radiators

[frodsham]

During the night my thermostat tripped on as it should have because like most people I have it set to a certain temperature. Because it got too warm in the bedroom I turned the radiator down to frost control. In the morning when the heating came on again the radiator on frost control actually came on as well. Is this normal? I would have thought that if a RAD is set to "frost control" it would stay off until the temperature dipped dangerously low. I

[SeaJayPea]

As I uderstand these things, and I may be wrong, the radiator will come on until the temperature in the room rises above freezing on frost control. It will then shut off the flow until it drops below freezing again.
Bear in mind, the water in the system is always at one temperature, the thermostatic valves just control the amount of time the radiators stay at that temperature.

[frodsham]

thanks seajaypea.