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Potterton Netaheat M11 no heating no hot water?

The boiler lights up and gets very hot and then closes down.
We have replaced pump and fan.
Zone valve working.
Rads are not heating up and cold water.
Pauline Byrne, March 2014
There is obviously no water flowing through boiler ,is there an air lock in the pump? are all the isolators on after changing pump?is pump running at full speed?

toptrish, March 2014
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