Baxi is one of the most widely installed boiler brands in the UK. This page collects our guides and the common Baxi combi boiler fault codes, with what each one means and what you can safely check yourself.
Baxi combi boiler error codes
- E109 Pre-circulation fault
- E110 Overheat — safety thermostat tripped
- E117 Water pressure too high
- E118 Water pressure too low (below 0.5 bar)
- E119 Low water pressure
- E125 Primary circulation fault
- E128 Flame failure — the flame has failed repeatedly
- E130 Flue thermostat tripped
- E133 Failed to light — gas supply interrupted or flame failure
- E134 Gas valve open with no gas detected
- E135 Internal gas supply interruption
- E160 Fan or fan wiring fault
- E20 Central heating temperature sensor (NTC) fault
- E28 Flue sensor fault, or blocked flue/condensate pipe
- E321 Hot water temperature sensor (NTC) fault
- E384 False flame detected
- E40 Central heating return sensor fault
- E50 Hot water temperature sensor (NTC) fault
Should you repair or replace?
As a rough rule, if your boiler is more than 10–12 years old and the repair is over a few hundred pounds, it's worth getting a replacement price before you commit. Parts for older models also get harder to find.
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