Baxi Boiler Error Codes
If you’re experiencing an issue with your Baxi Boiler, use our Baxi Boiler Error Codes section to search by Boiler Make and Error Code to find out what the fault is.
Please enter the model name and error code:
Platinum Boiler Error Codes
Error Code: E20
Possible Cause: Central heating NTC error
Error Code: E28
Possible Cause: Error with the NTC (Negative Temperature Coefficient) flue, air pressure switch or blocked flue or condensate
Error Code: E50
Possible Cause: Hot water NTC (Negative Temperature Coefficient) error
Error Code: E110
Possible Cause: Thermostat operated safety
Error Code: E119
Possible Cause: Water pressure switch error – not operated.
Error Code: E125
Possible Cause: Primary circuit error circulation fault
Error Code: E130
Possible Cause: Flue NTC (Negative Temperature Coefficient) operation error
Error Code: E133
Possible Cause: Gas supply error or flame failure
Error Code: E160
Possible Cause: Fan or fan wiring error
Error Code: E193
Possible Cause: Pre-circulation error
EcoBlue Boiler Error Codes
Error Code: 110
Possible Cause: Overheated – try bleeding your radiators
Error Code: 117
Possible Cause: Water pressure too high
Error Code: 118
Possible Cause: Water pressure too low
Error Code: 125
Possible Cause: Water circulation fault
Error Code: 133
Possible Cause: Safety time to establish flame exceeded
Error Code: E10
Possible Cause: Outdoor sensor error
Error Code: E20
Possible Cause: Central heating thermistor sensor fault
Error Code: E28
Possible Cause: Flue thermistor fault
Error Code: E54
Possible Cause: Domestic hot water (DHW) flow sensor fault
Error Code: E79
Possible Cause: Water pressure sensor fault
Error Code: E100
Possible Cause: Internal clock time error on printed circuit board (PCB)
Error Code: E109
Possible Cause: Poor circulation
Error Code: 110
Possible Cause: Overheat – try bleeding your radiators
Error Code: 111
Possible Cause: Maximum limit of flow temperature
Error Code: 117
Possible Cause: Water pressure too high
Error Code: 118
Possible Cause: Water pressure too low
Error Code: 119
Possible Cause: System pressure too low
Error Code: 125
Possible Cause: Water circulation fault
Error Code: 1277
Possible Cause: Legionella (cause of Legionnaires’ disease) protection temperature not reached
Error Code: 128
Possible Cause: Loss of flame during operation
Error Code: 133
Possible Cause: Safety time to establish flame exceeded
Error Code: 153
Possible Cause: Forced reset unit unlocked
Error Code: 160
Possible Cause: Fan fault
Error Code: 162
Possible Cause: Air pressure switch error
Error Code: 164
Possible Cause: Pressure Sensor Error (UK) – Heating flow switch error (Ireland)
Error Code: 166
Possible Cause: Air pressure switch fault
Error Code: 270
Possible Cause: Dry fire
Error Code: 432
Possible Cause: Earth connector error
Error Code: 433
Possible Cause: Heat exchanger temperature exceeded (greater than 95 degrees)
EcoBlue Advance & EcoBlue Regular Flashing Light Boiler Error Codes
Error Code: 1 green flash
Possible Cause: Boiler temperature reached. No action required.
Error Code: 3 green flashes
Possible Cause: Temporary flame loss. Boiler will self reset, if fault continues you will see 3 red flashes.
Error Code: 4 green flashes
Possible Cause: Communication error between printed circuit board (PCB) and control. Temporary error, will self reset.
Error Code: 5 green flashes
Possible Cause: Parameter error on printed circuit board (PCB). Temporary error, will self reset
Error Code: 6 green flashes
Possible Cause: Miscellaneous error. Temporary error, will self reset.
Error Code: 1 red flash
Possible Cause: Sensor error, temperature fault or flow fault.
Error Code: 2 red flashes
Possible Cause: Boiler overheat tripped
Error Code: 3 red flashes
Possible Cause: Ignition fault. Boiler has attempted to light 5 times and failed.
Error Code: 4 red flashes
Possible Cause: Fan fault
Error Code: 5 red flashes
Possible Cause: Parameter storage unit (PSU) error.
Error Code: 6 red flashes
Possible Cause: Miscellaneous error.
Duo-tec & Megaflo Boiler Error Codes
Error Code: E10
Possible Cause: Outdoor sensor fault
Error Code: E20
Possible Cause: Central heating thermistor sensor error
Error Code: E28
Possible Cause: Flue thermistor error
Error Code: E110
Possible Cause: Boiler overheat error
Error Code: E119
Possible Cause: Low water pressure error
Error Code: E125
Possible Cause: Primary water circulation error
Error Code: E131
Possible Cause: Flue overheat lockout error
Error Code: E133
Possible Cause: Ignition error
Error Code: E160 / E161
Possible Cause: Fan error
Error Code: E164
Possible Cause: Pressure sensor fault
Error Code: E167
Possible Cause: Printed circuit board (PCB) error
Error Code: E168
Possible Cause: Printed circuit board (PCB) lockout error
Error Code: E193
Possible Cause: Circulation error
200 & 400 Combi Boiler Error Codes
Error Code: H.01 – .00
Possible Cause: Loss of communication between gas valve and boiler board. Possible fault in air/gas unit or loose connection to gas valve.
Error Code: H.01 – .05
Possible Cause: Difference between the flow and return temperature is too high, sensor error or insufficient circulation.
Error Code: H.01 – .08
Possible Cause: Sensor fault, flow temperature increasing too fast in heating mode or insufficient circulation.
Error Code: H.01 – .14
Possible Cause: Maximum flow temperature value exceeded or insufficient circulation – temporary fault.
Error Code: H.01 – .18
Possible Cause: No water circulation, insufficient circulation or sensor error.
Error Code: H.01 – .21
Possible Cause: Temporary error – flow temperature increasing too fast in domestic hot water (DHW) mode, insufficient circulation or sensor error.
Error Code: H.02 – .02
Possible Cause: Temporary error – no input of parameters C1/C2. Printed circuit board (PCB) not configured.
Error Code: H.02 – .03
Possible Cause: Temporary error- incorrect configuration settings C1/C2.
Error Code: H.02 – .04
Possible Cause: Temporary error- parameter fault. Incorrect parameters.
Error Code: H.02 – .06
Possible Cause: Temporary error caused by system water pressure, water leak on boiler, water leak on system.
Error Code: H.03 -.00
Possible Cause: Temporary error with communication, negative temperature coefficient thermostat (NTC) or flue sensor. Sensor could also be unconnected or have a bad connection.
Error Code: H.03 – .01
Possible Cause: Communication error with the printed circuit board (PCB)
Error Code: H.03 – .02
Possible Cause: Flame error – no flame during operation.
Error Code: E.00 – .04
Possible Cause: Return temperature sensor open-circuit. Sensor not or badly connected.
Error Code: E.00 – .05
Possible Cause: Return temperature sensor short-circuit. Sensor not connected or badly connected.
Error Code: E.01 – .02
Possible Cause: Temperature measured by return sensor greater than flow sensor.
Error Code: E.01 – .04
Possible Cause: Loss of flame detected 5 times in 24 hours (with burner on).
Error Code: E.01 – .11
Possible Cause: Incorrect fan speed – external draught over the boiler or defective gas/air unit.
Error Code: E.01 – .12
Possible Cause: Requires reset – temperature measured by return sensor greater than flow temperature.
Error Code: E.01 – .17
Possible Cause: Reset the boiler – no circulation, sensor fault either not connected or has a bad connection.
Error Code: E.01 – .20
Possible Cause: Maximum flue gas temperature reached. No circulation or sensor fault.
Error Code: E.02 – .00
Possible Cause: Reset button has been pressed.
Error Code: E.02 – .07
Possible Cause: No or low system water pressure. system pressure less than 0.5bar
Error Code: E.02 – .16
Possible Cause: Permanent fault caused by channel service unit (CSU) time-out or printed circuit board (PCB) damage.
Error Code: E.02 – .17
Possible Cause: Loss of communication between gas valve and boiler printed circuit board (PCB) or fault in air/gas unit.
Error Code: E.02 – .19
Possible Cause: Jumper 1 changed – check position of jumper 1.
Error Code: E.02 – .20
Possible Cause: Jumper 2 changed – check position of jumper 2.
Error Code: E.02 – .21
Possible Cause: Jumper 3 changed – check position of jumper 3.
Error Code: E.02 – .47
Possible Cause: Wiring to external device error.
Error Code: E.02 – .48
Possible Cause: Configuration to external device unsuccessful – check pairing to external device.
Error Code: E.04 – .00
Possible Cause: Gas valve error – gas valve not detected.
Error Code: E.04 – .01
Possible Cause: Flow temperature sensor short-circuited. Sensor not or badly connected, bad connection or sensor fault.
Error Code: E.04 – .02
Possible Cause: Permanent fault. Flow temperature sensor open-circuited, sensor not or badly connected, bad connection or sensor fault.
Error Code: E.04 – .03
Possible Cause: Permanent fault. Critical flow temperature reached, non-existent or insufficient circulation.
Error Code: E.04 – .04
Possible Cause: Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault.
Error Code: E.04 – .05
Possible Cause: Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault.
Error Code: E.04 – .06
Possible Cause: Permanent fault. Critical flue gas temperature value reached, no circulation or sensor fault.
Error Code: E.04 – .08
Possible Cause: Permanent fault. Maximum safe temperature value reached, safety thermostat open-circuited, no circulation, sensor not or badly connected, bad connection or sensor fault.
Error Code: E.04 – .10
Possible Cause: Failure to light (could be gas supply issue).
Error Code: E.04 – .12
Possible Cause: 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.
Error Code: E.04 – .13
Possible Cause: Permanent fault. Fan rotor blocked, fan seized or wiring to fan damaged.
Error Code: E.04 – .17
Possible Cause: Permanent fault. Problem with gas valve or defective gas/air unit.
600 Combi Boiler Error Codes
Error Code: E09
Possible Cause: Gas valve connection cable.
Error Code: E010
Possible Cause: External probe fault.
Error Code: E12
Possible Cause: Differential water flow switch fault (still open).
Error Code: E13
Possible Cause: Differential water flow switch fault (still closed).
Error Code: E15
Possible Cause: Gas valve command fault.
Error Code: E20
Possible Cause: Central heating negative temperature coefficient (NTC) thermostat fault.
Error Code: E28
Possible Cause: Flue negative temperature coefficient (NTC) thermostat fault.
Error Code: E40
Possible Cause: Central heating return negative temperature coefficient (NTC) thermostat fault.
Error Code: E50
Possible Cause: Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (tank boiler) (s.c.) or DHW NTC sensor fault (tank boiler) (o.c.).
Error Code: E83 / E84 / E85 / E86 / E87
Possible Cause: No communication.
Error Code: E109
Possible Cause: Pre-circulation fault.
Error Code: E110
Possible Cause: Boiler max temperature exceeded for gradient (probable pump jammed or air in the circuit
Boiler max temperature exceeded for overtemperature (probable pump jammed or air in the circuit
Safety thermostat sensor tripped.
Error Code: E118
Possible Cause: Primary system water pressure too low (< 0.5 bar).
Error Code: E125
Possible Cause: Circulation fault (primary).
Error Code: E128
Possible Cause: Frequent flame failure (12 times).
Error Code: E129
Possible Cause: Safety error for frequently loss of flame with max correction during the ignition during Calibration Function.
Error Code: E130
Possible Cause: Flue thermostat sensor tripped (lockout).
Error Code: E133
Possible Cause: Failure to light (could be a gas supply issue).
Error Code: E134
Possible Cause: Elapsed time gas valve open without gas (short request in a short period)
Error Code: E135
Possible Cause: Interruption of gas supply (internal error).
Error Code: E154
Possible Cause: Flow/return sensor temperature test.
Error Code: E160
Possible Cause: Fan or fan wiring fault.
Error Code: E163
Possible Cause: Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (s.c.) or DHW NTC sensor fault (o.c.).
Error Code: E270
Possible Cause: Circulation fault (dry fire).
Error Code: E317
Possible Cause: Wrong power supply electrical frequency (Hz).
Error Code: E321
Possible Cause: Hot water negative temperature coefficient (NTC) fault.
Error Code: E384
Possible Cause: False flame.
Error Code: E385
Possible Cause: Under voltage.
Error Code: E430
Possible Cause: Water pressure temporary test.
Error Code: E430 + Flame Crossed
Possible Cause: Water pressure test failed.
MainEco Boiler Error Codes
Error Code: 1 Green Flash
Possible Cause: Boiler temperature reached – no action required
Error Code: 3 Green Flashes
Possible Cause: Temporary flame loss – this is a temporary error, the system should reset on its own
Error Code: 4 Green Flashes
Possible Cause: Communication error between printed circuit board (PCB) and Control – this is a temporary error, the system should reset on its own
Error Code: 5 Green Flashes
Possible Cause: Parameter error on parameter storage unit (PSU) or printed circuit board (PCB) – this is a temporary error, the system should reset on its own.
Error Code: 6 Green Flashes
Possible Cause: Miscellaneous error
Error Code: 1 Red Flash
Possible Cause: Sensor error, sensor fault, temperature fault or flow fault – this is a temporary error, the system should reset on it’s own.
Error Code: 2 Red Flashes
Possible Cause: Boiler overheat tripped
Error Code: 3 Red Flashes
Possible Cause: Ignition fault. Boiler has attempted to light 5 times and failed
Error Code: 4 Red Flashes
Possible Cause: Fan Fault
Error Code: 5 Red Flashes
Possible Cause: Parameter storage unit (PSU) error
Error Code: 6 Red Flashes
Possible Cause: Miscellaneous
Avanta Boiler Error Codes
Error Code: E0
Possible Cause: Temperature sensor fault
Error Code: E1
Possible Cause: Overheated – try bleeding your radiators
Error Code: E2
Possible Cause: Poor circulation – try bleeding your radiators
Error Code: E3
Possible Cause: Printed circuit board (PCB) fault
Error Code: E4
Possible Cause: Ignition failure – try bleeding your radiators
Error Code: E10
Possible Cause: Poor/No circulation
Error Code: E12
Possible Cause: Printed circuit board (PCB) Fault
Error Code: E13
Possible Cause: Heat exchanger thermal fuse tripped
Error Code: E83 / 84 / 85 / 86 / 87
Possible Cause: Fan fault normally E8
GA Range Boiler Error Codes
Error Code: E53
Possible Cause: Poor combustion – flue terminal may be blocked
Error Code: E110
Possible Cause: Overheated – try bleeding your radiators
Error Code: E117
Possible Cause: System water pressure high – try bleeding water from your radiators
Error Code: E118
Possible Cause: System water pressure low
Error Code: E125
Possible Cause: Overheat – try bleeding your radiators
Error Code: E133
Possible Cause: Gas supply fault
Error Code: E4
Possible Cause: Ignition failure
Error Code: E09
Possible Cause: Gas valve wiring fault
Error Code: E10
Possible Cause: Outdoor sensor error
Error Code: E15
Possible Cause: Gas valve connection fault
Error Code: E20
Possible Cause: Central heating thermistor sensor fault
Error Code: E28
Possible Cause: Flue thermistor fault
Error Code: E40
Possible Cause: Central heating return thermistor fault
Error Code: E53
Possible Cause: Flue obstruction
Error Code: E55
Possible Cause: Calibration required
Error Code: E78
Possible Cause: Water pressure sensor fault
Error Code: E92
Possible Cause: Combustion test alarm during auto-setting
Error Code: E109
Possible Cause: Poor circulation
Error Code: E110
Possible Cause: Boiler overheat tripped
Error Code: E117
Possible Cause: System pressure high (>2.9 Bar)
Error Code: E118
Possible Cause: System pressure low(< 0.5bar)
Error Code: E125
Possible Cause: Primary water circulation fault
Error Code: E128
Possible Cause: Loss of flame during operation
Error Code: E129
Possible Cause: Loss of flame during calibration
Error Code: E133
Possible Cause: Ignition fault
Error Code: E135
Possible Cause: Internal error
Error Code: E154
Possible Cause: Primary flow fault
Error Code: E160
Possible Cause: Fan fault
Error Code: E270
Possible Cause: Dry fire
Error Code: E317
Possible Cause: Wrong power supply (Hz)
Error Code: E321
Possible Cause: Not water thermistor fault
Error Code: E384
Possible Cause: Flame detected when gas valve off
Error Code: E385
Possible Cause: Low voltage (less than 195v)
Baxi Solo Boiler Error Codes
Error Code: Flash - Flash - ON
Possible Cause: Fan error
Error Code: Flash - Off - Flash
Possible Cause: Voltage less than 180V
Error Code: Flash - Off - On
Possible Cause: Overheat lockout
Error Code: Flash - On - Flash
Possible Cause: Printed circuit board (PCB) error
Error Code: Flash - On - On
Possible Cause: Printed circuit board (PCB) fault
Error Code: Off - Off - Off
Possible Cause: No power
Error Code: On - Flash - Flash
Possible Cause: Circulation error or dry fire
Error Code: On - Flash - On
Possible Cause: Thermistor error
Error Code: On - Off - Flash
Possible Cause: Live and neutral reversed error
Error Code: On - Off - On
Possible Cause: Ignition lockout error
Error Code: On - On - Flash
Possible Cause: Printed circuit board (PCB) error