Boiler Fault Code Lookup
What the code on your boiler display actually means — and whether it is something you can sort yourself or something that needs an engineer.
Read this first
Some codes you can clear. Some you should not touch.
A fault code is the boiler telling you which of its safety checks failed. Some of those are genuinely trivial — low system pressure is the most common code any engineer sees, and topping the system back up is a two minute job you can do yourself.
Others are the boiler shutting itself down because something is wrong with combustion, the flue, or the gas supply. Those exist to protect you and they are not to be reset repeatedly until the boiler gives in. If a fault clears and comes straight back, that is the appliance telling you the problem has not gone away.
- Safe to try yourself: repressurising a system showing low pressure, resetting once after a power cut
- Call an engineer: any ignition, flame, fan or flue fault, and anything that returns after one reset
- Call 0800 111 999 immediately: if you can smell gas, whatever the display says
Codes vary between models even within the same manufacturer, so treat the tables below as a guide and your boiler manual as the authority. If in doubt, ring us — telling you over the phone that it is nothing costs you nothing.
Worcester Bosch
Worcester Bosch fault codes.
Codes for Greenstar i, Si Compact, CDi Compact and CDi Classic models.
Greenstar i System/Combi Boiler
| Code | What it means |
|---|---|
| FD | Power interrupted |
| C7 | Fan not running on start-up |
| C6 | Fan speed too high or too low |
| C1 | Fan stopping during operation |
| C4 | Fan has failed to stop |
| E2 | Flow temperature issue |
| E9 | Primary flow temperature exceeding 95° |
| FA | Ionisation detected after gas valve closed |
| EA | No ionisation detected after ignition |
| F7 | Ionisation detected before burner start |
| 9U | Control box defective or loose |
| C4 | Control box or heat control module defective |
| F0 | Gas valve/control box error |
| A8 | Heat control module invalid |
| CC | Outdoor sensor defect |
| A7 | Domestic hot water sensor defect |
| A1 | Pump stuck or running dry |
| E9 | Flue or high limit thermostat activated |
| D4 | Primary flow temps rising too fast |
Greenstar Si Compact Boiler
| Code | What it means |
|---|---|
| T1 | Ignition test |
| T2 | Fan test |
| T3 | Pump test |
| T4 | Three way valve test |
| T6 | Ionisation oscillator test |
| 9A 362 | Incorrect HCM fitted |
| 9U 233 | Heat Control Module (HCM) error — problem with code plug |
| B7 257 | Internal error — potential control board problem |
| C6 215 | Fan problem — fan running too fast |
| C7 214 | Fan problem — fan not running |
| D1 240 | Return sensor error — sensor may be wet or damaged |
| E2 222 | Flow sensor short circuit error |
| E5 218 | Flow temperature too high |
| E9 219 | Safety sensor fault — temperature too high, sensor short circuit or open circuit |
| EA 227 | No flame detected or flame signal loss during operation |
| F0 237 | Internal error |
| F7 228 | Flame error — false flame or flame detected before burner started |
| FA 306 | False flame fault — flame detected after burner stop |
| FD 231 | Mains power fault — electrical power interruption |
| FA 364 | Gas valve EV2 leak test failed |
| FB 365 | Gas valve EV1 leak test failed |
| A1 281 | Pump stuck or running with air in the system |
| C1 264 | Airflow stopped during operation |
| C4 273 | Airflow present during last 24 hours |
| D4 271 | Temperature difference between flow and safety sensor exceeds limit |
| D1 240 | Return sensor short circuit |
| E9 224 | Max thermostat activated — flue gas thermostat overheat |
| EA 227 | No ionisation detected after ignition |
| EF 349 | Central heating boil detected — boiler operating at minimum burner load with temperature difference greater than 18°C between flow and return |
| NO CODE 212 | Safety or flow temperature rising too fast |
CDi Classic Regular Boiler
| Code | What it means |
|---|---|
| B1 | Code plug not detected |
| C6 | Fan speed too low or too high |
| E2 | Central heating flow negative thermistor coefficient (NTC) sensor defective |
| E9 | Safety temperature limiter in central heating flow has tripped |
| EA | Flame not detected |
| F0 | Internal error |
| F7 | Flame detected even though appliance switched off |
| FA | Flame detected after gas shut off |
| FD | Reset button pressed by mistake |
CDi Compact Boiler
| Code | What it means |
|---|---|
| T1 | Ignition test |
| T2 | Fan test |
| T3 | Pump test |
| T4 | Three-way valve test |
| T6 | Ionisation oscillator test |
| 9A 362 | Incorrect HCM fitted |
| 9U 233 | Heat Control Module (HCM) error — problem with code plug |
| B7 257 | Internal error — potential control board problem |
| C6 215 | Fan problem — fan running too fast |
| C7 214 | Fan problem — fan not running |
| D1 240 | Return sensor error — sensor may be wet or damaged |
| E2 222 | Flow sensor short circuit error |
| E5 218 | Flow temperature too high |
| E9 219 | Safety sensor fault — temperature too high, sensor short circuit or open circuit |
| EA 227 | No flame detected or flame signal loss during operation |
| F0 237 | Internal error |
| F7 228 | Flame error — false flame or flame detected before burner started |
| FA 306 | False flame fault — flame detected after burner stop |
| FD 231 | Mains power fault — electrical power interruption |
| FA 364 | Gas valve EV2 leak test failed |
| FB 365 | Gas valve EV1 leak test failed |
| A1 281 | Pump stuck or running with air in the system |
| C1 264 | Airflow stopped during operation |
| C4 273 | Airflow present during last 24 hours |
| D4 271 | Temperature difference between flow and safety sensor exceeds limit |
| D1 240 | Return sensor short circuit |
| E9 224 | Max thermostat activated — flue gas thermostat overheat |
| EA 227 | No ionisation detected after ignition |
| EF 349 | Central heating boil detected — boiler operating at minimum burner load with temperature difference greater than 18°C between flow and return |
| NO CODE 212 | Safety or flow temperature rising too fast |
CDi Classic Combi Boiler
| Code | What it means |
|---|---|
| A1 | Water is leaking, or the pump needs replacing or freeing due to running dry |
| A7 | The hot water NTC sensor is defective — the hot water sensor or connecting leads need checking |
| A8 | Break in communication to FX sensor controls — electrical connections need checking |
| B1 | Code plug not detected |
| C6 | Fan speed too low — the fan lead and connector need checking and may need replacing |
| E2 | Central heating water flow NTC sensor defective — check CH flow NTC sensor and connection leads |
| E9 | Safety temperature limiter in central heating flow has tripped — system pressure or safety temperature limiter needs checking |
| EA | Flame not detected due to a gas issue — gas supply, power supply or igniter, electrode and lead need checking. Contact a Gas Safe engineer |
| F0 | Electrical connector contacts or programmer interface module — check ignition leads are not loose |
| F7 | Flame detected even though the appliance is switched off — check the electrode assembly is dry and the PCB and flue are clear |
| FA | Flame detected after gas shut off — the gas valve needs checking. Contact a Gas Safe engineer |
| FD | Reset button pressed by mistake — press reset button again |
CDi Highflow Boiler
| Code | What it means |
|---|---|
| A1 | Pump dry run detection, or pump running in air — the system pressure needs checking |
| A5 | Tank NTC defect |
| A7 | Domestic hot water NTC defect |
| A8 | Energy Management System (EMS) communication error |
| B1 | Code plug not detected |
| B2, B3, B4, B5, B6 | Data error |
| B7 | Burner control error |
| C6 | Fan defect |
| D3 | External temperature limiter |
| D5 | Condensate pump failure |
| D6 | Internal heat bank overflow |
| EA | Flame not detected |
| E2 | Primary NTC defect |
| E9 | Safety temperature limiter in central heating flow stat tripped |
| F0 | Internal error |
| F1 | ROM fault |
| F7 | Flame detected after appliance has been shut off |
| FA | Flame detected after gas shut off |
| FD | Reset button pressed — try pressing the reset button again |
Greenstar 8000
| Code | What it means |
|---|---|
| 200 O | Boiler in heating mode |
| 201 O | Fan not running on start-up |
| 202 O | Boiler in anti-cycle mode |
| 203 O | Boiler in standby mode |
| 204 O | Current primary water temperature higher than set value |
| 208 O | Chimney sweep demand |
| 224 V | Safety temperature limiter has tripped — top up water until the reset pressure is reached |
| 227 V | No flame signal after ignition — burner control unit could need replacing |
| 228 V | Flame signal without flame present — air/gas ratio control valve may need replacing, as might the ionisation cable |
| 305 O | Boiler in hot water anti-cycle mode |
| 306 V | Flame signal after closing the fuel supply — the air/gas ratio control valve might need replacing |
| 360 V | Incompatible code plug — check a correct code plug is installed, and exchange or reconnect it |
| 815 W/B | Low loss header temperature sensor faulty — check the sensor port, or check the differential sensor for incorrect installation position or breakage |
| 1010 O | No BUS communication cable — EMS-Bus is not connected or is damaged. Connect the cable for the EMS-Bus, replace the damaged cable, or exchange the fuse |
| 1017 W | Water pressure too low — the water needs topping up, and the vent system or pressure sensor may need replacing |
| 1021 B | Hot water temperature sensor is defective — the plug to the hot water temperature sensor may not be connected |
| 1022 B | Hot water storage temperature sensor is defective — connect the plug correctly, mount the sensor correctly, or replace it |
| 1037 W | Outside temperature sensor is defective — check the connecting lead |
| 1065 B | Pressure sensor defective or not connected — check the pressure sensor connection as it may need replacing |
| 1068 W | Outside temperature sensor defective — check the connecting lead |
| 1073 W | Short circuit of the flow temperature sensor — the temperature sensor may need replacing |
| 1074 W | No signal from the flow temperature sensor available — connect the plug correctly, or the sensor could need replacing |
| 1075 W | Short circuit of the temperature sensor at the heating block — the sensor may need replacing |
| 1076 W | No signal from the temperature sensor at the heating block — replace the sensor, the connecting lead, or the control unit |
| 2920 V | Error with the flame monitoring |
| 2924 V | No feedback from the modulating gas valve — the gas valve relay is defective. Press reset and apply burner start; if the fault recurs the gas valve needs replacing |
| 2925 V | Feedback from the modulating gas valve is too low |
| 2927 B | Flame failed during burner operation — open the main shut off valve, shut down the appliance and check the gas line, replace the ionisation electrode, set the burner correctly at minimum rated load, check the integrity of the flue system, check whether the room air supply or ventilation opening is too small, clean the heating block on the flue gas side, or replace the control unit or burner control unit |
| 2946 V | Incorrect code plug detected — the code plug needs replacing |
| 2948 B | No flame signal — with low output the burner starts automatically after cleaning. If the fault occurs repeatedly, the setting of the CO2 valves needs checking |
| 2963 B | Signal from flow and heat exchanger temperature sensor outside the permissible range — the connecting lead needs connecting correctly |
| 2964 B | Flow rate in heat exchanger is too low |
| 2965 B | Flow temperature too high |
| 2966 B | Flow temperature rise in heat exchanger too rapid |
| 2967 B | Flow and heat exchanger temperature sensor differential too great |
| 2970 B | Pressure drop in heating system too rapid |
| 2971 B | System pressure too low — the heating system needs venting, or water needs topping up until the preset pressure is reached. Replace the cable to the pressure sensor, or replace the pressure sensor |
Vaillant
Vaillant fault codes.
Codes for ecoTEC Plus, ecoTEC Pro and ecoFIT models.
ecoTEC Plus Combi Boiler
| Code | What it means |
|---|---|
| F.10 | Flow temperature sensor is experiencing a defect or a short-circuit |
| F.13 | Warm start sensor or cylinder temperature sensor is either not connecting or defective |
| F.22 | Water pressure is too low, or there is an insufficient quantity of water in the product or none at all |
| F.23 | Temperature spread is too great and the water circulation is low |
| F.24 | The temperature has increased too quickly |
| F.25 | The flue gas temperature is too high |
| F.32 | Fan is not connected or is experiencing a defect |
| F.64 | There is a defect with the electronics, safety-relevant sensor or cable |
| F.67 | Flame signal is implausible |
| F.73 | Water pressure sensor is showing that the water pressure inside your boiler is too low |
| F.74 | Water pressure is too high |
| F.84 | Temperature difference is not plausible |
| Communication fault | There is a communication fault between your boiler's PCB and the display |
ecoTEC Pro Combi Boiler
| Code | What it means |
|---|---|
| F.10 | Flow temperature sensor is experiencing a defect or a short-circuit |
| F.13 | Warm start sensor or cylinder temperature sensor is either not connecting or defective |
| F.22 | Water pressure is too low, or there is an insufficient quantity of water in the product or none at all |
| F.23 | Temperature spread is too great and the water circulation is low |
| F.24 | The temperature has increased too quickly |
| F.25 | The flue gas temperature is too high |
| F.32 | Fan is not connected or is experiencing a defect |
| F.64 | There is a defect with the electronics, safety-relevant sensor or cable |
| F.67 | Flame signal is implausible |
| F.73 | Water pressure sensor is showing that the water pressure inside your boiler is too low |
| F.74 | Water pressure is too high |
| F.84 | Temperature difference is not plausible |
| Communication fault | There is a communication fault between your boiler's PCB (inside the electronics box) and the display |
ecoFIT Pure Combi Boiler
| Code | What it means |
|---|---|
| F.10 | Flow temperature sensor fault — short circuit |
| F.22 | Safety switch-off because the water pressure inside the boiler is too low |
| F.28 | Boiler ignition fault — unsuccessful ignition when starting up |
| F.29 | Flame loss fault |
| F.49 | eBus fault — voltage is too low |
| F.65 | Electronics temperature is too high |
| F.71 | Fault with the flow or return temperature sensor |
| F.87 | Fault with electrodes |
| F.88 | Fault with the gas valve |
| F.89 | Fault with the pump |
| Communication | Your boiler's PCB and user interface are not communicating |
ecoTEC Exclusive Green iQ Combi Boiler
| Code | What it means |
|---|---|
| F.10 | Flow sensor has short circuited |
| F.11 | Return sensor has short circuited |
| F.22 | Safety switch-off because boiler water pressure is too low |
| F.32 | Faulty fan |
| F.64 | Electronics or sensor fault |
| F.68 | Fault — the flame signal is unstable |
| F.73 | Water pressure sensor fault |
| F.74 | Water pressure sensor fault |
| F.90 | Communication fault |
ecoTEC Plus System Boiler
| Code | What it means |
|---|---|
| F.10 | Flow temperature sensor is experiencing a defect or a short-circuit |
| F.13 | Warm start sensor or cylinder temperature sensor is either not connecting or defective |
| F.22 | Water pressure is too low, or there is an insufficient quantity of water in the product or none at all |
| F.23 | Temperature spread is too great and the water circulation is low |
| F.24 | The temperature has increased too quickly |
| F.25 | The flue gas temperature is too high |
| F.32 | Fan is not connected or is experiencing a defect |
| F.64 | There is a defect with the electronics, safety-relevant sensor or cable |
| F.67 | Flame signal is implausible |
| F.73 | Water pressure sensor is showing that the water pressure inside your boiler is too low |
| F.74 | Water pressure is too high |
| F.84 | Temperature difference is not plausible |
| Communication fault | There is a communication fault between your boiler's PCB (inside the electronics box) and the display |
ecoTEC Exclusive Green iQ System Boiler
| Code | What it means |
|---|---|
| F.10 | Flow temperature sensor fault — short circuit |
| F.22 | Safety switch-off because the water pressure inside the boiler is too low |
| F.28 | Boiler ignition fault — unsuccessful ignition when starting up |
| F.29 | Flame loss fault |
| F.49 | eBus fault — voltage is too low |
| F.65 | Electronics temperature is too high |
| F.71 | Fault with the flow or return temperature sensor |
| F.87 | Fault with electrodes |
| F.88 | Fault with the gas valve |
| F.89 | Fault with the pump |
| Communication | Your boiler's PCB and user interface are not communicating |
ecoTEC Plus Regular Boiler
| Code | What it means |
|---|---|
| F.00 | Flow temperature sensor fault |
| F.11 | Return temperature sensor short circuit |
| F.29 | Fault — flame loss |
| F.61 | Fault with the gas valve control system |
| F.85 | Temperature sensor fault |
| F.87 | Fault with electrodes |
| F.88 | Fault with the gas valve |
| Communication | Lack of communication between your boiler's PCB and user interface display |
ecoFIT Pure Regular Boiler
| Code | What it means |
|---|---|
| F.10 | Flow NTC has experienced a short circuit |
| F.11 | Return NTC has experienced a short circuit |
| F.22 | Safety switch-off due to low water pressure |
| F.23 | Safety switch-off because the temperature difference is too significant |
| F.24 | Safety switch-off because the temperature is rising too quickly |
| F.28 | Boiler ignition unsuccessful — failure during start-up |
| F.29 | The boiler failed during operation and has failed to re-ignite |
| F.32 | Faulty fan |
| F.61 | Fault with gas valve regulation |
| F.88 | The gas valve is not connected |
| F.89 | An incorrect pump has been detected |
| Con | Lack of communication with the PCB |
Ideal
Ideal fault codes.
Codes for Logic, Vogue and Independent models.
Logic, Logic+, Vogue+ and Mexico
| Code | What it means |
|---|---|
| F1 | Low water pressure |
| F2 | Flame loss |
| F3 | Fan fault |
| F4 / L4 | Flow thermistor |
| F5 / L5 | Return thermistor |
| F6 | Outside sensor failure |
| F7 | Low mains voltage |
| F9 / L9 | Unconfigured PCB |
| L1 | Flow temperature too high, or no water flow |
| L2 | Ignition lockout |
| L6 | False flame lockout |
| LC | Five boiler resets in 15 minutes |
| FA | Negative differential flow/return rate |
| FU | Flow/return differential greater than 50°C |
| DU | Diverter valve in mid-position for service |
Glow-worm
Glow-worm fault codes.
Codes for Energy, Ultimate and Betacom models.
Common across the range
| Code | What it means |
|---|---|
| F28 / F1 / F4 | Ignition or flame-detection fault |
| F5 | Over-temperature fault |
| F6 | Central heating flow thermistor fault |
| F7 | Domestic hot water thermistor fault |
| F8 | Tank thermistor fault |
| F25 / F23 | Circulation fault |
| ERR / F12 / F18 | User-interface fault |
Betacom Combi Boiler
| Code | What it means |
|---|---|
| Red LED on | Lockout — low water pressure. Increase pressure to 1.5 bar and reset the boiler |
| Red LED flashing | Overheat — check both overheat stats |
| Yellow LED flashing | Turn the hot water control knob into its temperature range, and the central heating temperature control knob into the reset position |
| Yellow LED on | Flame present on the burner |
| Green LED on | Power present at the boiler |
| Green LED off | No power to boiler — check for 230V into the appliance, and check the fuse on the PCB |
Betacom4 Combi Boiler
| Code | What it means |
|---|---|
| F00 / F10 / F71 | Flow temperature sensor fault |
| F01 / F11 | Return temperature sensor fault |
| F20 | Over-temperature fault |
| F9 / F22 | Low water pressure, or slow ignition temperature rise |
| F26 / F77 | Gas valve fault |
| F27 / F16 | Flame detection fault |
| F29 | Loss of flame during operation |
| F32 | Incorrect air pressure |
| F49 | eBUS voltage fault |
| F61 / F62 / F63 / F64 / F65 / F67 | Main PCB fault |
| F68 | Flame signal fluctuation |
| F70 | Incompatible user interface |
| F72 / F84 | Permanent temperature difference between flow and return sensors |
| F73 / F74 | Pressure sensor fault |
| F76 | Thermal fuse fault |
| F83 | Thermal fuse fault |
| F85 | Flow and return sensor fault |
| F86 | Underfloor heating contact fault |
Betacom C Combi Boiler
| Code | What it means |
|---|---|
| Temp 30 flashing | Central heating thermistor fault |
| Temp 40 flashing | Domestic hot water thermistor fault |
| Temp 50 flashing | Outdoor sensor fault |
| Temp 60 flashing | Low system pressure |
| Temp 70 flashing | Air pressure switch fault |
| Temp 80 flashing | Over-temperature open circuit |
| Temp 90 flashing | Flame or gas failure |
Ultracom 3 (cxi, sxi, hxi, 35)
| Code | What it means |
|---|---|
| F00 / F10 / F71 | Flow sensor fault |
| F01 / F11 | Return sensor fault |
| F20 | Over-temperature fault |
| F26 / F77 | Gas valve fault |
| F27 / F16 | Flame detection fault |
| F29 | Loss of flame during operation |
| F32 | Incorrect air pressure |
| F49 | eBUS voltage fault |
| F61 / F62 / F63 / F64 / F65 / F67 | Main PCB fault |
| F68 | Flame signal fluctuation |
| F70 | Incompatible user interface |
| F72 / F84 | Permanent temperature difference between flow and return sensors |
| F73 / F74 | Pressure sensor fault |
| F76 | Thermal fuse fault |
| F83 | Thermal fuse fault |
| F85 | Flow and return sensor fault |
| F86 | Underfloor heating contact fault |
| F9 / F22 | Low water pressure, or slow ignition temperature rise |
Flexicom (cx, hx, sx, hxi)
| Code | What it means |
|---|---|
| F9 | Water pressure sensor, blocked filter or pump fault |
| F11 | Flow and/or return thermistor fault |
| F13 | PCB memory or sensing fault |
| F14 | Gas valve control defective |
| F15 | eBUS voltage failure |
| F43 | Generic error |
| F70 | Software incompatible |
| F73 | Pump not detected when expected |
| F77 | Condensate pump error, if fitted |
| F24 | Central heating return temperature above 90°C |
| F2 / F3 | Fan or air pressure switch fault |
| F3 | Fan unable to reach ignition speed |
Compact (e and s)
| Code | What it means |
|---|---|
| No hot water | Check the hot water microswitch and external controls (230V on SL) |
| No central heating | Check the hot water microswitch (if the hot water LED is lit) and external controls |
| No central heating, boiler firing | Check the diverter valve motor and cartridge |
| Locks out within 10 seconds | Check the pump prove switch, air pressure switch and overheat stat |
| Poor burner pressure | Adjust burner pressure or ignition pots on the PCB |
Ci Range (plus) and Si Range
| Code | What it means |
|---|---|
| F2 | Fan or air pressure switch fault |
| F3 | Air fault |
| F12 | PCB to display connection fault |
| F13 | Main PCB connection fault |
| F14 | Central heating flow temperature above 95°C |
| F15 | Gas valve stepper motor fault |
| F17 | Supply voltage below 170V |
| F19 | Central heating thermistor unplugged |
| F20 | Software incompatibility |
Xtramax HE
| Code | What it means |
|---|---|
| F24 | Central heating return temperature above 90°C |
| F25 | Maximum temperature rise slope |
| F26 | Maximum delta temperature |
| F13 | PCB memory or sensing fault |
| F14 | Gas valve control defective |
| F15 | eBUS voltage failure |
| F9 / F22 | Low water pressure, or ignition temperature rise too slow |
| F2 / F3 | Fan fault |
| F25 / F23 | Circulation fault |
| F73 | Pump not detected when expected |
| F70 | Software incompatible |
| F77 | Condensate pump error, if fitted |
Xtrafast 96/120 and E1
| Code | What it means |
|---|---|
| F00 | No fault |
| F02 | Airflow fault |
| F05 | Over-temperature |
| F06 | Central heating thermistor or wiring fault |
| F08 | Storage vessel thermistor or wiring fault |
| F09 | System pressure sensor fault |
| F10 | Fan fault |
| F13 | PCB fault |
| F14 | Central heating flow temperature above 97°C |
| F15 | Gas mechanism fault |
| F20 | Communication fault |
Ultracom 35 Store
| Code | What it means |
|---|---|
| F02 / F12 | Hot water temperature sensor fault |
| F03 / F13 / F79 | Storage tank temperature sensor fault |
| F81 | Hot water circuit over-temperature |
Common questions
What people ask about fault codes.
My boiler shows low pressure. Can I fix that myself?
Usually, yes — it is the most common fault there is. The filling loop under the boiler tops the system back up to around 1 to 1.5 bar cold. If it drops again within days you have a leak somewhere, and that is worth finding rather than topping up every week.
Is it safe to keep resetting the boiler?
Once, after a one-off event like a power cut, is reasonable. Repeatedly resetting a boiler that keeps locking out is not — the lockout is a safety function and overriding it repeatedly is how a small fault becomes a dangerous one. If it returns, stop and call someone.
The code is not in these tables. What now?
Check the manual for your exact model, because codes differ between models from the same manufacturer. Or ring us with the make, model and code and we will tell you what you are looking at.
Does a fault code mean I need a new boiler?
Almost never on its own. Most codes point at a single component, and most of those are worth replacing. We will tell you honestly if a boiler is past economic repair rather than quote a replacement by default.
Can I smell gas — what do I do?
Stop reading this, do not touch any electrical switches, open the windows, turn the gas off at the meter if you can reach it safely, get everyone out and call the National Gas Emergency Service on 0800 111 999. That takes priority over any fault code.
Related
If it needs an engineer.
Most codes end in a repair, and most repairs are one visit.
Got a code you cannot clear?
Ring us with the make, model and code and we will tell you what you are dealing with before anyone comes out.