Baxi boiler
fault codes.
What the most common Baxi error codes mean, what you can safely check yourself, and when you need a Gas Safe engineer.
Before you start
- Never remove the boiler casing – only a Gas Safe engineer should work inside it
- Only reset the boiler as shown in your manual, and not more than once or twice
- If the same code keeps coming back, book a repair
Smell gas? Leave the property and call the National Gas Emergency Service on 0800 111 999.
The quick checks
- Pressure: Baxi says the pressure should be between 1 and 2 bar
- Gas: do your hob and other gas appliances work? Is there credit on a prepayment meter?
- Condensate pipe: in freezing weather, is the outside plastic pipe frozen? Only thaw it at ground level, with warm (not boiling) water
- Power: is the boiler’s fused spur switched on?
Common Baxi fault codes
E133 – The gas supply was interrupted or the flame failed to light.
Check the gas is on and your other gas appliances work, check any prepayment credit, and in cold weather check the condensate pipe. Then reset (on older models, hold the selector on reset for at least 5 seconds). If it does not relight or keeps happening, book a repair.
E119 – Low water pressure (below 0.5 bar on older models).
Top up the pressure as shown in your user guide, then the boiler should work again. In freezing weather Baxi also lists E119 as a possible frozen condensate pipe. If the pressure keeps dropping, book a repair.
A.02.06 or H.02.07 (newer models with a digital gauge) – The pressure is too low for the boiler to work.
Top up with the filling link under the boiler until it reads between 1 and 2 bar, as shown in Baxi’s guide and your user guide.
E28, E53, E128 (newer models, cold weather) – Baxi says these, with E119 and E133, may mean the condensate pipe is frozen.
Switch the boiler off, warm the most exposed part of the pipe with a hot water bottle, heat pack or warm (not boiling) water, then switch on and restart. Repeat until it works. On some older models E28 means a hot water sensor fault instead – check your manual.
E110 – The boiler or flue has overheated (safety thermostat).
Reset once. If it does not relight or keeps happening, book a repair.
E20, E28 (older models) – A temperature sensor fault.
Note the code and book a repair.
E50 – Circuit board fault.
Note the code and book a repair.
E160 – Fan or fan wiring fault.
Note the code and book a repair.
Frozen condensate pipe
Baxi’s advice for a frozen condensate pipe is to switch the boiler off, warm the most exposed part of the pipe with a hot water bottle, microwaveable heat pack or warm water from a watering can (not boiling water straight from the kettle), then restart the boiler. See our frozen condensate pipe guide.
Need a repair?
A diagnostic visit is £92.50 for the first 45 minutes. Once the fault is found, we give you a fixed price for the repair before any work goes ahead – often from photos or a short video of the boiler and its display.
Boiler keeps breaking down?
If your boiler is old and the faults keep coming back, a replacement may cost less than you think. See fixed, fully installed prices with our online boiler price.
About this list
Codes and meanings vary between Baxi models – and some codes mean different things on older and newer boilers – so check your boiler’s user guide. This guide is based on Baxi’s published advice on error codes and repressurising, and Baxi Heating’s user guides for its older combi range. Baxi’s own advice is at baxi.co.uk.