While you wait for answers, we may have found some information which could help you.
Click here for Combi 80 Boiler WaterHow can I fix my Chaffoteaux & Maury boiler?
My heating and hot water do not work and “A03” is flashing?
pressure relief valve?
Chaffoteaux Mx2 24 error 50?
Relight pilot?
My boiler won't light but will when we take the cover off ?