While you wait for answers, we may have found some information which could help you.
Click here for Chaffoteaux Maury BoilerChaffoteaux Mx2 24 error 50?
Relight pilot?
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?
My heating and hot water do not work and “A03” is flashing?