I have a myson apollo boiler with Honeywell control and thermostat. i generally have my heating set on twice but lately although the light goes of on the controller to show that the heating is off the boiler remains on. I tried lowering the thermostat setting but this does not seem to work either all though I'm not 100% on this. What could cause the heating to remain on when it should be off?
Thanks
A hot under the collar Ally
Thanks
A hot under the collar Ally