Boilers · Fault code
Baxi E133 fault code — what it means
Short answer
E133 on a Baxi boiler means the boiler did not establish a flame — the gas supply was interrupted or the boiler could not light. Check the gas supply first, then the condensate pipe in cold weather. If both are fine, it needs a Registered Gas Installer.
What changes the answer
- whether other gas appliances work
- cold weather
- how often it has happened
What you can check yourself
- check that a gas hob or gas fire lights
- thaw a frozen condensate pipe with warm water
- reset once as shown in the manual
What to do next
One reset is fine. If E133 returns, book a repair. Never take the casing off a gas boiler. Anything inside the case is a job for a Registered Gas Installer.
This page gives general information only. Christy needs to see your system — in person or from your photos — before he can give you firm advice or a price.