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very intermittent. Flow valve was replaced not so long ago, the boiler i'snt that old, new programmer unit. It seems to occasionally just stay on with the radiators staying constantly hot and not controlled by the house TStat. It did it the other day. The boiler is in the garage so has a...

With the program controller off and the room thermostat at 0 and the froststat at 3 th eheating comes on in warm weather?

I have a single zone system which even when warm out decided to call for heating occasionally. On the occasion it happened I checked: Frost T-State in Garage - Off Room T-State in Lounge - Off Heat/Water Controller - Heating Off / Water On Triport Valve - (H M W) turned to H - Heating Pump -...