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