i have a problem with the heating system. I dont have hot water or heating. I took the screw out of the pump and made sure it was working.I took the top of the three way valve and manually moved the screw.large clonk noise both ways? bled every radiator in the house and undid the pipe next to the three way valve to make sure no air lock. where is the heated water going and what next? any idea whats happening as kinda cold in here now
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