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Glow worm

Joined
7 Jul 2006
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United Kingdom
A glow worm betacom 28 works fine on CH but it doesn't on DHW, no flashing lights showing, would it be the valve motor?
 
can you hear the boiler fire up at all ? is the water cold or no hot water flow ? does the rads heat up when running hot water for a while ? could also be sensors ? could be a few things need more detail ?
 

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