While you wait for answers, we may have found some information which could help you.
Click here for Boiler Working Stoppedpressure relief valve?
How can I fix my chaffoteaux & Maury Britony Combi SE?
My boiler won't light but will when we take the cover off ?
Chaffoteaux Mx2 24 error 50?
Chaffoteaux et Maury with no hot water?
chaffoteaux brittony combi se 80?