Baxi Boiler Error / Fault Codes

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Baxi Platinum Error Codes

Fault CodePossible Cause
E20Central heating NTC error
E28Error with the NTC (Negative Temperature Coefficient) flue, air pressure switch or blocked flue or condensate
E50Hot water NTC (Negative Temperature Coefficient) error
E110Thermostat operated safety
E119Water pressure switch error – not operated.
E125Primary circuit error circulation fault
E130Flue NTC (Negative Temperature Coefficient) operation error
E133Gas supply error or flame failure
E160Fan or fan wiring error
E193Pre-circulation error

Baxi EcoBlue Error Codes

Fault CodePossible Cause
110Overheated – try bleeding your radiators
117Water pressure too high
118Water pressure too low
125Water circulation fault
133Safety time to establish flame exceeded
E10Outdoor sensor error
E20Central heating thermistor sensor fault
E28Flue thermistor fault
E54Domestic hot water (DHW) flow sensor fault
E78Water pressure sensor fault
E100Internal clock time error on printed circuit board (PCB)
E109Poor circulation
110Overheat – try bleeding your radiators
111Maximum limit of flow temperature
117Water pressure too high
118Water pressure too low
119System pressure too low
125Water circulation fault
127Legionella (cause of Legionnaires’ disease) protection temperature not reached
128Loss of flame during operation
133Safety time to establish flame exceeded
153Forced reset unit unlocked
160Fan fault
162Air pressure switch error
164Pressure Sensor Error (UK) – Heating flow switch error (Ireland)
166Air pressure switch fault
270Dry fire
432Earth connector error
433Heat exchanger temperature exceeded (greater than 95 degrees)

EcoBlue Advance / Ecoblue Regular Gas Boiler Flashing Light Error Codes

Fault CodePossible Cause
1 green flashBoiler temperature reached. No action required.
3 green flashesTemporary flame loss. Boiler will self reset, if fault continues you will see 3 red flashes.
4 green flashesCommunication error between printed circuit board (PCB) and control. Temporary error, will self reset.
5 green flashesParameter error on printed circuit board (PCB). Temporary error, will self reset
6 green flashesMiscellaneous error. Temporary error, will self reset.
1 red flashSensor error, temperature fault or flow fault.
2 red flashesBoiler overheat tripped
3 red flashesIgnition fault. Boiler has attempted to light 5 times and failed.
4 red flashesFan fault
5 red flashesParameter storage unit (PSU) error.
6 red flashesMiscellaneous error.

Baxi 200 / 400 Combi Gas Boiler Error Codes

Fault CodePossible Cause
H.01 – .00Loss of communication between gas valve and boiler board. Possible fault in air/gas unit or loose connection to gas valve.
H.01 – .05Difference between the flow and return temperature is too high, sensor error or insufficient circulation.
H.01 – .08Sensor fault, flow temperature increasing too fast in heating mode or insufficient circulation.
H.01 – .14Maximum flow temperature value exceeded or insufficient circulation – temporary fault.
H.01 – .18No 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 – .02Temporary error – no input of parameters C1/C2. Printed circuit board (PCB) not configured.
H.02 – .03Temporary error- incorrect configuration settings C1/C2.
H.02 – .04Temporary error- parameter fault. Incorrect parameters.
H.02 – .06Temporary error caused by system water pressure, water leak on boiler, water leak on system.
H.03 -.00Temporary 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 – .02Flame error – no flame during operation.
E.00 – .04Return temperature sensor open-circuit. Sensor not or badly connected.
E.00 – .05Return temperature sensor short-circuit. Sensor not connected or badly connected.
E.01 – .02Temperature measured by return sensor greater than flow sensor.
E.01 – .04Loss of flame detected 5 times in 24 hours (with burner on).
E.01 – .11Incorrect fan speed – external draught over the boiler or defective gas/air unit.
E.01 – .12Requires reset – temperature measured by return sensor greater than flow temperature.
E.01 – .17Reset the boiler – no circulation, sensor fault either not connected or has a bad connection.
E.01 – .20Maximum flue gas temperature reached. No circulation or sensor fault.
E.02 – .00Reset button has been pressed.
E.02 – .07No or low system water pressure. system pressure less than 0.5bar
E.02 – .16Permanent fault caused by channel service unit (CSU) time-out or printed circuit board (PCB) damage.
E.02 – .17Loss of communication between gas valve and boiler printed circuit board (PCB) or fault in air/gas unit.
E.02 – .19Jumper 1 changed – check position of jumper 1.
E.02 – .20Jumper 2 changed – check position of jumper 2.
E.02 – .21Jumper 3 changed – check position of jumper 3.
E.02 – .47 Wiring to external device error.
E.02 – .48Configuration to external device unsuccessful – check pairing to external device.
E.04 – .00Gas valve error – gas valve not detected.
E.04 – .01Flow temperature sensor short-circuited. Sensor not or badly connected, bad connection or sensor fault.
E.04 – .02Permanent fault. Flow temperature sensor open-circuited, sensor not or badly connected, bad connection or sensor fault.
E.04 – .03Permanent fault. Critical flow temperature reached, non-existent or insufficient circulation.
E.04 – .04Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault.
E.04 – .05Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault.
E.04 – .06Permanent fault. Critical flue gas temperature value reached, no circulation or sensor fault.
E.04 – .08Permanent fault. Maximum safe temperature value reached, safety thermostat open-circuited, no circulation, sensor not or badly connected, bad connection or sensor fault.
E.04 – .10Failure to light (could be gas supply issue).
E.04 – .12Permanent 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 – .13Permanent fault. Fan rotor blocked, fan seized or wiring to fan damaged.
E.04 – .17Permanent fault. Problem with gas valve or defective gas/air unit.

Baxi 600 Combi Gas Boiler Error Codes

Fault CodePossible Cause
E09Gas valve connection cable.
E10External probe fault.
E12Differential water flow switch fault (still open).
E13Differential water flow switch fault (still closed).
E15Gas valve command fault.
E20Central heating negative temperature coefficient (NTC) thermostat fault.
E28Flue negative temperature coefficient (NTC) thermostat fault.
E40Central heating return negative temperature coefficient (NTC) thermostat fault.
E50Domestic 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/E87No communication.
E109Pre-circulation fault.
E110
  • 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.
E118Primary system water pressure too low (< 0.5 bar).
E125Circulation fault (primary).
E128Frequent flame failure (12 times).
E129Safety error for frequently loss of flame with max correction during the ignition during Calibration Function.
E130Flue thermostat sensor tripped (lockout).
E133Failure to light (could be a gas supply issue).
E134Elapsed time gas valve open without gas
(short request in a short period)
E135Interruption of gas supply (internal error).
E154Flow/return sensor temperature test.
E160Fan or fan wiring fault.
E163Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (s.c.) or DHW NTC sensor fault (o.c.).
E270Circulation fault (dry fire).
E317Wrong power supply electrical frequency (Hz).
E321Hot water negative temperature coefficient (NTC) fault.
E384False flame.
E385Under voltage.
E430Water pressure temporary test.
E430 + Flame ‘crossed’Water pressure test failed.

Baxi MainEco Error Codes

Fault CodePossible Cause
1 Green FlashBoiler temperature reached – no action required
3 Green FlashesTemporary flame loss – this is a temporary error, the system should reset on its own
4 Green FlashesCommunication error between printed circuit board (PCB) and Control – this is a temporary error, the system should reset on its own
5 Green FlashesParameter 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 FlashesMiscellaneous error
1 Red FlashSensor error, sensor fault, temperature fault or flow fault – this is a temporary error, the system should reset on it’s own.
2 Red FlashesBoiler overheat tripped
3 Red FlashesIgnition fault. Boiler has attempted to light 5 times and failed
4 Red FlashesFan Fault
5 Red FlashesParameter storage unit (PSU) error
6 Red FlashesMiscellaneous

Baxi Avanta Range Error Codes

Fault CodePossible Cause
E0Temperature sensor fault
E1Overheated – try bleeding your radiators
E2Poor circulation – try bleeding your radiators
E3Printed circuit board (PCB) fault
E4Ignition failure – try bleeding your radiators
E10Poor/No circulation
E12Printed circuit board (PCB) Fault
E13Heat exchanger thermal fuse tripped
E83 / 84 / 85 / 86 / 87Fan fault normally E8

Baxi Solo Error Codes

Fault CodePossible Cause
FLASH FLASH ONFan error
FLASH OFF FLASHVoltage less than 180V
FLASH OFF ONOverheat lockout
FLASH ON FLASHPrinted circuit board (PCB) error
FLASH ON ONPrinted circuit board (PCB) fault
OFF OFF OFFNo power
ON FLASH FLASHCirculation error or dry fire
ON FLASH ONThermistor error
ON OFF FLASHLive and neutral reversed error
ON OFF ONIgnition lockout error
ON ON FLASHPrinted circuit board (PCB) error
ON ON ONLow voltage wiring harness error
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