I've searched google and cannot find the problem I'm having.
The system is a Potterton Puma 100e and it is about 6 years old. The
main control board has been replaced, but that was a while ago, and this
problem is relativly new.
The central heating and hot water work fine, but the pump runs more or
less continuously. I would guess that there is some problem with the
pump overrun circuit, but would not know where to start diagnosing it.
Any help appreciated.
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