I am having problems with this valve buzzing which I assume is going to mean replacing the valve head. Any advice on this (mainly the electrics) would be appreciated. Thanks
That's quite normal. The only time the valve returns to the HW position is when power is removed completely (fuse removed from spur etc) or only HW is ON at the timer and the HW stat is calling for heat.A more complete explanation is that there is buzzing when the valve is energised and it doesn't return to the default hot water position when the heating and water are off.
Yes it will return to the HW position, but all you are doing is trying to solve a problem which does not exist.I get round this by removing (unclipping) the valve head which allows the valve to spring back to its correct (hot water only) position. I then replace the valve head. The valve then goes to the correct position when the heating turns on.
Maybe the contacts on the micro-switches in the actuator are arcing or the motor is slowly wearing out - they do fail eventually - but it's not really something to get worked up about. After all, you don't spend your time listening to the valve buzz and, presumably, you can't hear it when the door to the cupboard housing the valve etc is closed.Sorry I also should have mentioned the buzzing noise has only been present for 2 or 3 weeks.
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