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no leaking/dripping taps. always displays 0 unless i'm using the HW (d) or CH (c)

Hi, Another dreaded Isar HE 35 from what I've read on forums. It's just over 3 years old, using an original black PCB. Already had a replacement expansion vessel under warranty. Currently DHW is working fine but CH isn't. As it's now getting chilly in the evenings, I thought i'd fire up...