Baxi boilers
Baxi is one of the oldest names in British heating. Richard Baxendale started the company in Chorley, Lancashire, in 1866. Today it’s part of the BDR Thermea Group. Potterton and Main belong to the same group. In fact, the Potterton and Main websites now send you to Baxi for help.
Newer Baxi boilers use simple numbers: 400, 600 and 800. The higher the number, the higher the spec. Each comes as a Combi (heating and hot water from one box), a System (works with a hot water cylinder) or a Heat boiler (also called “regular” or “heat only”). Older names you may still have at home include the Combi 80e, Duo-tec, Platinum and EcoBlue. Some older homes still have a Baxi Bermuda. That’s a back boiler that sits behind a gas fire.
How Baxi boilers show a fault
Many Baxi boilers show an E followed by a number, such as E133. Some newer boilers use longer codes with full stops, such as H.02.07 or E.04.10. In Baxi’s list, most H codes are short-term problems, and E codes are lockouts.
Watch out for one common mix-up. Many websites say E119 means low pressure. Baxi’s own technical list gives E118 for low pressure instead. Baxi’s frozen pipe advice lists E119 among the codes you may see when the condensate pipe has frozen. So always check your own manual.
Frozen pipes
Baxi says that if your boiler stops and shows codes such as E133, E119 or E128, the condensate pipe may be frozen. Baxi’s advice is to switch off, find the frozen part, warm it gently, then restart. Our step-by-step guide shows how to thaw a frozen condensate pipe.
Before you call an engineer
- Check the pressure gauge. If it’s low, see how to top up low boiler pressure.
- Make sure other gas appliances work, and check any prepayment meter.
- Look at the condensate pipe outside if it’s freezing.
If none of that helps, call a Gas Safe engineer. Give them the model name and the code.
Baxi gas boiler ranges
These are the gas boiler ranges on the Baxi website as of 21/10/2026.
- Baxi 400 Combi 2 Combi
- Baxi 600 Combi 2 Combi
- Baxi 800 Combi 2 Combi
- Baxi 600 System 2 System
- Baxi 800 System 2 System
- Baxi 400 Heat Regular
- Baxi 600 Heat Regular
- Baxi 800 Heat Regular
- Baxi Platinum Compact Combi Combi
- Baxi Duo-tec Compact Combi Combi
Older Baxi ranges
You may still find these in homes. They are no longer sold new, but many are still working.
- Baxi Combi 80e
- Baxi Combi 105e
- Baxi Duo-tec
- Baxi Platinum
- Baxi EcoBlue
- Baxi Bermuda (back boiler)
Common Baxi fault codes
Codes can differ between models and ages of boiler. Always check the user manual for your exact model.
| Code | What it means | What you can do |
|---|---|---|
E118 | Water pressure is low (under 0.5 bar). | Top up the pressure with the filling loop, following your user guide. |
E125 | Water circulation fault. | Check the pressure first. If it's fine, call a Gas Safe engineer. |
E133 | Gas supply fault. The boiler couldn't light. | Check your other gas appliances and prepayment credit. In cold weather, check the condensate pipe for ice. Then call an engineer if it stays. |
E160 | Fan fault. | This needs a Gas Safe engineer. |
H.02.07 | Low pressure in the heating circuit (newer boilers with longer codes). | Top up the pressure with the filling loop, following your user guide. |
E.04.10 | The burner failed to light after 4 tries (newer boilers). | Do the same checks as for E133. |
Baxi manuals
Baxi puts its user guides and installation manuals on its own website. You can find Baxi manuals here. You'll need your model name. The GC number helps too. Our guide shows you how to find your boiler's model and GC number.
Stay safe. You can reset a boiler, top up its pressure and thaw a frozen condensate pipe yourself. Anything inside the case is a job for a Gas Safe registered engineer.
If you smell gas, leave the building and call 0800 111 999.