan unable to reach ignition speed
F4 Ignition fault
F5 Overheat Fault
F6 Central heating flow thermistor
F9 Low water pressure Sensor
F10 Central return flow thermistor
F11 Flow and or return thermistor fault
F13 PCB memory or sensing fault
F14 Gas valve control defective
F15 E-bus voltage failure
F22 Low water pressure or ignition temperature rise too slow
F24 Central heating return temperature > 90 degrees
F25 Circulation fault
F43 Generic error
F70 Software incompatible
F73 Unable to see pump activate
F77 Condensate pump error (optional)

Flexicom SX Range

Fault Code Possible Cause
F1 Ignition fault
F3 Fan unable to reach ignition speed
F4 Ignition fault
F5 Overheat Fault
F6 Central heating flow thermistor
F7 Domestic hot water thermistor
F9 Low water pressure Sensor
F10 Central return flow thermistor
F11 Flow and or return thermistor fault
F13 PCB memory or sensing fault
F14 Gas valve control defective
F15 E-bus voltage failure
F22 Low water pressure or ignition temperature rise too slow
F25 Circulation fault
F43 Generic error
F70 Software incompatible
F73 Unable to see pump activate
F77 Condensate pump error (optional)

HXI Range Boiler

Fault Code Possible Cause
F1 Ignition fault
F2 Fan
F3 Fan unable to reach ignition speed
F4 Ignition fault
F5 Overheat Fault
F6 Central heating flow thermistor
F7 Domestic hot water thermistor
F8 Tank thermistor (N/A For this appliance)
F9 Earlier models only (please contact GW technical department for further information)
F10 Central return flow thermistor
F11 Mainboard connection fault
F12 Connection fault between the main pcb and display pcb
F13 PCB memory or sensing fault
F14 Central heating flow temperature > 95 degrees
F15 Flame detection fault
F17 Power supply is less than 170v
F18 User interface fault
F19 Central heating thermistor unplugged
F20 Software incompatibility
F22 Low water pressure or ignition temperature rise too slow
F24 Central heating return temperature > 90 degrees
F25 Poor circulation
F25 Poor circulation

SI Range Boiler

Fault Code Possible Cause
F1 Ignition fault
F2 Fan/APS
F4 Ignition fault
F5 Overheat Fault
F6 Central heating flow thermistor
F7 Domestic hot water thermistor
F8 Tank thermistor (N/A For this appliance)
F9 Earlier models only (please contact GW technical department for further information)
F10 Central return flow thermistor
F11 Mainboard connection fault
F12 Connection fault between the main pcb and display pcb
F13 PCB memory or sensing fault
F14 Central heating flow temperature > 95 degrees
F15 Gas valve stepper motor fault
F16 Flame detection fault
F17 Power supply is less than 170v
F18 User interface fault
F19 Central heating thermistor unplugged
F20 Software incompatibility

SXI Range Boiler

Fault Code Possible Cause
F1 Ignition fault
F2 Fan
F3 Fan unable to reach ignition speed
F4 Ignition fault
F5 Overheat Fault
F6 Central heating flow thermistor
F7 Domestic hot water thermistor
F8 Tank thermistor (N/A For this appliance)
F9 Earlier models only (please contact GW technical department for further information)
F10 Central return flow thermistor
F11 Mainboard connection fault
F12 Connection fault between the main pcb and display pcb
F13 PCB memory or sensing fault
F14 Central heating flow temperature > 95 degrees
F15 Gas valve stepper motor fault
F16 Flame detection fault
F17 Power supply is less than 170v
F18 User interface fault
F19 Central heating thermistor unplugged
F20 Software incompatibility
F24 Central heating return temperature > 90 degrees
F25 Poor circulation
F26 Poor circulation

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