My hot water was coming on when not switched on, even when I removed the programmer, so I replaced the programmer (with identical one). Still had the same problem, checked in loft and zone valve was ceased. I replaced the zone valve, and when i turned fused switched spur on a little bit of smoke came out of new zone valve, and fuse blew. I checked whether the valve was open or closed and repositioned zone valve in correct position. Then when I turned the programmer on CH it worked, but as soon as I switched HW on it fused at the spur switch. Any suggestions as to what is wrong, I have been told that there may be a problem with a neutral on the PCB??
Potterton Suprima System L
- Thread starter langleyH
- Start date
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H
herebriefly
What valve did you take out, and what was it replaced with?
David
David
If you changed like for like it should work, maybe you've put a wire in the wrong place.
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And it will have cost you more money on DIY than if you had got a pro in to sort it 
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