How much does it cost to fix Chaffoteaux error code A 03?

Typical repair cost for the Chaffoteaux A 03 fault is £120-250 including labour.

A 03 High

Chaffoteaux A 03 Fault Code

Q: What does the Chaffoteaux A 03 fault code mean?

Your boiler has failed to light the flame after several attempts and has switched itself off to prevent a gas buildup.

Also written as A03 — same fault.

The Chaffoteaux A 03 fault code means: your boiler has failed to light the flame after several attempts and has switched itself off to prevent a gas buildup.. It appears on 1 Chaffoteaux model in our database.

Technical description: After multiple attempts (following error E04), should the boiler still not sense a flame, error code A03 will appear on the LCD.

Typical repair cost £120-250 (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 A 03 fault code

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

Minima HE Repair: £120-250

Source

Chaffoteaux A 03 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