While you wait for answers, we may have found some information which could help you.
Click here for Ignite Light ContinuesHow do i fix Saunier Duval boiler - Model Thelia 623?
What's wrong with my Saunier Duval Xeon Central Heating Boiler?
Saunier Duval Thelia 23- no heating/hot water?
How can I fix the boiler?
High pressure on saunier duval boiler?
saunier duval thermoclassic high pressure,,?