Baxi boilers covered
Baxi has made boilers in the UK for decades, and its combis are fitted in a great many homes, including new-build properties. The guidance on this page applies to the main ranges you are likely to find:
- Baxi 200, 400, 600 and 800 combis, the current numbered ranges. Higher numbers generally bring longer warranties and more features.
- Baxi Duo-tec, a long-running combi range fitted in large numbers over the past 15 years or so.
- Baxi Platinum, an earlier premium combi range that is still common.
Older Baxi models, and boilers badged under related brands, may use different codes, so always check the manual for your exact model.
How fault codes appear on a Baxi boiler
On most current Baxi combis a fault shows on the digital display as the letter E followed by a number, for example E133 or E119. On some models the code flashes, and a symbol such as a flame with a cross through it or a spanner may appear alongside. The code tells you which part of the system the boiler is unhappy with.
Write the code down before you do anything else. If you do end up calling an engineer, giving them the exact code, the model name and how often the fault happens will help them bring the right parts.
How to reset a Baxi boiler safely
Most Baxi boilers have a reset button on the front control panel, often marked with an R or a reset symbol. On some models you press it once, on others you hold it for a few seconds until the display clears. The user manual will confirm which applies to yours.
Before resetting, deal with any obvious cause. Check the pressure gauge, make sure the gas is on and look at the condensate pipe in cold weather. If the code returns after 2 or 3 resets, stop and call a Gas Safe registered engineer. A fault that keeps coming back usually points to a part that needs attention.
Checking the pressure gauge
Baxi boilers have a pressure gauge on the front panel or a pressure reading on the display. With the heating cold it should normally read between 1 and 1.5 bar. If it drops below about 0.5 bar most Baxi combis will stop and show a low pressure code such as E119. Our guide on how to repressurise a boiler explains how to top it up with the filling loop.
If the pressure climbs well above 2.5 bar when the heating is on, see our guide to boiler pressure that is too high.
Common winter faults
A frozen condensate pipe is the most common cold weather problem on Baxi combis, and it often shows as E133 because the boiler cannot keep a flame. Thaw the pipe with warm (not boiling) water or a hot water bottle, then reset. Our frozen condensate pipe guide covers this step by step.
If you smell gas, turn off the gas at the meter if it is safe to do so, open windows and call the National Gas Emergency Service on 0800 111 999. Do not operate electrical switches.
When to call a Gas Safe engineer
Do not remove the boiler casing. The gas valve, ignition electrode, fan, pump and circuit board must only be checked by a Gas Safe registered engineer. Call one if a code returns after resets, if the pressure keeps dropping, or if you can see water leaking from the boiler.