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I have a Potterton Suprema 50. I'm trying to save money by setting my boiler thermostat to minimum and turning down the radiators to half-maximum. My aim is to have a house temperature which is lower than the minimum thermostat temperature. I've read that this is supposed to work. Can someone...

I'm using a Potterton Suprima 50. When I switch on the boiler for heating or hotwater everything proceeds as it should to begin with & the gas lights. For about 20 seconds everything is great. Then gurgle sounds are heard as though the water level is low, there are some watery popping noises...