We are trying to work out what is wrong with the boiler pump which continuously circulates water even when there has been no call to heat the rads or water. We have checked the external thermostatic controller which is working correctly and is correctly wired up. The zone valves are also working normally and are correctly wired up.
The only way to stop the pump is to turn the whole boiler off at the isolator switch on the wall. We are thinking it is an internal thermostatic issue within the boiler itself but cant see how to check the probe end of the thermostat.
First post here so apologies if this is in the wrong forum. Any tips would be great. Many thanks in advance. : )
The only way to stop the pump is to turn the whole boiler off at the isolator switch on the wall. We are thinking it is an internal thermostatic issue within the boiler itself but cant see how to check the probe end of the thermostat.
First post here so apologies if this is in the wrong forum. Any tips would be great. Many thanks in advance. : )