Hi , could be the heat exchanger. Is the boiler noisy, nettling, hissing when in operation .eventually they crack and leak . if the pump failed it could have boiled dry and cracked
Sorry , meant nettling, not nettling
Hello. The boiler is no noisier than usual - and works OK. Can the heat exchanger be replaced, or does in mean a new boiler?
Yes the heat exchanger can be replaced . takes a few hours
to be honest it may be better to replace the boiler . the heat exchanger may be a bout 450 plus labour. Whereas you could get a new boiler for 1000. But your boiler is pretty basic which means less to go wrong
Also new boilers are more fuel efficient , cheaper bills .