While you wait for answers, we may have found some information which could help you.
Click here for Apart Problem AristonHow can I fix my boiler chaffoteaux&maury?
How can I fix my Chaffoteaux & Maury boiler?
My boiler won't light but will when we take the cover off ?
chaffoteaux brittony combi se 80?
How can I fix my chaffoteaux & Maury Britony Combi SE?
pressure relief valve?