While you wait for answers, we may have found some information which could help you.
Click here for Thorn Olympic Boilerthermocouple?
Location of pilot light Thorn Housewarmer Super back boiler?
how can i fix my thorn M44/54 gas boiler?
what boiler would i replace my thorn 44/54 with?
apollo boiler banging noises ?
thorn back boiler housewarmer s?