While you wait for answers, we may have found some information which could help you.
Click here for Boiler Heating Protherm
protherm combi?
my protherm 100ec combi keeps giving the fault f1?
my protherm 40-50ci boiler blows fuse?
problem with protherm 80e?
No hot water?
how can I have just hot water from my Protherm 40 - 50 CI boiler?