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Baxi boiler error codes & fault codes. What do you need to do?

Last updated on: 28 October 2024

Baxi boiler error codes & fault codes. What do you need to do?

Boilers can fail at any time, causing worry and tension at the most inconvenient times. Before calling an expert, you can use the fault code guide below to help with troubleshooting and able to determine the next best steps with your boiler, such as resolving the issue yourself looking for a repair or replacement entirely.

When you’re having problems, having a reputable boiler, such as a Baxi boiler, can help. So, here are some Baxi boiler error codes. Let’s start with the most common codes encountered by our skilled heating engineers.

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BAXI 200 COMBI / BAXI 400 COMBI Boiler Error/Fault Codes

Error Code	Possible Fault
H.01 – .00	Temporary Fault – Temporary loss of communication between the gas valve and boiler board. Fault in air/gas unit. Loose connection to the gas valve.
H.01 – .05	Temporary Fault – Maximum difference between the flow and return temperature exceeded. Non-existent or insufficient circulation. Sensor error.
H.01 – .08	Temporary Fault – Flow temperature increasing too fast in heating mode. Non-existent or insufficient circulation. Sensor error.
H.01 – .14	Temporary Fault – Maximum flow temperature value exceeded. Non-existent or insufficient circulation. Non-existent or insufficient circulation.
H.01 – .18	Temporary Fault – No circulation of water. Non-existent or insufficient circulation. Sensor error.
H.01 – .21	Temporary Fault – Flow temperature increasing too fast in DHW mode. Non-existent or insufficient circulation. Sensor error.
H.02 – .02	Temporary Fault – No input of parameters C1/C2. PCB not configured.
H.02 – .03	Temporary Fault- Incorrect configuration settings C1/C2.
H.02 – .04	Temporary Fault – Parameter error. Incorrect parameters.
H.02 – .06	Temporary Fault – System water pressure. Water leak on the boiler. Water leak on the system.
H.03 -.00	Temporary Fault – Communication error with NTC flue sensor. Sensor not, or badly connected. Bad connection. Sensor fault.
H.03 -.01	Temporary Fault – Communication error with the HMI PCB. HMI is not connected.
H.03 -.02	Temporary Fault – No flame during operation. No ionisation current.
E.00 – .04	Permanent Fault – Return temperature sensor open-circuit. Sensor not or badly connected. Bad connection. Sensor fault.
E.00 – .05	Permanent Fault – Return temperature sensor open-circuit. Sensor not or badly connected. Bad connection. Sensor fault.
E.01 – .02	Permanent Fault – Temperature measured by return sensor greater than flow sensor. Bad connection. Sensor fault. Sensor not or badly connected.
E.01 – .04	Permanent Fault – Loss of flame detected 5 times in 24 hours (Burner on). No ionisation current.
E.01 – .11	Permanent Fault Requiring Reset – Incorrect fan speed. External draught over the boiler. Defective gas/air unit.
E.01 – .12	Permanent Fault Requiring Reset – Temperature measured by return sensor greater than flow temperature.
E.01 – .17	Permanent Fault Requiring Reset – No circulation. Sensor not or badly connected. Sensor fault.
E.01 – .20	Permanent Fault – Maximum flue gas temperature value reached (>140 Deg C). No circulation. Sensor fault.
E.02 – .00	Permanent Fault – Boiler reset in progress. The reset button has been pressed.
E.02 – .07	No or low system water pressure. Low system pressure (less than 0.5bar) boiler will not function.
E.02 – .16	Permanent Fault – Onboard CSU time-out. Check PCB for damage.
E.02 – .17	Permanent Fault – Permanent loss of communication between the gas valve and boiler PCB. Fault in air/gas unit. Loose connection to the gas valve.
E.02 – .19	Permanent Fault – Jumper 1 changed. Check the position of jumper 1.
E.02 – .20	Permanent Fault – Jumper 2 changed. Check the position of the jumper 2.
E.02 – .21	Permanent Fault – Jumper 3 changed. Check the position of the jumper 3.
E.02 – .47	Permanent Fault – Connection to external device unsuccessful. Check to wire to an external device.
E.02 – .48	Permanent Fault – Configuration to external device unsuccessful. Check to pair to external.
E.04 – .00	Permanent Fault – Gas valve fault. Gas valve not detected.
E.04 – .01	Permanent Fault – 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 presents 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 the gas valve. Defective gas/air unit.

BAXI 200 COMBI / BAXI 400 COMBI Boiler Error/Fault Codes

Error Code	Possible Fault
H.01 – .00	Temporary Fault – Temporary loss of communication between the gas valve and boiler board. Fault in air/gas unit. Loose connection to the gas valve.
H.01 – .05	Temporary Fault – Maximum difference between the flow and return temperature exceeded. Non-existent or insufficient circulation. Sensor error.
H.01 – .08	Temporary Fault – Flow temperature increasing too fast in heating mode. Non-existent or insufficient circulation. Sensor error.
H.01 – .14	Temporary Fault – Maximum flow temperature value exceeded. Non-existent or insufficient circulation. Non-existent or insufficient circulation.
H.01 – .18	Temporary Fault – No circulation of water. Non-existent or insufficient circulation. Sensor error.
H.01 – .21	Temporary Fault – Flow temperature increasing too fast in DHW mode. Non-existent or insufficient circulation. Sensor error.
H.02 – .02	Temporary Fault – No input of parameters C1/C2. PCB not configured.
H.02 – .03	Temporary Fault- Incorrect configuration settings C1/C2.
H.02 – .04	Temporary Fault – Parameter error. Incorrect parameters.
H.02 – .06	Temporary Fault – System water pressure. Water leak on the boiler. Water leak on the system.
H.03 -.00	Temporary Fault – Communication error with NTC flue sensor. Sensor not, or badly connected. Bad connection. Sensor fault.
H.03 -.01	Temporary Fault – Communication error with the HMI PCB. HMI is not connected.
H.03 -.02	Temporary Fault – No flame during operation. No ionisation current.
E.00 – .04	Permanent Fault – Return temperature sensor open-circuit. Sensor not or badly connected. Bad connection. Sensor fault.
E.00 – .05	Permanent Fault – Return temperature sensor open-circuit. Sensor not or badly connected. Bad connection. Sensor fault.
E.01 – .02	Permanent Fault – Temperature measured by return sensor greater than flow sensor. Bad connection. Sensor fault. Sensor not or badly connected.
E.01 – .04	Permanent Fault – Loss of flame detected 5 times in 24 hours (Burner on). No ionisation current.
E.01 – .11	Permanent Fault Requiring Reset – Incorrect fan speed. External draught over the boiler. Defective gas/air unit.
E.01 – .12	Permanent Fault Requiring Reset – Temperature measured by return sensor greater than flow temperature.
E.01 – .17	Permanent Fault Requiring Reset – No circulation. Sensor not or badly connected. Sensor fault.
E.01 – .20	Permanent Fault – Maximum flue gas temperature value reached (>140 Deg C). No circulation. Sensor fault.
E.02 – .00	Permanent Fault – Boiler reset in progress. The reset button has been pressed.
E.02 – .07	No or low system water pressure. Low system pressure (less than 0.5bar) boiler will not function.
E.02 – .16	Permanent Fault – Onboard CSU time-out. Check PCB for damage.
E.02 – .17	Permanent Fault – Permanent loss of communication between the gas valve and boiler PCB. Fault in air/gas unit. Loose connection to the gas valve.
E.02 – .19	Permanent Fault – Jumper 1 changed. Check the position of jumper 1.
E.02 – .20	Permanent Fault – Jumper 2 changed. Check the position of the jumper 2.
E.02 – .21	Permanent Fault – Jumper 3 changed. Check the position of the jumper 3.
E.02 – .47	Permanent Fault – Connection to external device unsuccessful. Check to wire to an external device.
E.02 – .48	Permanent Fault – Configuration to external device unsuccessful. Check to pair to external.
E.04 – .00	Permanent Fault – Gas valve fault. Gas valve not detected.
E.04 – .01	Permanent Fault – 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 presents 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 the gas valve. Defective gas/air unit.

BAXI 600 COMBI / BAXI 800 COMBI Boiler Error/Fault Codes

Error Code	Possible Fault
H.01 – .00	Temporary Fault – Temporary loss of communication between the gas valve and boiler board. Fault in air/gas unit. Loose connection to the gas valve.
H.01 – .05	Temporary Fault – Maximum difference between the flow and return temperature exceeded. Non-existent or insufficient circulation. Sensor error.
H.01 – .08	Temporary Fault – Flow temperature increasing too fast in heating mode. Non-existent or insufficient circulation. Sensor error.
H.01 – .14	Temporary Fault – Maximum flow temperature value exceeded. Non-existent or insufficient circulation. Non-existent or insufficient circulation.
H.01 – .18	Temporary Fault – No circulation of water. Non-existent or insufficient circulation. Sensor error.
H.01 – .21	Temporary Fault – Flow temperature increasing too fast in DHW mode. Non-existent or insufficient circulation. Sensor error.
H.02 – .02	Temporary Fault – No input of parameters C1/C2. PCB not configured.
H.02 – .03	Temporary Fault- Incorrect configuration settings C1/C2.
H.02 – .04	Temporary Fault – Parameter error. Incorrect parameters.
H.02 – .06	Temporary Fault – System water pressure. Water leak on the boiler. Water leak on the system.
H.03 -.00	Temporary Fault – Communication error with NTC flue sensor. Sensor not, or badly connected. Bad connection. Sensor fault.
H.03 -.01	Temporary Fault – Communication error with the HMI PCB. HMI is not connected.
H.03 -.02	Temporary Fault – No flame during operation. No ionisation current.
E.00 – .04	Permanent Fault – Return temperature sensor open-circuit. Sensor not or badly connected. Bad connection. Sensor fault.
E.00 – .05	Permanent Fault – Return temperature sensor open-circuit. Sensor not or badly connected. Bad connection. Sensor fault.
E.01 – .02	Permanent Fault – Temperature measured by return sensor greater than flow sensor. Bad connection. Sensor fault. Sensor not or badly connected.
E.01 – .04	Permanent Fault – Loss of flame detected 5 times in 24 hours (Burner on). No ionisation current.
E.01 – .11	Permanent Fault Requiring Reset – Incorrect fan speed. External draught over the boiler. Defective gas/air unit.
E.01 – .12	Permanent Fault Requiring Reset – Temperature measured by return sensor greater than flow temperature.
E.01 – .17	Permanent Fault Requiring Reset – No circulation. Sensor not or badly connected. Sensor fault.
E.01 – .20	Permanent Fault – Maximum flue gas temperature value reached (>140 Deg C). No circulation. Sensor fault.
E.02 – .00	Permanent Fault – Boiler reset in progress. The reset button has been pressed.
E.02 – .07	No or low system water pressure. Low system pressure (less than 0.5bar) boiler will not function.
E.02 – .16	Permanent Fault – Onboard CSU time-out. Check PCB for damage.
E.02 – .17	Permanent Fault – Permanent loss of communication between the gas valve and boiler PCB. Fault in air/gas unit. Loose connection to the gas valve.
E.02 – .19	Permanent Fault – Jumper 1 changed. Check the position of jumper 1.
E.02 – .20	Permanent Fault – Jumper 2 changed. Check the position of the jumper 2.
E.02 – .21	Permanent Fault – Jumper 3 changed. Check the position of the jumper 3.
E.02 – .47	Permanent Fault – Connection to external device unsuccessful. Check to wire to an external device.
E.02 – .48	Permanent Fault – Configuration to external device unsuccessful. Check to pair to external.
E.04 – .00	Permanent Fault – Gas valve fault. Gas valve not detected.
E.04 – .01	Permanent Fault – 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 presents 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 the gas valve. Defective gas/air unit.

Error Code	Possible Fault
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 frequent 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.

BAXI 600 HEAT / MAIN ECO COMPACT HEAT Boiler Error/Fault Codes

Error Code	Possible Fault
E20	Central heating NTC fault
E28	Flue NTC fault, air pressure switch fault, blocked flue, blocked condensate, or wiring fault.
E50	Hot water NTC fault
E110	E110 safety thermostat operated
E119	Water pressure switch not operated
E125	Circulation fault (primary circuit)
E130	Flue NTC operated
E133	Interruption of gas supply or flame failure
E160	Fan or fan wiring Fault
E193	Pre-circulation fault

Error Code	Possible Fault
1 flash green	Maximum flow temperature exceeded, Flow temperature rise rate too high, Excessive difference between, flow and return temperature
2 flashes green	BL terminals on User Interaction, Controller are open circuit
3 flashes green	No flame detected during operation
4 flashes green	Bad connection or a wiring fault, Internal communication fault
5 flashes green	Parameter error or faulty PU, Configuration error or PCB fault
6 flashes green	Possible fault. Internal fault in combustion control unit
1 flash red	Bad connection to flow or return temperature sensor
2 flashes red	Over-temperature thermostat on heat exchanger activated, No water flow through heat exchanger, PCB over-temperature condition, Flue fault resulting in recirculation or activation of air pressure switch (if fitted)
3 flashes red	No ignition, No flame detected following ignition, False flame signal detected
4 flashes red	Fan calibration error, Fan failure
5 flashes red	Bad connection to PU, Parameter error or faulty PU
6 flashes red	Possible fault. Bad connection or wiring fault, Parameter error

BAXI 600 SYSTEM / BAXI 800 SYSTEM / BAXI 600 LPG Boiler Error/Fault Codes

Error Code	Possible Fault
E09	Gas valve connection cable
E15	Gas valve fault
E20	Central heating NTC fault
E28	Flue NTC fault
E40	Central heating return NTC fault
E83	Communication error
E109	Pre-circulation fault
E110	Safety thermostat operated
E118	Primary system water pressure too low
E125	Circulation fault (primary)
E128	Flame failure
E130	Flue NTC operated
E133	Interruption of gas supply or flame failure
E135	Interruption of gas supply (internal error)
E135	Interruption of gas supply (internal error)
E154	Flow/ return sensor temperature test
E160	Fan or fan wiring fault
E270	Circulation fault (Dry fire)
E321	Hot water NTC fault
E384	False flame

Error Code	Possible Fault
1 flash green	Maximum flow temperature exceeded, Flow temperature rise rate too high, Excessive difference between, flow and return temperature
2 flashes green	BL terminals on User Interaction, Controller are open circuit
3 flashes green	No flame detected during operation
4 flashes green	Bad connection or a wiring fault, Internal communication fault
5 flashes green	Parameter error or faulty PU, Configuration error or PCB fault
6 flashes green	Possible fault. Internal fault in combustion control unit
1 flash red	Bad connection to flow or return temperature sensor
2 flashes red	Over-temperature thermostat on heat exchanger activated, No water flow through heat exchanger, PCB over-temperature condition, Flue fault resulting in recirculation or activation of air pressure switch (if fitted)
3 flashes red	No ignition, No flame detected following ignition, False flame signal detected
4 flashes red	Fan calibration error, Fan failure
5 flashes red	Bad connection to PU, Parameter error or faulty PU
6 flashes red	Possible fault. Bad connection or wiring fault, Parameter error

BAXI ECOBLUE (COMBI & SYSTEM) Boiler Error/Fault Codes

Error Code	Possible Fault
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
111	Maximum Limit of Flow Temperature
117	Water pressure too high
118	Water pressure too low
119	System Pressure Low (<0.5 bar)
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)

Error Code	Possible Fault
1 flash green	Maximum flow temperature exceeded, Flow temperature rise rate too high, Excessive difference between, flow and return temperature
2 flashes green	BL terminals on User Interaction, Controller are open circuit
3 flashes green	No flame detected during operation
4 flashes green	Bad connection or a wiring fault, Internal communication fault
5 flashes green	Parameter error or faulty PU, Configuration error or PCB fault
6 flashes green	Possible fault. Internal fault in combustion control unit
1 flash red	Bad connection to flow or return temperature sensor
2 flashes red	Over-temperature thermostat on heat exchanger activated, No water flow through heat exchanger, PCB over-temperature condition, Flue fault resulting in recirculation or activation of air pressure switch (if fitted)
3 flashes red	No ignition, No flame detected following ignition, False flame signal detected
4 flashes red	Fan calibration error, Fan failure
5 flashes red	Bad connection to PU, Parameter error or faulty PU
6 flashes red	Possible fault. Bad connection or wiring fault, Parameter error

BAXI ECOBLUE (HEAT) Boiler Error/Fault Codes

Error Code	Possible Fault
1 Green flash	Boiler temp reached
3 Green flashes	Temporary Flame Loss
4 Green flashes	Communication error between PCB and Control
5 Green flashes	Parameter Error On PSU/PCB
6 Green flashes	Miscellaneous Error
1 Red flash	Sensor Error; Sensor Fault, 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 or PSU Error
6 Red flashes	Miscellaneous

BAXI DUO-TEC /MEGAFLO Boiler Error/Fault Codes

Error Code	Possible Fault
E10	Outdoor sensor error
E20	Central Heating Thermistor Sensor Fault
E28	Flue Thermistor Fault
E110	Boiler Overheat. Ensure radiators are bled of air
E119	Low water pressure. Add water to the system via filling loop
E125	Primary Water Circulation Fault. Ensure radiators are bled of air
E131	Flue overheat lockout. This may follow a power cut, try reset
E133	Ignition fault – Check gas is turned on if prepayment meter checks there is credit. If all ok and E133 persists – contact Engineer to visit & investigate
E160/E161	Fan Fault
E164	Fan Fault
E167	PCB Fault
E168	PCB lock out
E193	Circulation fault

BAXI SOLO (HEAT) Boiler Error/Fault Codes

Error Code	Possible Fault
Flash Flash On	Fan Fault
Flash Off Flash	Incoming Voltage less than 180V
Flash Off On	Overheat lockout
Flash On Flash	PCB fault
Flash On On	PCB fault
Off Off Off	No power supply
On Flash Flash	No circulation/dry fire
On Flash On	Thermistor fault
On Off flash	Live and neutral reversed
On Off On	Ignition lockout
On Off Flash	PCB fault
On Off Flash	Low voltage wiring harness fault

BAXI GA RANGE Boiler Error/Fault Codes

Error Code	Possible 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 AVANTA RANGE Boiler Error/Fault Codes

Error Code	Possible Fault
E0	Temperature sensor fault
E1	Boiler overheat tripped
E2	Poor circulation
E3	PCB fault
E4	Ignition failure
E10	Poor/No circulation
E12	PCB Fault
E13	Heat exchanger thermal fuse tripped
E83/84/85/86/87	Fan fault normally E8

BAXI MAIN ECO COMPACT HEAT Boiler Error/Fault Codes

Error Code	Possible Fault
1 Green Flash	Boiler temp reached
3 Green Flashes	Boiler temp reached.Temporary error, self-reset, if continues will go to 3 red flashes
3 Green Flashes	Temporary Flame Loss. Temporary error, self-reset, if continues will go to 3 red flashes
4 Green Flashes	Communication error between PCB and Control. Temporary error, self-reset.
5 Green Flashes	Parameter Error On PSU/PCB. Temporary error, self-reset.
6 Green Flashes	Miscellaneous Error. Temporary error, self-reset.
1 Red Flash	Sensor Error; Sensor Fault, Temperature Fault or Flow Fault
2 Red Flashes	Boiler overheat tripped
3 Red Flashes	Ignition fault. The boiler has attempted to light 5 times and failed
4 Red Flashes	Fan Fault
5 Red Flashes	Parameter or PSU Error
6 Red Flashes	Miscellaneous

Baxi Boiler 110 Error Code

Your boiler has become too hot to handle.

Suggestion

Firstly, attempt to bleed your radiators. This merely implies that any trapped air in the radiator is being released. Air in your heating system not only makes your entire system inefficient, but it can also prevent the boiler from doing its job and cause it to overheat.

This is less likely to be an issue in more modern homes with underfloor heating, but it can still happen.

Baxi Boiler E133/E28 Error Code

It wouldn’t surprise us if you saw error codes E133 or E28 during the cold months. Baxi boilers (and most other types) use condensate lines to transfer wastewater away from the boiler and onto a drain outside.

This is an important aspect of your boiler’s day-to-day operation since it prevents water from damaging the boiler’s mechanics. However, when it becomes cold outdoors, the drain and condensate pipes can freeze!

Suggestion

Pour warm water safely over the frozen pipes outside your home or give one of our Gas Safe qualified engineers a call if you’re not sure where the pipes are or want a second view.

Baxi Boiler E199 Error Code – Low Boiler Pressure

Your water pressure is low, as indicated by this problem number. A Baxi’s regular water pressure ranges from 1.0 to 2.0 bar.

Suggestion

If the water pressure is less than 1.0 bar, you may need to check your gauge. Boilers frequently need to be repressurized, and in most situations, this is something you can do yourself. Rigid filling loops, flexible filling loops, or an Easy-Fill permanent filling connection are all options.

How to Reset a Baxi Boiler?

Depending on its type, there are three different ways to reset a Baxi boiler. Baxi boilers come in various models, including those with a reset button, a thermostat control knob, or an ON/OFF/SELECTOR switch. Understanding your specific model is crucial for a successful reset.

Restarting a Baxi Boiler with a reset button:

To restart the boiler, press the reset button and wait until the red light disappears. Once the boiler starts, the burner light will come up, indicating that it has fired up. If it does not fire up and instead suggests a fault code, remember that a certified engineer is always available to provide professional assistance.

Restarting a Baxi Boiler with a thermostat control knob:

When your Baxi Boiler flashes a red lockout light, you have to reset it. Turn your thermostat knob anticlockwise and hold it till the red-light stops flashing. Once the red light is gone, change the thermostat knob’s direction to your preferred settings, and you’ve successfully reset your boiler.

Restarting your boiler with an ON/OFF/SELECTOR switch:

To access the boiler’s control panel, open the pull-down panel to view the controls. If the boiler encounters a fault, an error message or light may appear on the display, depending on the model. For example, error code E133 indicates an issue related to the gas supply, ignition, or a blocked condensate.

If your boiler uses neon indicator lights instead of an LED display, the top left light on a 10-neon display usually signals a flame failure. Regardless of the display type, the boiler can be reset similarly.

Turn the selector switch to the “R” (Reset) position, hold for 5 seconds, and release. The error code will then disappear and be replaced by the current temperature. On models with neon indicators, the flame failure light will stop blinking and be replaced by the burner light.

After a few seconds, the orange burner light should come on, indicating the burner has reignited, and the temperature will rise. If the boiler continues to lock out, you should contact your installer or a service engineer to investigate further.

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Final Words

After reading the above error codes, I hope you can now detect the problem and take action. However, no worries if the problem persists or you struggle to identify and understand the code! Contact us, and one of our representatives will guide you on the phone and assist you with your problem.

FAQ'S

What is the Baxi boiler error code e1?

This is a less common boiler fault number, but if it appears, it signifies your boiler’s pressure has dropped and a water leak is preventing your system from working properly. In this situation, you’ll need to repressurize your system to resolve the issue.

What is the Baxi boiler e119 error code?

In most circumstances, an E119 fault on a Baxi boiler implies that there is water leaking somewhere in the system, which is a job best left to the pros; leaks can be difficult to locate and repair and may require specialized understanding.

What is the Baxi boiler e118 error code?

Low water pressure is usually indicated by the code E118. If you check at your gauge, you’ll notice that it’s down to zero on this gauge.

What is the Baxi boiler e168 fault code?

When the boiler detects a problem but is unable to determine what it is, the error code E168 is displayed. This can happen if the boiler has reset after a malfunction has occurred, or if there has been an external issue affecting the boiler, such as a power outage.

What is the Baxi boiler fault code e160?

A fan failure on a Baxi boiler with an error number of e160 could be a seized or burnt-out fan, or even the fan harness wire; verify with your installer if your boiler is still under warranty. To diagnose the problem, BoilerOne recommends consulting a gas safe qualified engineer.

Posted by: Martin Astley 23 March 2022