Hot water cut out

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Hot water cut out

Post  radnor on Mon Jul 19, 2010 1:16 pm

Boilermate 111. The system runs ok then suddenly no hot water. I thought it might be a dead segment on the motor of the heat exchanger pump so I tested it by wiring it directly to the mains (and it worked). When I then re attached it to the PCB all worked again as normal!
I have now had to kick -start the sysem by this method about three times in the last month and I am totally at a loss as to what is causing it. I wish it would fail completely and then I might have a better chance of diagnosing it. Any ideas please?
Thanks

radnor

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Re: Hot water cut out

Post  Mike the Boilerman on Tue Jul 20, 2010 1:26 am

Hi radbor,

This sounds like a failing DHW sensor to me, but on a Boilermate III there is a flow switch too which can be known to stick. Next time you get cold from a hot tap, leave the tap running and give the flow switch a clout and see if the water starts flowing hot.

Or more elegantly, test the microswitch in the flow switch with a multimeter during the fault condition...

Cheers, Mike

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Mike Bryant AKA Mike the Boilerman, Gledhill repair specialist, webmaster of www.gledhill-repairs.co.uk & www.miketheboilerman.co.uk. For information about my Gledhill repair service or to make a booking call me on 07866 766366. (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!)

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Re: Hot water cut out

Post  radnor on Tue Jul 20, 2010 8:01 am

Many thanks. As I have recently changed the store sensor ( I assume that's the one you refer to as the DHW sensor or are you refering to the pump speed sensor?), I'll go for the flow switch and let you know. Might have to wait a bit though until it fails again!

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Re: Hot water cut out

Post  Mike the Boilerman on Thu Jul 22, 2010 2:31 am

There is no 'pump speed sensor'! The DHW sensor to which I'm referring is on the HW output pipe from the heat exchanger, one of the two pipes connected to the top of the heat exchanger.

Cheers, Mike

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Mike Bryant AKA Mike the Boilerman, Gledhill repair specialist, webmaster of www.gledhill-repairs.co.uk & www.miketheboilerman.co.uk. For information about my Gledhill repair service or to make a booking call me on 07866 766366. (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!)

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