Ideal Isar HE24
Symptom:
Loud bang, about twice a day
Cause:
Dust and dirt in the air had - over 10 years - been carbonised and clogged the heat exchanger fins. This had caused very high temperatures in the burner, causing the ignition electrode to deform. As a result, ignition was retarded causing a backfire effect. Boiler engineer purchased seal set, opened heat exchanger and cleaned each very narrow fin using a hacksaw blade, brush and vacuum cleaner, before fitting a new ignition electrode. This fixed the problem.
mkpaul, January 2014
