While you wait for answers, we may have found some information which could help you.
Click here for Boiler Heating Chaffoteauxchaffoteaux britony combi 80 g20 20mbar - h/w ok, c/h always on?
pressure relief valve?
My Chaffoteaux britony combi se has 40 80 fault?
How cani fix my chaffateaux Maury boiuler?
Chaffoteaux Mx2 24 error 50?
chaffoteaux calydra 80 combi boiler?