Hi The frost stat is there to protect the boiler, if the temp goes below a set temp about 5-7 degrees it will switch the boiler on so that it will protect it from frost damage. If it is not in the way I would leave it.
Hope this helps.
Hi thanks for replying, do you think it might be causing my pump/boiler to switch on/off itself when not timed to do so and is there a way to test it ? I
Hi there, I turned the frost thermostat to minimum (it was at 5 degrees) and the problem with my self igniting boiler/pump has been ok up to now. many thanks