Is your Baxi boiler showing error codes or fault lights? Below we have listed common error codes and possible causes.
Baxi Platinum Error Fault Codes
| Fault Code | Possible Cause |
|---|---|
| E20 | Central heating NTC error |
| E28 | Error with the NTC flue, air pressure switch or blocked flue or condensate or wiring |
| E50 | Hot water NTC (Negative Temperature Coefficient) fault |
| E110 | Thermostat operated safety |
| E119 | Water pressure too low |
| E125 | Primary circuit error circulation fault |
| E130 | Flue NTC (Negative Temperature Coefficient) operation error |
| E133 | Gas supply error |
Baxi EcoBlue Error Fault Codes
| Fault Code | Possible Cause |
|---|---|
| 110 | Overheated – bleed your radiators |
| 117 | Water pressure too high |
| 118 | Water pressure too low |
| 125 | Water circulation fault |
| 133 | Safety time to establish flame exceeded |
| E10 | Outdoor sensor error |
| E20 | Central heating thermistor sensor fault |
| E28 | Flue thermistor fault |
| E54 | Domestic hot water (DHW) flow sensor fault |
| E78 | Water pressure sensor fault |
| E100 | Internal clock time error on printed circuit board (PCB) |
| E109 | Poor circulation |
| 110 | Overheat – bleed your radiators |
| 111 | Maximum limit of flow temperature |
| 117 | Water pressure too high |
| 118 | Water pressure too low |
| 119 | System pressure too low |
| 125 | Water circulation fault |
| 127 | Legionella (cause of Legionnaires’ disease) protection temperature not reached |
| 128 | Loss of flame during operation |
| 133 | Safety time to establish flame exceeded |
| 153 | Forced reset unit unlocked |
| 160 | Fan fault |
| 162 | Air pressure switch error |
| 164 | Pressure Sensor Error (UK) – Heating flow switch error (Ireland) |
| 166 | Air pressure switch fault |
| 270 | Dry fire |
| 432 | Earth connector error |
| 433 | Heat exchanger temperature exceeded (greater than 95 degrees) |
EcoBlue Advance / Ecoblue Regular Gas Boiler Flashing Light Error Fault Codes
| Fault Code | Possible Cause |
|---|---|
| 1 green flash | Boiler temperature reached. No action required. |
| 3 green flashes | Temporary flame loss. Boiler will self reset, if fault continues you will see 3 red flashes. |
| 4 green flashes | Communication error between printed circuit board (PCB) and control. Temporary error, will self reset. |
| 5 green flashes | Parameter error on printed circuit board (PCB). Temporary error, will self reset |
| 6 green flashes | Miscellaneous error. Temporary error, will self reset. |
| 1 red flash | Sensor error, temperature fault or flow fault. |
| 2 red flashes | Boiler overheat tripped |
| 3 red flashes | Ignition fault. Boiler has attempted to light 5 times and failed. |
| 4 red flashes | Fan fault |
| 5 red flashes | Parameter storage unit (PSU) error. |
| 6 red flashes | Miscellaneous error. |
Baxi Duo-tec/Megaflo Error Fault Codes
| Fault Code | Possible Cause |
|---|---|
| E10 | Outdoor sensor fault |
| E20 | Central heating thermistor sensor error |
| E28 | Flue thermistor error |
| E110 | Boiler overheat error |
| E119 | Low water pressure error |
| E125 | Primary water circulation error |
| E131 | Flue overheat lockout error |
| E133 | Ignition error |
| E160 / E161 | Fan error |
| E164 | Pressure sensor fault |
| E167 | Printed circuit board (PCB) error |
| E168 | Printed circuit board (PCB) lockout error |
| E193 | Circulation error |
Baxi 200 / 400 Combi Gas Boiler Error Fault Codes
| Fault Code | Possible Cause |
|---|---|
| H.01 – .00 | Loss of communication between gas valve and boiler board. Possible fault in air/gas unit or loose connection to gas valve. |
| H.01 – .05 | Difference between the flow and return temperature is too high, sensor error or insufficient circulation. |
| H.01 – .08 | Sensor fault, flow temperature increasing too fast in heating mode or insufficient circulation. |
| H.01 – .14 | Maximum flow temperature value exceeded or insufficient circulation – temporary fault. |
| H.01 – .18 | No water circulation, insufficient circulation or sensor error. |
| H.01 – .21 | Temporary error – flow temperature increasing too fast in domestic hot water (DHW) mode, insufficient circulation or sensor error. |
| H.02 – .02 | Temporary error – no input of parameters C1/C2. Printed circuit board (PCB) not configured. |
| H.02 – .03 | Temporary error- incorrect configuration settings C1/C2. |
| H.02 – .04 | Temporary error- parameter fault. Incorrect parameters. |
| H.02 – .06 | Temporary error caused by system water pressure, water leak on boiler, water leak on system. |
| H.03 -.00 | Temporary error with communication, negative temperature coefficient thermostat (NTC) or flue sensor. Sensor could also be unconnected or have a bad connection. |
| H.03 – .01 | Communication error with the printed circuit board (PCB) |
| H.03 – .02 | Flame error – no flame during operation. |
| E.00 – .04 | Return temperature sensor open-circuit. Sensor not or badly connected. |
| E.00 – .05 | Return temperature sensor short-circuit. Sensor not connected or badly connected. |
| E.01 – .02 | Temperature measured by return sensor greater than flow sensor. |
| E.01 – .04 | Loss of flame detected 5 times in 24 hours (with burner on). |
| E.01 – .11 | Incorrect fan speed – external draught over the boiler or defective gas/air unit. |
| E.01 – .12 | Requires reset – temperature measured by return sensor greater than flow temperature. |
| E.01 – .17 | Reset the boiler – no circulation, sensor fault either not connected or has a bad connection. |
| E.01 – .20 | Maximum flue gas temperature reached. No circulation or sensor fault. |
| E.02 – .00 | Reset button has been pressed. |
| E.02 – .07 | No or low system water pressure. system pressure less than 0.5bar |
| E.02 – .16 | Permanent fault caused by channel service unit (CSU) time-out or printed circuit board (PCB) damage. |
| E.02 – .17 | Loss of communication between gas valve and boiler printed circuit board (PCB) or fault in air/gas unit. |
| E.02 – .19 | Jumper 1 changed – check position of jumper 1. |
| E.02 – .20 | Jumper 2 changed – check position of jumper 2. |
| E.02 – .21 | Jumper 3 changed – check position of jumper 3. |
| E.02 – .47 | Wiring to external device error. |
| E.02 – .48 | Configuration to external device unsuccessful – check pairing to external device. |
| E.04 – .00 | Gas valve error – gas valve not detected. |
| E.04 – .01 | Flow temperature sensor short-circuited. Sensor not or badly connected, bad connection or sensor fault. |
| E.04 – .02 | Permanent fault. Flow temperature sensor open-circuited, sensor not or badly connected, bad connection or sensor fault. |
| E.04 – .03 | Permanent fault. Critical flow temperature reached, non-existent or insufficient circulation. |
| E.04 – .04 | Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault. |
| E.04 – .05 | Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault. |
| E.04 – .06 | Permanent fault. Critical flue gas temperature value reached, no circulation or sensor fault. |
| E.04 – .08 | Permanent fault. Maximum safe temperature value reached, safety thermostat open-circuited, no circulation, sensor not or badly connected, bad connection or sensor fault. |
| E.04 – .10 | Failure to light (could be gas supply issue). |
| E.04 – .12 | Permanent fault. False flame signal, short-term fluctuation of the mains, ionization current present even though there is no flame, the burner remains very hot (CO2 too high) or defective gas/air unit. |
| E.04 – .13 | Permanent fault. Fan rotor blocked, fan seized or wiring to fan damaged. |
| E.04 – .17 | Permanent fault. Problem with gas valve or defective gas/air unit. |
Baxi 600 Combi Gas Boiler Error Fault Codes
| Fault Code | Possible Cause |
|---|---|
| E09 | Gas valve connection cable. |
| E10 | External probe fault. |
| E12 | Differential water flow switch fault (still open). |
| E13 | Differential water flow switch fault (still closed). |
| E15 | Gas valve command fault. |
| E20 | Central heating negative temperature coefficient (NTC) thermostat fault. |
| E28 | Flue negative temperature coefficient (NTC) thermostat fault. |
| E40 | Central heating return negative temperature coefficient (NTC) thermostat fault. |
| E50 | Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (tank boiler) (s.c.) or DHW NTC sensor fault (tank boiler) (o.c.). |
| E83/E84/E85/E86/E87 | No communication. |
| E109 | Pre-circulation fault. |
| E110 |
|
| E118 | Primary system water pressure too low (< 0.5 bar). |
| E125 | Circulation fault (primary). |
| E128 | Frequent flame failure (12 times). |
| E129 | Safety error for frequently loss of flame with max correction during the ignition during Calibration Function. |
| E130 | Flue thermostat sensor tripped (lockout). |
| E133 | Failure to light (could be a gas supply issue). |
| E134 | Elapsed time gas valve open without gas (short request in a short period) |
| E135 | Interruption of gas supply (internal error). |
| E154 | Flow/return sensor temperature test. |
| E160 | Fan or fan wiring fault. |
| E163 | Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (s.c.) or DHW NTC sensor fault (o.c.). |
| E270 | Circulation fault (dry fire). |
| E317 | Wrong power supply electrical frequency (Hz). |
| E321 | Hot water negative temperature coefficient (NTC) fault. |
| E384 | False flame. |
| E385 | Under voltage. |
| E430 | Water pressure temporary test. |
| E430 + Flame ‘crossed’ | Water pressure test failed. |
Baxi MainEco Error Fault Codes
| Fault Code | Possible Cause |
|---|---|
| 1 Green Flash | Boiler temperature reached – no action required |
| 3 Green Flashes | Temporary flame loss – this is a temporary error, the system should reset on its own |
| 4 Green Flashes | Communication error between printed circuit board (PCB) and Control – this is a temporary error, the system should reset on its own |
| 5 Green Flashes | Parameter error on parameter storage unit (PSU) or printed circuit board (PCB) – this is a temporary error, the system should reset on its own. |
| 6 Green Flashes | Miscellaneous error |
| 1 Red Flash | Sensor error, sensor fault, temperature fault or flow fault – this is a temporary error, the system should reset on it’s own. |
| 2 Red Flashes | Boiler overheat tripped |
| 3 Red Flashes | Ignition fault. Boiler has attempted to light 5 times and failed |
| 4 Red Flashes | Fan Fault |
| 5 Red Flashes | Parameter storage unit (PSU) error |
| 6 Red Flashes | Miscellaneous |
Baxi Avanta Range Error Fault Codes
| Fault Code | Possible Cause |
|---|---|
| E0 | Temperature sensor fault |
| E1 | Overheated – bleed your radiators |
| E2 | Poor circulation – try bleed your radiators |
| E3 | Printed circuit board (PCB) fault |
| E4 | Ignition failure – try bleed your radiators |
| E10 | Poor/No circulation |
| E12 | Printed circuit board (PCB) Fault |
| E13 | Heat exchanger thermal fuse tripped |
| E83 / 84 / 85 / 86 / 87 | Fan fault normally E8 |
Baxi GA Range Error Codes
| Fault Code | Possible Cause |
|---|---|
| E53 | Poor combustion – flue terminal may be blocked |
| E110 | Overheated – try bleeding your radiators |
| E117 | System water pressure high – try bleeding water from your radiators |
| E118 | System water pressure low |
| E125 | Overheat – try bleeding your radiators |
| E133 | Gas supply fault |
| E4 | Ignition failure |
| E09 | Gas valve wiring fault |
| E10 | Outdoor sensor error |
| E15 | Gas valve connection fault |
| E20 | Central heating thermistor sensor fault |
| E28 | Flue thermistor fault |
| E40 | Central heating return thermistor fault |
| E53 | Flue obstruction |
| E55 | Calibration required |
| E78 | Water pressure sensor fault |
| E92 | Combustion test alarm during auto-setting |
| E109 | Poor circulation |
| E110 | Boiler overheat tripped |
| E117 | System pressure high (>2.9 Bar) |
| E118 | System pressure low(< 0.5bar) |
| E125 | Primary water circulation fault |
| E128 | Loss of flame during operation |
| E129 | Loss of flame during calibration |
| E133 | Ignition fault |
| E135 | Internal error |
| E154 | Primary flow fault |
| E160 | Fan fault |
| E270 | Dry fire |
| E317 | Wrong power supply (Hz) |
| E321 | Not water thermistor fault |
| E384 | Flame detected when gas valve off |
| E385 | Low voltage (less than 195v) |
Baxi Solo Error Fault Codes
| Fault Code | Possible Cause |
|---|---|
| FLASH FLASH ON | Fan error |
| FLASH OFF FLASH | Voltage less than 180V |
| FLASH OFF ON | Overheat lockout |
| FLASH ON FLASH | Printed circuit board (PCB) error |
| FLASH ON ON | Printed circuit board (PCB) fault |
| OFF OFF OFF | No power |
| ON FLASH FLASH | Circulation error or dry fire |
| ON FLASH ON | Thermistor error |
| ON OFF FLASH | Live and neutral reversed error |
| ON OFF ON | Ignition lockout error |
| ON ON FLASH | Printed circuit board (PCB) error |
| ON ON ON | Low voltage wiring harness error |