How much does it cost to fix Chaffoteaux error code 31?

Typical repair cost for the Chaffoteaux 31 fault is £140-£280 including labour.

31 High

Chaffoteaux 31 Fault Code

Q: What does the Chaffoteaux 31 fault code mean?

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.

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 6 Chaffoteaux models in our database.

Technical description: Communication problem with the display PCB

Typical repair cost £140-£280 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

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.

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