I have a 12 year old Ideal Isar HE24 (i know - don't lecture me) which was installed 1 year before I moved into my house. I've had various things go wrong with it over the years, all of which have been covered with boiler care but something started happening to it a few days ago.
I heard an occasional knocking noise coming from it and discovered that it happened after switching on and off. When I switch it on it gets incredibly hot - so much so that I can't touch the casing but after 5 minutes it calms down. I get hot water and as normal and my central heating is fine and there are no error codes. The knocking noise is the metal casing contracting and cooling down.
Is it the heat exchanger? Should I be worried?
I heard an occasional knocking noise coming from it and discovered that it happened after switching on and off. When I switch it on it gets incredibly hot - so much so that I can't touch the casing but after 5 minutes it calms down. I get hot water and as normal and my central heating is fine and there are no error codes. The knocking noise is the metal casing contracting and cooling down.
Is it the heat exchanger? Should I be worried?