Great post by Softus, as he says, some of us do care and aren't just about screwing peeps for their money. No one knows it all and can always learn from these forums.
I would think that as your hearing the pump running, that stops 30 secs after you turn the controller off, zone valve closing and cutting supply to pump, that you still have a demand for heat even though thermostat is turned down. Have you checked that the thermostat is serviceable and contacts making and breaking? The fact why bathroom rad doesn't have a TRV and is only one heating up when pump running to me indicates that those with TRVs are satisfied by the high ambient temp.
So check your thermostat is working, they can be had real cheap on Ebay.
Regards
This happens even when the hot water is off on the main controller. The bathroom rads are hot and I can hear a pump running. If I turn the central heating off on the main controller the pump stops running after about 30 seconds
I would think that as your hearing the pump running, that stops 30 secs after you turn the controller off, zone valve closing and cutting supply to pump, that you still have a demand for heat even though thermostat is turned down. Have you checked that the thermostat is serviceable and contacts making and breaking? The fact why bathroom rad doesn't have a TRV and is only one heating up when pump running to me indicates that those with TRVs are satisfied by the high ambient temp.
So check your thermostat is working, they can be had real cheap on Ebay.
Regards