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Discuss oil combi CH not working help please in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Ok I'll be as concise as possible
1 It's a Eurocal Ambassador.
2 It fires and keeps itself at temp ok.
3 Plenty hot water at the taps
4 Have stripped and cleaned the diverter valve and all seems to do as it should.
5 Have stripped and cleaned the pump.
6 Have used the pump elsewhere and it is working.
7 Have bled the system, up, down, backwards, forwards.
8 there is a non return valve on the CH side of the diverter valve, this has been stripped and cleaned and looks good.
9 Have used the microswitches to fire the pump to force water through the diverter valve non return valve and then to heating system but it doesn;t get past the valve or so it seems.

Any ideas?

Many many thanks.
 
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