Diagnose Common Boiler Fault Codes Quickly
If your boiler has suddenly stopped working and you’re staring at a confusing error code on the display, you’re not alone. Most modern boilers show a fault code when something goes wrong – but knowing what it means (and what to do next) isn’t always easy.
This page helps you look up the most common boiler error codes across popular UK brands like Worcester Bosch, Vaillant, Ideal and Glow-worm.
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Click on your boiler brand below to expand a list of the most common error and fault codes.
🔎 Don’t see your boiler brand listed? Contact us for help – we’ll do our best to guide you.
| Fault Code | Description |
| 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 |
| Fault Code | Description |
| T1 | Ignition test |
| T2 | Fan test |
| T3 | Pump test |
| T4 | Three way valve test |
| T6 | Ionisation oscillator test |
| 9A 362 error | 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 | Gas valve leak |
| 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 hour |
| 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 & Return |
| NO CODE 212 | Safety or flow temperature rising too fast |
| Fault Code | Description |
| B1 | Code plug not detected |
| C6 | Fan speed to low or too high |
| E2 | Central heating (CH) flow negative thermistor coefficient (NTC) sensor defective |
| E9 | Safety temperature limiter in central heating (CH) 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 |
| Fault Code | Description |
| T1 | Ignition test |
| T2 | Fan test |
| T3 | Pump test |
| T4 | Three-way valve test |
| T6 | Ionisation oscillator test |
| 9A 362 error | 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 | Gas valve leak |
| 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 hour |
| 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 & Return |
| NO CODE 212 | Safety or flow temperature rising too fast |
| Fault Code | Description |
| A1 | Water is leaking or the pump needs replacing or freeing due to the pump running dry |
| A7 | The hot water negative thermistor coefficient (NTC) sensor is defective – the hot water sensor or connecting leads need checking |
| A8 | Break 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 (CH) water flow negative thermistor coefficient (NTC) sensor defective check CH flow NTC sensor and connection leads |
| E9 | Safety temperature limiter in central heating (CH) flow has tripped the system pressure or safety temperature limiter needs checking |
| EA | Flame not detected due to a gas issue – the gas supply, power supply or igniter, electrode and lead need checking – contact a Gas Safe installer |
| FO | 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 – hire a Gas Safe installer |
| FD | Reset button pressed by mistake – press reset button again |
| Fault Code | Description |
| A1 | Pump dry run detection or pump is running in the air the system pressure needs checking |
| A5 | Tank negative thermistor coefficient (NTC) defect |
| A7 | Domestic hot water (DHW) negative thermistor coefficient (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 negative thermistor coefficient (NTC) defect |
| E9 | Safety temperature limiter in central heating (CH) 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 |
| Fault Code | Description |
| 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 if a correct code plug is installed and exchange or reconnect code plug |
| 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 isn’t connected or damaged – connect the cable for the EMS-Bus or replace the damaged cable exchange 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 to the hot water temperature sensor correctly, mount the hot water temperature sensor correctly or replace the hot water temperature sensor |
| 1037 W | Outside temperature sensor is defective – check the connecting lead |
| 1065 B | Pressure sensor defective or not connected – check 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 to the flow temperature sensor correctly or temperature sensor could need replacing |
| 1075 W | Short circuit of the temperature sensor at the heating block – temperature sensor may need replacing |
| 1076 W | No signal from the temperature sensor at the heating block available – replace the temperature 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 the reset button and apply burner start, wait to see if fault reoccurs, if it does 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 gas line, replace the ionisation electrode, set burner correctly and minimum rated load, check the integrity flue system and if the interconnected room air supply is too small, or the size of the ventilation opening is too small, clean the heating block on the flue gas side or replace the control unit/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 need 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 / 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 replace the pressure sensor |
| Fault Code | Description |
| F.10 Short circuit: flow sensor | Flow temperature sensor is experiencing a defect or a short-circuit |
| F.13 Short circuit: Cylinder sensor | Warm start sensor/cylinder temperature sensor is either not connecting or defective |
| F.23 Safety switch-off: Temp. spread too large | Temperature spread is too great and the water circulation is low |
| F.22 Safety switch-off: Low water pressure | Water pressure is too low or there is either an insufficient quantity of water in the product or none at all |
| F.24 Safety switch-off: Temp. increase too fast | The temperature has increased too quickly |
| F.25 Safety switch-off: Flue temp too high | The flue gas temperature is too high |
| F.32 Fault: Fan | Fan isn’t connected or is experiencing a defect |
| F.64 Fault: Electronics/sensor | There is a defect with the electronics, safety-relevant sensor or cable |
| F.67 Fault: Electronics/flame | Flame signal is implausible |
| F.73 Fault: Water pres. sensor (signal too weak) | Water pressure sensor is showing that the water pressure inside your boiler is too low |
| F.74 Fault: Water pres. sensor (signal too strong) | Water pressure is too high |
| F.84 Fault: NTCs temp. difference implausible | Temperature difference isn’t plausible |
| Communication fault | There is a communication fault occurring between your boiler’s PCB and the display. |
| Fault Code | Description |
| F.10 Short circuit: flow sensor | Flow temperature sensor is experiencing a defect or a short-circuit |
| F.13 Short circuit: Cylinder sensor | Warm start sensor/cylinder temperature sensor is either not connecting or defective |
| F.22 Safety switch-off: Low water pressure | Water pressure is too low or there is either an insufficient quantity of water in the product or none at all |
| F.23 Safety switch-off: Temp. spread too large | Temperature spread is too great and the water circulation is low |
| F.24 Safety switch-off: Temp. increase too fast | The temperature has increased too quickly |
| F.25 Safety switch-off: Flue temp too high | The flue gas temperature is too high |
| F.32 Fault: Fan | Fan isn’t connected or is experiencing a defect |
| F.64 Fault: Electronics/sensor | There is a defect with the electronics, safety-relevant sensor or cable |
| F.67 Fault: Electronics/flame | Flame signal is implausible |
| F.73 Fault: Water pres. sensor (signal too weak) | Water pressure sensor is showing that the water pressure inside your boiler is too low |
| F.74 Fault: Water pres. sensor (signal too strong) | Water pressure is too high |
| F.84 Fault: NTCs temp. difference implausible | Temperature difference isn’t plausible |
| Communication fault: | There is a communication fault occurring between your boiler’s PCB (inside the electronics box) and the display. |
| Fault Code | Description |
| 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 (fault) |
| F.71 | Fault with the flow/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 |
| Fault Code | Description |
| 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/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 |
| Fault Code | Description |
| F.10 Short circuit: flow sensor | Flow temperature sensor is experiencing a defect or a short-circuit |
| F.13 Short circuit: Cylinder sensor | Warm start sensor/cylinder temperature sensor is either not connecting or defective |
| F.22 Safety switch-off: Low water pressure | Water pressure is too low or there is either an insufficient quantity of water in the product or none at all |
| F.23 Safety switch-off: Temp. spread too large | Temperature spread is too great and the water circulation is low |
| F.24 Safety switch-off: Temp. increase too fast | The temperature has increased too quickly |
| F.25 Safety switch-off: Flue temp too high | The flue gas temperature is too high |
| F.32 Fault: Fan | Fan isn’t connected or is experiencing a defect |
| F.64 Fault: Electronics/sensor | There is a defect with the electronics, safety-relevant sensor or cable |
| F.67 Fault: Electronics/flame | Flame signal is implausible |
| F.73 Fault: Water pres. sensor (signal too weak) | Water pressure sensor is showing that the water pressure inside your boiler is too low |
| F.74 Fault: Water pres. sensor (signal too strong) | Water pressure is too high |
| F.84 Fault: NTCs temp. difference implausible | Temperature difference isn’t plausible |
| Communication fault: | There is a communication fault occurring between your boiler’s PCB (inside the electronics box) and the display. |
| Fault Code | Description |
| 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 (fault) |
| F.71 | Fault with the flow/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 |
| Fault Code | Description |
| 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 |
| Fault Code | Description |
| 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 option and it has failed to re-ignite |
| F.32 | Faulty fan |
| F.61 | Fault with gas valve regulation |
| F.88 | The gas valve isn’t connected |
| F.89 | An incorrect pump has been detected |
| Con | Lack of communication with the PCB |
| Fault Code | Description |
|---|---|
| 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 temp too high or no water flow |
| L2 | Ignition lockout |
| L6 | False flame lockout |
| LC | 5 boiler resets in 15 minutes |
| FA | Negative differential flow/return rate |
| FU | Flow/return differential > 50°C |
| DU | Diverter valve in mid-position for service |
| Fault Code(s) | Description |
|---|---|
| F28 / F1 / F4 | Ignition / flame‑detection fault |
| F5 | Over‑temperature fault |
| F6 | CH flow thermistor fault |
| F7 | DHW thermistor fault |
| F8 | Tank thermistor fault |
| F25 / F23 | Circulation fault |
| ERR / F12 / F18 | User‑interface fault |
| Fault Code | Description |
|---|---|
| Red LED On | Lockout – low water pressure (increase pressure to 1.5bar) and reset boiler |
| Red LED flashing | Overheat – check both overheat stats |
| Yellow LED flashing | Turn domestic hot water (DHW) control knob into temperature range and turn central heating (CH) temperature control knob into power (reset position) |
| Yellow LED on | Flame present on the burner |
| Green LED on | Green LED on |
| Green LED off | No power to boiler – Check for 230volts into the appliance, check the fuse on printed circuit board (PCB) |
| Fault Code(s) | Description |
|---|---|
| F00 / F10 / F71 | Flow‑temperature sensor fault |
| F01 / F11 | Return‑temperature sensor fault |
| F20 | Over‑temperature fault |
| F9 / F22 | Low water pressure / 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 ΔT between flow & return sensors |
| F73 / F74 | Pressure‑sensor fault |
| F76 | Thermal‑fuse fault |
| F83 | Thermal‑fuse fault |
| F85 | Flow & return sensor fault |
| F86 | Under‑floor‑heating contact fault |
| Fault Code(s) | Description |
|---|---|
| Temp 30 flashing | CH thermistor fault |
| Temp 40 flashing | DHW 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 |
| Fault Code(s) | Description |
|---|---|
| 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 ΔT between flow & return sensors |
| F73 / F74 | Pressure‑sensor fault |
| F76 | Thermal‑fuse fault |
| F83 | Thermal‑fuse fault |
| F85 | Flow & return sensor fault |
| F86 | Under‑floor‑heating contact fault |
| F9 / F22 | Low water pressure / slow ignition temperature rise |
| Fault Code(s) | Description |
|---|---|
| F9 | Water‑pressure‑sensor / blocked filter / 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 | CH return temperature > 90 °C |
| F2 / F3 | Fan / air‑pressure‑switch fault |
| F3 | Fan unable to reach ignition speed |
| Fault Code(s) | Description |
|---|---|
| No DHW | Check DHW microswitch & external controls (230 V on SL) |
| No CH | Check DHW microswitch (if DHW LED lit) & external controls |
| No CH, boiler firing | Check diverter‑valve motor & cartridge |
| Locks out ≤ 10 s | Check pump‑prove switch, air‑pressure switch & over‑heat stat |
| Poor burner pressure | Adjust burner pressure / ignition pots on PCB |
| Fault Code(s) | Description |
|---|---|
| F2 (Ci/Si) | Fan / air‑pressure‑switch fault |
| F3 (Ci) | Air fault |
| F12 | PCB–display connection fault |
| F13 | Main‑PCB connection fault |
| F14 | CH flow temp > 95 °C |
| F15 | Gas‑valve stepper‑motor fault |
| F17 | Supply voltage < 170 V |
| F19 | CH thermistor unplugged |
| F20 | Software incompatibility |
| Fault Code(s) | Description |
|---|---|
| F24 | CH return temperature > 90 °C |
| F25 | Maximum temperature‑rise slope |
| F26 | Maximum delta‑temperature |
| F13 | PCB memory / sensing fault |
| F14 | Gas‑valve control defective |
| F15 | eBUS voltage failure |
| F9 / F22 | Low water pressure / 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 (optional) |
| Fault Code(s) | Description |
|---|---|
| F00 | No fault |
| F02 | Air‑flow fault |
| F05 | Over‑temperature |
| F06 | CH thermistor / wiring fault |
| F08 | Storage‑vessel thermistor / wiring fault |
| F09 | System‑pressure sensor fault |
| F10 | Fan fault |
| F13 | PCB fault |
| F14 | CH flow temperature > 97 °C |
| F15 | Gas‑mechanism fault |
| F20 | Communication fault |
| Fault Code(s) | Description |
|---|---|
| F02 / F12 | Hot‑water temperature‑sensor fault |
| F03 / F13 / F79 | Storage‑tank temperature‑sensor fault |
| F81 | Hot‑water‑circuit over‑temperature |
❗Important: Some issues are easy to fix (like low pressure), while others need a qualified Gas Safe engineer. If you’re in Colchester or nearby, contact GH Heating today for fast, professional help & advice.
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