HUGE boiler savings!

Compare obligation-free quotes now!

  • All boiler models quoted
  • Trusted local boiler engineers
  • Latest December deals

New & Replacement

Save on new boiler installs!

  • Upgrades and new installs
  • Expert advice included
Get Free Quotes

Repairs & Servicing

Boiler maintenance for less!

  • Emergency repair work
  • Annual service savings
Get Free Quotes

Save on repairs now. Click!

2022 Baxi Boiler Error & Fault Codes


Baxi boilers are very reliable products. However, even the best boilers will experience problems from time to time. When you place your trust in a brand such as Baxi you would expect your boiler to always operate reliably and efficiently. Faults will inevitably occur and issues with your boiler will be resolved by simply resetting the error code, or calling out your local Baxi engineer.

This guide helps you understand what Baxi Boiler Error Codes are and how they can be fixed by an engineer. Our network of engineers have many years experience working on boilers, so you can trust us to help you and solve any boiler problems you may encounter.

Baxi 200 / 400 Combi Gas Boiler Error Codes


Baxi boilers are very common in the UK, and the 200 / 400 series is one of their more popular. It’s a boiler that needs to have some parts replaced occasionally, or it can get into an error mode (displayed on the display monitor).

If you're not sure what Baxi 200/400 Combination Gas Boiler Error Codes mean then have a look at our list of codes below and use them with confidence when you need professional help to sort out any boiler problems.

Fault Code Possible 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 – .21Temporary 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 – .01Communication 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 – .47Wiring 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


Its of the upmost importance that your Baxi Boiler is maintained on a regular basis. However, unfortunately they do sometimes break down. Boilers do have their occasional error, but now they proceed to display the error code on their control panel, which makes it easier for engineers here to identify. We have therefore put together a guide of Baxi 600 Combi Gas Boiler Error Codes and what they mean.

Fault Code Possible 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
  1. Boiler max temperature exceeded for gradient (probable pump jammed or air in the circuit
  2. Boiler max temperature exceeded for overtemperature (probable pump jammed or air in the circuit
  3. 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 Avanta Range Error Codes


The Baxi Avanta is a popular boiler throughout the UK. Also, it can often be difficult to work out what's wrong when you have an error code displayed on your boiler. In this guide, I'm going to show you all of the codes for the Baxi Avanta range and which errors they could mean.

Fault Code Possible 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 Duo-tec/Megaflo Error Codes


The number of error codes can become confusing. This article lists the detailed error codes which Baxi Duo-tec / Megaflo boilers may have. It is written in such a way that it may be used as a reference when needing to diagnose the problem with your boiler.

An error code will be displayed if there is a fault with the boiler, or it doesn't have the correct amount of water in it.

Fault Code Possible Cause
E10Outdoor sensor fault
E20Central heating thermistor sensor error
E28Flue thermistor error
E110Boiler overheat error
E119Low water pressure error
E125Primary water circulation error
E131Flue overheat lockout error
E133Ignition error
E160 / E161Fan error
E164Pressure sensor fault
E167Printed circuit board (PCB) error
E168Printed circuit board (PCB) lockout error
E193Circulation error

Baxi EcoBlue Error Codes


The Baxi EcoBlue boilers are very reliable products. However, even the best boilers will experience problems from time to time. When you place your trust in a brand such as Baxi you would expect your boiler to always operate reliably and efficiently. Faults will inevitably occur and issues with your boiler will be resolved by simply resetting the error code, or calling out your local Baxi engineer.

The current Baxi EcoBlue error code list is not in a convenient format. Therefore, we have posted it here to make it easier for our visitors. We hope you find this a useful resource.

Fault Code Possible Cause
110Overheated – 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)
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

EcoBlue Advance / Ecoblue Regular Gas Boiler Flashing Light Error Codes


A Baxi EcoBlue boiler EcoBlue Advance error code is displayed on the front of the boiler when there has been a problem with it. These may be clear and easy to read or perhaps not so easy. Here are some of the most common errors and their meanings to help you get to grips with your boiler's display screen.

Fault Code Possible 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 GA Range Error Codes


If you have an issue with your Baxi boiler and have no idea what the issue is, then you could be looking at a code that has been displayed. There are range of codes that get displayed on the boiler, but we will be looking at G.A. Range Error Codes and how they are displayed. These error codes can tell you whether there is a fault with the boiler so you know where to start in troubleshooting your issue.

Fault Code Possible Cause
E53Poor combustion – flue terminal may be blocked
E110Overheated – try bleeding your radiators
E117System water pressure high – try bleeding water from your radiators
E118System water pressure low
E125Overheat – try bleeding your radiators
E133Gas supply fault
E4Ignition failure
E09Gas valve wiring fault
E10Outdoor sensor error
E15Gas valve connection fault
E20Central heating thermistor sensor fault
E28Flue thermistor fault
E40Central heating return thermistor fault
E53Flue obstruction
E55Calibration required
E78Water pressure sensor fault
E92Combustion test alarm during auto-setting
E109Poor circulation
E110Boiler overheat tripped
E117System pressure high (>2.9 Bar)
E118System pressure low(< 0.5bar)
E125Primary water circulation fault
E128Loss of flame during operation
E129Loss of flame during calibration
E133Ignition fault
E135Internal error
E154Primary flow fault
E160Fan fault
E270Dry fire
E317Wrong power supply (Hz)
E321Not water thermistor fault
E384Flame detected when gas valve off
E385Low voltage (less than 195v)

Baxi MainEco Error Codes


Baxi MainEco Error Codes help you in finding out what the problem with your boiler is. This will allow you to save time and money, as it's a lot faster to troubleshoot and fix an error code than to wait for the engineer and identify the fault. This list describes most of the error codes you may see on your control panel and tells how to deal with them.

Fault Code Possible 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 Platinum Error Codes


A boiler fault can be anything from a clogged filter to an obstruction somewhere else in the system. These faults can be intermittent, meaning that they may work fine for a while and then stop functioning. Subsequently you will need to check the error code on your Baxi platinum boiler before your engineer arrives.

Baxi Platinum boiler error codes will all appear in the same way on your display, as FFF. The 3 digits are the error code that the diagnostic system is trying to tell you. The first digit refers to the function. Another digit denotes a specific fault and the final digit identifies a more specific fault within that function.

Fault Code Possible 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 Solo Error Codes


Baxi Solo Error Codes provide a useful way to report a technical fault with your gas central heating boiler. The error code and error LED guide will help you diagnose trouble codes and more importantly how to fix them. These Baxi Solo Error Codes will explain what they mean and the corresponding error code LED on the control console.

Fault Code Possible 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
Free Boiler Quotes? Apply online now!

News Discover the latest boiler offers this December, get some free quotes!