help no ch/hw

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11 Nov 2004
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I have a potterton puma 80 combi the problem I have is if I turn on the hot water nothing happens the pilot light is on but it wont fireup can u advise thanks
 
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has this just started or have you had any work done. It's probably just a pressrue sensor which needs replacing but for example if the mains stoptap is turned down that could be the cause
 
it started 2 days ago and no i have not had eny work done on it thanks
 
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If itisn't firing for HW but your CH is working, the flow switch isn't doing it's thing. If you drop the front panel(s) so you can see in to the pcb, there's a red light which should come on when HW is drawn.

If not, then down to the left there's a brass thing aabout 80mm diameter with a hexagonal shaft about 30mm long going to the right. On the end of the shaft there's a microswitch. Something could be stuck, seized, had water leak into it, etc.
 

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