While you wait for answers, we may have found some information which could help you.
Click here for Water Lever Tap
Saunier Duval Isofast condens F35E....nothing working?
saunier duval boiler problem?
saunier Duval is over pressurising when the heating is on. ?
Saunier Duval Thema F23 anyone have a link for manual?
'f19' error report - Saunier Duval 'Thermoclassic' boiler?
I have a Saunier Duval Isotwin condens F 35 E with hot water No heating?