Pump runs for a while then sudden loss of Vs. Faulty PCB?

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4 Jun 2007
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My Glowworm Swiftflow 75E has been cutting out after a sudden rise in pressure of 1 Bar. It usually runs for a while before this happens, but the timing is intermittent.

230v AC is entering the pump during normal operation, but just before the rise in pressure the voltage cuts out.
I’m assuming steam build-up, due to lack of circulation, is causing the pressure rise?

Is this likely to be a faulty PCB?

Thanks[/code]
 
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Any ideas please? It's quite cold. lol
I can order a new PCB off Ebay for £45.

Cheers
 
Faulty thermostat / sensor?
Is the pump regulated or permanently on whilst gas is fired up?
The fault finder on the manual says no 230v to pump, replace PCB.
I just wanted confirmation before spending £45.

Cheers
 
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I replaced the PCB and boiler is now working fine.

One of the switches on the old board has black soot on the transparent cover and it was sparking just before the pump cut out.
It also rattles when I shake the board.
 

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