Glow Worm Repair Specialist
Repair Network has the experienced gas-safe engineer you need for repairs and service on your Glow Worm boiler.
Same or next day service, nationwide coverage, fixed-cost boiler repairs and a one-year guarantee.
Glow Worm Boilers
Glow Worm boilers are available as combi, system and regular models.
For more than 80 years, Glow Worm has been leading the heating industry in the UK. It started in 1934 in Derbyshire when the first boiler was produced. During the decades since, Glow Worm has been producing durable and long-lasting heating solutions.
Acquired by the Valliant brand in 2001, Glow Worm is now part of the second largest heating company in Europe. The brand is recognised as the leading manufacturer in high efficiency boilers since 2005.
Glow Worm offers warranties and guarantees for its boilers and their parts, depending on the model and package you choose.
Do you own any Glow Worm Boiler?
Require some form of repairs!
Book a certified technician with the tools and experience to repair all your Glow Worm Boiler!
Why Repair Network Nationwide?
When you have a broken boiler, you want a fast, reliable and efficient repair service that is also affordable. Repair Network promises a prompt boiler repair service, carried out by a local, qualified technician.
To limit the frustration and hassle of living without your boiler, we offer set appointment times to keep you from having to wait for a service call. We always strive to provide same or next day service.
Not only do we offer nationwide coverage, but all our local technicians are gas registered to ensure that your service is both high quality and safely carried out. We also guarantee to send a technician with experience working on your brand of boiler.
We always aim to fix your boiler, preventing you from having to replace it. Our repair, not replace policy comes with a one year guarantee.
What we Cover and What we Don’t
We are transparent with our pricing because our top goal is customer satisfaction.
All of our boiler repairs comes at a fixed cost and we won’t surprise you with hidden fees. The fixed cost includes labor and genuine brand approved parts.
If an engineer isn’t able to repair your Glow Worm boiler, they will offer a free, no-obligation quote for a replacement boiler, which includes installation.
Find your fault code for your Glow Worm boiler below:
What are the error codes Glow Worm Boilers and what do the mean?
Determine the model of your Glow Worm boilers and look to the ahead for the various error codes and what they mean.
Find your Error Code
Energy Boiler Range Fault Codes
| Fault codes | Meaning |
|---|---|
| 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. 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. Temperature rise 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 problem in 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
| Codes | Description |
|---|---|
| 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 - Turn DHW control knob into temperature range and turn CH temperature control knob into power (reset position) and wait for minimum of 30 seconds 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 boiler - Check for 230volts into the appliance, check fuse on pcb |
| Green LED flashing | Boiler in stand-by - Reset position |
Betacom a Range
| Codes | Description |
|---|---|
| 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 main board |
| F62 | Fault in the main board |
| F63 | Fault in the main board |
| F64 | Fault in the main board |
| F65 | Fault in the main board |
| F67 | Fault in the main board |
| F68 | Fluctuation of flame signal |
| F70 | User interface incompatible with the main board |
| 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
| Codes | Description |
|---|---|
| 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 main board |
| F62 | Fault in the main board |
| F63 | Fault in the main board |
| F64 | Fault in the main board |
| F65 | Fault in the main board |
| F67 | Fault in the main board |
| F68 | Fluctuation of flame signal |
| F70 | User interface incompatible with the main board |
| 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 |
CI Range
| Codes | Description |
|---|---|
| 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 | Main board connection fault |
| F12 | Connection fault between 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
| Codes | Description |
|---|---|
| F1 | Ignition fault |
| F2 | Fan/APS |
| F3 | Air fault |
| F4 | Ignition fault |
| F5 | Overheat Fault |
| F6 | Central heating flow thermistor |
| F7 | Domestic hot water thermistorhttps://www.repair-network.co.uk/wp-admin/post.php?post=1634&action=edit# |
| 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 | Main board connection fault |
| F12 | Connection fault between 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
| Codes | Description |
|---|---|
| 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 | Main board connection fault |
| F12 | Connection fault between 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 cx Range
| Codes | Description |
|---|---|
| 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) |
Flexicom hx Range
| Codes | Description |
|---|---|
| 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 |
| F25 | Circulation fault |
| F43 | Generic error |
| F70 | Software incompatible |
| F73 | Unable to see pump activate |
| F77 | Condensate pump error (optional) |
Flexicom sx Range
| Codes | Description |
|---|---|
| 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
| Codes | Description |
|---|---|
| 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 | Main board connection fault |
| F12 | Connection fault between main pcb and display pcb |
| F13 | Main pcb connection fault |
| F14 | Central heating flow temperature > 95 degrees |
| F16 | Flame detection fault |
| F17 | Power supply is less than 170v |
| F18 | User interface fault |
| F19 | Central heating thermistor unplugged |
| F20 | Software incompatibility |
| F24 | Cental heating return temperature > 90 degrees |
| F25 | Poor circulation |
| F26 | Poor circulation |
SI Range
| Codes | Description |
|---|---|
| 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 | Main board connection fault |
| F12 | Connection fault between 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 |
sxi Range
| Codes | Description |
|---|---|
| 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 | Main board connection fault |
| F12 | Connection fault between 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 | Cental heating return temperature > 90 degrees |
| F25 | Poor circulation |
| F26 | Poor circulation |
Ultracom₂ cxi Range and Ultracom₂ sxi Range
| Codes | Description |
|---|---|
| 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 main board |
| F62 | Fault in the main board |
| F63 | Fault in the main board |
| F64 | Fault in the main board |
| F65 | Fault in the main board |
| F67 | Fault in the main board |
| F68 | Fluctuation of flame signal |
| F70 | User interface incompatible with the main board |
| 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 |
Ultracom₂ 35 Store
| Codes | Description |
|---|---|
| F00 | Flow heating temperature sensor fault |
| F01 | Return heating temperature sensor fault |
| F02 | Hot water temperature sensor fault |
| F03 | Storage tank temperature sensor fault |
| F10 | Flow heating temperature sensor fault |
| F11 | Return heating temperature sensor fault |
| F12 | Hot water temperature sensor fault |
| F13 | Storage tank 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 main board |
| F62 | Fault in the main board |
| F63 | Fault in the main board |
| F64 | Fault in the main board |
| F65 | Fault in the main board |
| F67 | Fault in the main board |
| F68 | Fluctuation of flame signal |
| F70 | User interface incompatible with the main board |
| 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 |
| F79 | Storage tank temperature sensor fault |
| F81 | Overheating of hot water circuit |
| 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 |
Ultracom cxi Range and Ultracom cx Range
| Codes | Description |
|---|---|
| F1 | Ignition fault |
| F3 | Fan unable to reach ignition speed |
| F4 | Ignition fault |
| F5 | Overheat Fault |
| F6 | Central heating flow thermistor |
| F9 | Water pressure sensor fault, blocked flow filter or pump fault |
| F10 | Central return flow thermistor |
| F11 | Main board connection 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) |
| No display or Er | loose connection X51 |
Ultracom hxi Range
| Codes | Description |
|---|---|
| F1 | Ignition fault |
| F3 | Fan unable to reach ignition speed |
| F4 | Ignition fault |
| F5 | Overheat Fault |
| F6 | Central heating flow thermistor |
| F9 | Water pressure sensor fault, blocked flow filter or pump fault |
| F10 | Central return flow thermistor |
| F11 | Main board connection 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) |
| No display or Er | loose connection X51 |
Ultracom sxi Range
| Codes | Description |
|---|---|
| F1 | Ignition fault |
| F3 | Fan unable to reach ignition speed |
| F4 | Ignition fault |
| F5 | Overheat Fault |
| F6 | Central heating flow thermistor |
| F9 | Water pressure sensor fault, blocked flow filter or pump fault |
| F10 | Central return flow thermistor |
| F11 | Main board connection 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) |
| No display or Er | loose connection X51 |
Ultrapower sxi Range
| Codes | Description |
|---|---|
| F1 | Ignition fault |
| F3 | Fan unable to reach ignition speed |
| F4 | Ignition fault |
| F5 | Overheat Fault |
| F6 | Central heating flow thermistor |
| F9 | Water pressure sensor fault, blocked flow filter or pump fault |
| F10 | Central return flow thermistor |
| F11 | Main board connection 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) |
| No display or Er | loose connection X51 |
Xtramax HE Range
| Codes | Description |
|---|---|
| F1 | Ignition fault |
| F2 | Fan |
| F3 | Fan |
| F4 | Ignition fault |
| F5 | Overheat Fault |
| F6 | Central heating flow thermistor |
| F7 | Domestic hot water thermistor |
| F8 | Tank thermistor |
| F9 | Water pressure sensor fault (please contact GW technical department for further information) |
| F10 | Central return flow thermistor |
| F11 | Main board connection fault |
| F12 | User interface connection fault |
| F13 | PCB memory or sensing fault |
| F14 | Gas valve control defective |
| F16 | Flame detection fault |
| F17 | Power supply is less than 170v |
| F18 | User interface fault |
| F19 | Central heating thermistor unplugged |
| F20 | Software incompatibility |
| F23 | Water circulation fault |
| F24 | Cental heating return temperature > 90 degrees |
| F25 | Maximum temperature rise slope |
| F26 | Maximum delta temperature |
Xtrafast 96/120 Range and Xtrafast 96/120E1 Range
| Codes | Description |
|---|---|
| F00 | No fault |
| F02 | Air flow fault |
| F04 | Ignition fault - flame detection |
| F05 | Overheating |
| F06 | Central heating thermistor/wiring fault |
| F07 | Domestic hot water thermistor/wiring fault |
| F08 | Storage vessel thermistor/wiring fault |
| F09 | System pressure sensor fault |
| F10 | Fan fault |
| F11 | Poor circulation |
| F12 | User interface fault |
| F13 | Main pcb fault |
| F14 | Central heating flow temperature > 97 degrees |
| F15 | Gas mechanism fault |
| F20 | Communication fault |
Contact
- Phone: 03333 449104
- Email: info@repair-network.co.uk
- Address: Repair Network
3-5 Rickmansworth Road Watford
WD18 0GX 