While you wait for answers, we may have found some information which could help you.
Click here for Power Burner Oilfirebird 50/90 gala?
Firebird - S 50 - 90?
How to change a photocell on a Firebird Enviromax boiler?
How do I find the magic eye on Firebird 90 ?
no hot water?
oil burner starts then stops wont start agail till cooled down?