BoilerFaultCodesChaffoteaux 31 Fault Code
The Chaffoteaux 31 fault code means: your boiler's main control system is having trouble talking to the front display panel, meaning the boiler cannot receive the instructions it needs to provide heating and hot water.. It appears on 5 Chaffoteaux models in our database.
Technical description: Communication problem with the display PCB
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Chaffoteaux models that show the 31 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux 31 fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.
- Chaffoteaux Calydra 100 manual (PDF)
- Chaffoteaux Calydra 24 Green manual (PDF)
- Chaffoteaux Talia Green 25 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026