If removing the screw to try freeing a central heating pump. One that's not in the boiler is an s plan. Do I need to kill the power to the pump before doing this?
personnally I do it with the system powered and a demand for the pump that way you know in an instant when it is free , you will feel it and hear the water moving once free, just remember to put a decent sized towel below the pump as some water will come out, and a good idea to turn the boiler thermostat to min when doing it
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