BoilerFaultCodesChaffoteaux Duo Fault Codes
System Natural Gas Discontinued
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Most common fault codes
Fig. 15 Fig. 16 Fig. 17
Your boiler is failing to detect when you turn on a hot tap, meaning it isn't firing up to heat the water.
Gas Safe engineer required · £150-250
Your boiler is releasing excess water outside through a safety pipe because the pressure inside the system has become too high.
Gas Safe engineer required · £150-300
Your boiler is releasing excess water because the internal pressure is too high or the safety valve has been triggered to prevent damage from overheating.
Gas Safe engineer required · £150-300
All 4 fault codes
Chaffoteaux Duo is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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