summer wine
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Sorry for the delay in getting back, dinner got in the way.
Anyway, thescruff - yes that was what was happening, and Headrush - yes, there was the correct voltage but the pump was not starting up.
When the problem first happened, two days ago, everything else seemed to be working so we assumed it had to be the pump, (even though it was just under a year old), and got it exchanged for a new one, but as the problem was still there, it seemed it wasn't the pump.
Could it have been something as simple as a fuse? We had a new programmer which we hadn't bothered to fit as the other one worked fine. The other half decided to try it just in case but couldn't understand why we were getting no display on it so, figuring that there must be a problem between the boiler and the programmer, he tested the wiring behind the boiler switch but only got a reading out of two of them, so decided to change the fuse. Bingo! It started straight away and since then it's been working all evening. If it was the fuse, it's even more baffling because why was it working at all before, even for short periods, and the programmer always came on as programmed.
Still holding our breath but so far it seems to be OK. If this fuse business turns out to be a huge fluke though, I'd like to be able to come back to you if I may for more of your very kind help.
Thanks
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