E 29 Medium

Chaffoteaux E 29 Fault Code

Also written as E29 — same fault.

The Chaffoteaux E 29 fault code means: your boiler has lost its connection to the thermostat that measures the temperature in your home, so it doesn't know when to turn the heating on or off.. It appears on 3 Chaffoteaux models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Room sensor open circuit
Typical repair cost £120-200 (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 →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like E 29: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Chaffoteaux models that show the E 29 fault code

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

Source

Chaffoteaux E 29 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 31 August 2026