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how can i fix ideal combi he 35?

ideal he 35 combi stuck in dhw mode
regards pj
peter, December 2010
I'm assuming this is an Isar?
The most common fault for this boiler to be stuck on domestic (d) would be water movement, look for a leak on the HW supply including dripping taps.
Try turning off the cold water feed to the boiler, if this cures the problem, you have a leak somewhere.

If however it dosen't, you probably have a faulty HW thermistor.

Carefree, December 2010
link Click here to see other fixes for Ideal HE 35.