Baxi Boiler Error Codes and Faults: Manufacturer Codes

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Baxi Platinum Error Codes

Listed below are the most common error codes that you might see on your Baxi Platinum combi range of boiler.

Fault Code	Possible Cause
E20	Central heating NTC error
E28	Error with the NTC flue. Possible air pressure switch error. Blocked flue or condensate or wing fault
E50	Hot water NTC error
E110	Thermostat operated safety
E119	Water pressure switch error – Not operated.
E125	Primary circuit error circulation fault
E130	FLue NTC Operation error
E133	Gas supply Error or flame failure
E160	Fan Error / Fan Wiring Error
E193	Pre-circulation error

Baxi EcoBlue Error Codes

Fault Code	Possible Cause
110	Overheated – try bleeding 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	HW Flow Sensor Fault
E78	Water Pressure Sensor Fault
E100	Internal Clock Time Error on PCB
E109	Poor Circulation
110	Overheat – try bleeding your radiators
111	Maximum Limit of Flow Temperature
117	Water pressure too high
118	Water pressure too low
119	System Pressure Low
125	Water circulation fault
127	Legionella 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	Heating flow switch error (Ireland) Pressure Sensor Error (UK)
166	Air Pressure Switch Fault
270	Dry Fire
432	Earth connector error
433	Heat exchanger temperature exceeded (greater than 95 degrees)

 

Baxi 200 / 400 Combi Gas Boiler Error Codes

Fault Code	Possible Cause
H.01 – .00	Loss of communication between gas valve and boiler board. Possible faul in air or gas unit / loose connection to gas valve
H.01 – .05	Difference between the flow and return temperature has exceeded / sensor error / no or insufficient circulation
H.01 – .08	Sensor fault / Flow temperature increasing to fast in heating mode / no or insufficient circulation
H.01 – .14	Maximum flow temperature value exceeded / no or insufficient circulation / no or insufficient circulation ( temporary fault )
H.01 – .18	No circulation of water. No or insufficient circulation. Sensor error.
H.01 – .21	Temporary error- Flow temperature increasing too fast in DHW mode. No or insufficient circulation. Sensor error.
H.02 – .02	Temporary Error – No input of parameters C1/C2. 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 – System water pressure / Water leak on boiler/ Water leak on system.
H.03 -.00	Temporary error with Communication fault / NTC flue sensor error. Sensor not connected or has a bad connection
H.03 – .01	Communication error with the HMI 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. Defective gas/air unit.
E.01 – .12	Requires Reset – Temperature measured by return sensor greater than flow temperature.
E.01 – .17	Requires Reset – No circulation. Sensor fault either not connected or has a bad connection
E.01 – .20	Maximum flue gas temperature reached. No circulation. Sensor fault.
E.02 – .00	Boiler reset – Reset button has been pressed.
E.02 – .07	No or low system water pressure. system pressure less than 0.5bar
E.02 – .16	CSU time-out. PCB damage.
E.02 – .17	loss of communication between gas valve and boiler PCB. 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.
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. Sensor fault.
E.04 – .02	Permanent Fault – Flow temperature sensor open-circuited. Sensor not or badly connected. Bad connection. 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. Sensor fault.
E.04 – .05	Permanent Fault – Flue temperature sensor open-circuited. Sensor not or badly connected. Bad connection. Sensor fault.
E.04 – .06	Permanent Fault – Critical flue gas temperature value reached. No circulation. 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. 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). Defective gas/air unit.
E.04 – .13	Permanent Fault – Fan rotor blocked. Fan seized. Wiring to fan damaged.
E.04 – .17	Permanent Fault – Problem with gas valve. Defective gas/air unit.

Baxi 600 Combi Gas Boiler Error Codes

Listed below are some of the fault codes that could appear on your Baxi 600 combi gas boiler.

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 NTC fault.
E28	Flue NTC fault.
E40	Central heating return NTC fault.
E50	DHW NTC 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	i) Boiler max temperature exceeded for gradient (probable pump jammed or air in the circuit). OR ii) Boiler max temperature exceeded for overtemperature (probable pump jammed or air in the circuit). OR iii) Safety thermostat sensor tripped.
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 NTC sensor fault (s.c.) OR Domestic Hot Water NTC sensor fault (o.c.).
E270	Circulation fault (dry fire).
E317	Wrong power supply electrical frequency (Hz).
E321	Hot water NTC fault.
E384	False flame.
E385	Under voltage.
E430	Water pressure temporary test.
E430 + Flame ‘crossed’	Water pressure test failed.

Error Code E133 and E28

If you’re seeing either of these two error codes on your Baxi boiler, this is due to your condensate pipe being frozen. In the cold winter months this can happen easily as the condensate pipe runs outside. You can fix this issue by thawing out the pipe (if you feel confident to)