Chaffoteaux Britony Combi SE 100 LPG Common Problems & Fault Codes (2026 Guide)

The most common Chaffoteaux Britony Combi SE 100 LPG problems

The faults most likely to send a Chaffoteaux Britony Combi SE 100 LPG into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.

The 6 most common faults

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Overheat sensor switch open.

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Overheating defect without lock out.

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No flame detection.

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Ionisation printed circuit board faulty.

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Antifrost mode on (pump in operation).

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Antifrost mode on (burner and pump in operation).

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Call a Gas Safe engineer if…

You can smell gas or see signs of a leak
The Chaffoteaux shows an Emergency or High severity code
The boiler keeps locking out after repeated resets
You've tried the DIY checks and the fault hasn't cleared
There's visible water leaking from the boiler
The flame is yellow or orange instead of blue

See the full 13-code list for the Chaffoteaux Britony Combi SE 100 LPG