While you wait for answers, we may have found some information which could help you.
Click here for Protherm Heating Timer
my protherm 100ec combi keeps giving the fault f1?
Protherm 80e - Fault F1?
my protherm 40-50ci boiler blows fuse?
can i repair a diverter valve for a protherm 80e?
problem with protherm 80e?
Protherm 100ec overheat trip problem?