How much does it cost to fix Baxi error code E133?

Typical repair cost for the Baxi E133 fault is £100-350 including labour.

E133 High

Baxi E133 Fault Code

Q: What does the Baxi E133 fault code mean?

Your boiler has failed to ignite, meaning it cannot light the gas to provide heating or hot water, often due to a lack of gas flow or a blocked condensate pipe.

The Baxi E133 fault code means: your boiler has failed to ignite, meaning it cannot light the gas to provide heating or hot water, often due to a lack of gas flow or a blocked condensate pipe.. It appears on 32 Baxi models in our database.

Technical description: Failure to light (could be a gas supply issue)

What causes the Baxi E133 fault?

This fault occurs when the boiler tries to ignite three times but fails to detect a flame, causing the system to shut down for safety. The most common reasons are a temporary interruption in the gas supply, a blocked drainage pipe, or dirty internal components that can no longer create a spark.

This fault is significantly more common during freezing winter temperatures, as the external condensate pipe can freeze and cause a backup that prevents the boiler from lighting.

Typical repair cost £100-350 (including labour)

DIY fix possible

Check that your gas meter has credit and that the gas emergency control valve is open.If it is freezing outside, check if the white plastic condensate pipe leading outdoors is frozen and thaw it with warm water.Press and hold the 'R' or Reset button for five seconds to see if the boiler restarts.

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Baxi models that show the E133 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi E133 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026