While you wait for answers, we may have found some information which could help you.
Click here for Combi Ch Boilerpressure relief valve?
My heating and hot water do not work and “A03” is flashing?
Chaffoteaux et Maury with no hot water?
My boiler won't light but will when we take the cover off ?
chaffoteaux brittony combi se 80?
gas water heater chaffoteaux britony 11t (geyser ) 11 years old?