While you wait for answers, we may have found some information which could help you.
Click here for Combi Light ModeRelight pilot?
My heating and hot water do not work and “A03” is flashing?
Chaffoteaux et Maury with no hot water?
How can I fix my boiler chaffoteaux&maury?
My boiler won't light but will when we take the cover off ?
How can I fix my Chaffoteaux & Maury boiler?