Main
Fault Codes

Listed below are the common Main fault codes as described by the boiler manufacturer along with a possible cause.

Main Boiler Fault Codes

Code Possible fault User action
E20, E28, E50 and E160 Faulty components You should make a note of the displayed error code and contact your installer or Baxi Customer Support
E110
 Displayed overheat of the primary water or flue system has occurred               Turn the selector switch to the reset position and hold for at least 5 seconds. If the boiler does not relight, or the code is displayed regularly contact your installer or Baxi Customer Support.
E119
 Displayed when the primary water pressure is less than 0.5 bar 
 You can repressurise the boiler yourself, 
E133 Indicates that the gas supply has been interrupted, ignition has failed or the flame has not been detected
 Ensure that the gas supply has not been turned off, and turn the selector switch to the reset position and hold for at least 5 seconds. If the boiler does not relight, or the code is displayed . Regularly contact your installer or Baxi Customer Support.
E133 Can also display in the winter if the condensate pipe of your boiler has frozen The boiler will switch off to protect itself. You can find out how to thaw your condensate pipe by watching this video
E168
 Could mean that your boiler has detected a problem but can't work out exactly what it is.  This could be because the boiler has been reset after developing a fault or because there has been an external issue, such as a fault with the electrical supply              The boiler might have been displaying a different error code prior to resetting, so it is useful to make a note of any error codes you see as this will help your installer identify the issue.  Call your installer or Baxi Customer Support if E168 persists.
Fault CodeSystem Behaviour
E168 Error code E168 could mean that your boiler has detected a problem but can’t work out exactly what it is;
E20 Central Heating NTC Fault indicate faulty components. You
should make a note of the displayed error code
E28 PCB Fault indicate faulty components
E50 Hot Water NTC Fault indicate faulty components
E110 Safety Thermostat operated – displayed when the primary water pressure is less than 0.5 bar. After repressurising the system the boiler should operate. Your installer will be able to advise you about the method of repressurising.
E119 Water pressure switch not operated – displayed when the primary water pressure is less than 0.5 bar. After repressurising the system the boiler should operate. Your installer will be able to advise you about the
method of repressurising
E33 Interruption Of Gas Supply or Flame Failure indicates that the gas supply has been interrupted, ignition has failed or the flame has not been detected. Ensure that the gas supply has not been turned off, and turn the selector switch to the reset position and hold for at least 5 seconds. If the boiler does not relight, or the code is displayed regularly.
E60 Fan or fan wiring fault

Main Eco Compact Boiler

Fault CodeSystem Behaviour
E09 Gas valve connection error
E15v Gas valve error
E20 Central heating negative thermistor coefficient (NTC) sensor error
E28 Flue negative thermistor coefficient (NTC) sensor error
E40 Central heating return sensor error
E83 Communication error
E109 Pre-circulation fault
E110 Safety thermostat operated
E118 Primary system water pressure too low
E125 Circulation error
E128 Flame error
E130 Flue negative thermistor coefficient (NTC) sensor operated
E133 Interruption of gas supply or flame error
E135 Interruption of gas supply
E154 Flow return sensor temperature test
E160 Fan or fan wiring error
E270 Circulation fault (dry fire)
E321 Hot water negative thermistor coefficient (NTC) error
E384 False flame
 


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