Hi can you help. My y plan system runs perfectly most of the time but on occasions the system will stay on as if the clock is on and the room stat is calling for heat even though both are off. The only way to shut it down is to turn the boiler stat to off or switch off the heating switch spur. If the boiler stat is turned to off a few minutes later the pump stops which is the normal pump run on I think. While in this free running mode the room stat goes out of range (no click on turning stat control up and down) and the rads get very hot. Any help would be good before I spend out on the engineer. Walke40
