While you wait for answers, we may have found some information which could help you.
Success
Message
chaffoteaux brittony combi se 80?
My heating and hot water do not work and “A03” is flashing?
My boiler won't light but will when we take the cover off ?
How can I fix my Chaffoteaux & Maury boiler?
Chaffoteaux Mx2 24 error 50?
How can I fix my chaffoteaux & Maury Britony Combi SE?
Chaffoteaux et Maury with no hot water?
pressure relief valve?
chaffoteaux calydra 80 combi boiler?
How can I fix my boiler chaffoteaux&maury?
gas water heater chaffoteaux britony 11t (geyser ) 11 years old?
Relight pilot?