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From buzzing to always pumping

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From buzzing to always pumping Empty From buzzing to always pumping

Post  Julesm99 Mon Apr 12, 2010 5:12 am

Hi, we had the dreaded buzzing sound, and duly determined that it was the pcb board, and replaced it.

However, I have now put the old board back, as the new one made the pump keep going, pumping hot water rtound the rads, with the stat on the wall indicating 27 degrees, even when the stat was turned down to 19 and the boiler (I think) was off?

When I put the old board back, the pump returned to going on and off immediately the stat clicked either way respectively. For a while I thought the new board was doing the right thing and letting the hot water continue to pump for a while, but I think it turned out to be more like an hour before we realised it hadnt gone off and it was getting very hot. I'm guessing the new board could actually be ok and something else might need to be changed?

Any pointers gratefulyl recieved.


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Join date : 2010-04-12

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From buzzing to always pumping Empty Re: From buzzing to always pumping

Post  Mike the Boilerman Tue Jul 06, 2010 1:12 am

Hi Jules,

It'll be a faulty new board. I encountered this fault several times earlier this year. I think Gledhill probably made a bad batch. The CH pump should turn OFF as soon as the stat clicks when you turn it down.

Cheers, Mike

Mike Bryant AKA Mike the Boilerman, Gledhill repair specialist, webmaster of & For information about my Gledhill repair service or to make a booking call me on 07866 766364. (Please don't phone me for advice if you are fixing a Gledhill yourself, ask on here instead - I run this forum partly to cut down on the phone calls!)

Mike the Boilerman

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