How much does it cost to fix Baxi error code E.01 – .04?

Typical repair cost for the Baxi E.01 – .04 fault is £100-350 including labour.

E.01 – .04 High

Baxi E.01 – .04 Fault Code

Q: What does the Baxi E.01 – .04 fault code mean?

Your boiler is struggling to keep its flame lit and has safely shut down after repeatedly failing to stay on.

Also written as E0104 — same fault.

The Baxi E.01 – .04 fault code means: your boiler is struggling to keep its flame lit and has safely shut down after repeatedly failing to stay on.. It appears on 24 Baxi models in our database.

Technical description: Loss of flame detected 5 times in 24 hours (with burner on).

What causes the Baxi E.01 – .04 fault?

This fault occurs when the boiler’s control system detects that the flame has gone out unexpectedly five times within a 24-hour period. It is usually caused by a component failing to accurately sense the flame, a blockage in the drainage system, or an inconsistent flow of gas prevented the burner from staying lit.

This fault is more frequent during freezing winter spells, as a frozen external condensate pipe can cause water to back up into the boiler and extinguish the flame.

Typical repair cost £100-350 (including labour)

DIY fix possible

Check that your gas emergency control valve is open and any pre-paid gas meter has credit.Verify if other gas appliances, like a hob, are working to rule out a wider gas supply issue.Restart the boiler by turning the selector switch to the 'Reset' position for five seconds.

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Baxi models that show the E.01 – .04 fault code

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

Source

Baxi E.01 – .04 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