S
Stu Davis
It a common issue, check that the pump is wired to the boiler. Had a few where the pump isnt wired back to the boiler and when the thermostat is run near max and boiler shuts off pump over run wont work as pump isnt wired back and it bangs like mad. To test it run boiler on a much lower temp and see if it cures the fault.
If pump isnt wired direct to the boiler its an installer fault. I would check wiring at the boiler end if as per other post's trv issue isnt the problem.
If pump isnt wired direct to the boiler its an installer fault. I would check wiring at the boiler end if as per other post's trv issue isnt the problem.
