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Hi Ive changed the DHW heat exchanger & it has made no difference.The primary flow shaft still dosnt move & does not activate the primary flow microswitch. What do i change next.? Thanks

In reply to comment below. ''Does the pump run quietly in DHW mode or does it sound as though there's air trapped in the boiler?'' The pump runs quietly in DHW mode. Q:If the pump operates the primary flow shaft which activates the microswitch in CH mode(& working) why would it not be...

Thanks for all the info,but i have a final question before taking bits of the boiler apart. You mention checking pump impeller/torque.(see below comment.) ''First check the pump inpeller to see if there is dirt in the eye. If that does not effect a total cure then do a finger test on the...

Thanks can you give me some more info about how the water gets to the DHW HE. Below is something i read about the diverter valve assembly. When a domestic hot water tap is turned on, the flow of water is sensed and causes the diaphragm, via a plastic plate, to act on two stainless steel...

Hi I have a hot water problem with my alpha 240p. (in hot water mode only) When hot water tap is turned on ,the DHW micro switch turns on but the primary flow microswitch does not turn on,this is due to the pin from the primary flow valve not rising to push the switch.(DHW & PRIMARY FLOW...