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Yes that would make sense if the connection between HW off and the grey wire in not good. I will try and check the continuity.

I’ll test both independently tomorrow, but can’t understand why it’s reading 62v unless programmer is faulty.

Correction- terminal 2 on cylinder stat

From terminal 1 (HW off) on programmer to the connector block in wiring centre (7 for the left) which is also connected to grey wire from 3 port valve and cylinder stat terminal 3 (Sat).

Not the tidiest

Unfortunately it’s not easy to get a photograph that would show all connections clearly. The wiring centre is upstairs in the airing cupboard and the programmer downstairs by the boiler. Took me ages to trace where everything goes.

Recently move house and experiencing problems with the heating and hot water system. Heating only works when hot water is on. Suspected it was a problem with the 3 port valve and called in my usual heating engineer, who did a couple of tests and replaced the power head. Didn’t solve the issue...