While you wait for answers, we may have found some information which could help you.
Click here for Boiler 40 30chaffoteaux brittony combi se 80?
How can I fix my boiler chaffoteaux&maury?
chaffoteaux calydra 80 combi boiler?
gas water heater chaffoteaux britony 11t (geyser ) 11 years old?
How can I fix my chaffoteaux & Maury Britony Combi SE?
Relight pilot?