While you wait for answers, we may have found some information which could help you.
Click here for 50ff Boiler Coming
'f19' error report - Saunier Duval 'Thermoclassic' boiler?
How to repair F4 code?
I need to find the reset switch ?
Saunier Duval Isofast condens F35E....nothing working?
Saunier D’uval therma classuc?
Saunier Duval timeclock not working?