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"Sounds more like a sticking mid position valve to me" Thanks for reply...how can I sort this...or does it need a new valve?

My central heating comes on when programmed am or pm. Boiler fires up, pump can be heard and radiators heat up as expected. However, if CH alone is selected on control unit ( it lights up) but the boiler does not fire up, pump cannot be be heard and radiators remain cold. Moving temp up on...