We may have found other answers which could help you.
Success
Message
fault code meaning?
Isar HE 35 heats central instead of warm water?
isar he24 heating on permantly?
my isar he24 keeps flashing h3what does this mean?
Isar Boiler?
re-filling?
Can you help with a part number or name?
l and f flasing on isar he24 boiler?
should i get my boiler fixed or replaced?
How to fix a leak between the burner and heat exchanger?
Fault codes LF and H2 on my isar He30?
yet another problem ideal isar he30?