While you wait for answers, we may have found some information which could help you.
Click here for Saunier Going WaterHow can I fix my Saunier Duval Semia Condens boiler?
Saunier Duval timeclock not working?
isotwin condens f 35 e service menu codes?
Saunier Duval Isofast condens F35E....nothing working?
saunier duval sd620f?
Saunier Duval Thema F23 anyone have a link for manual?