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Any ideas? The circ pump on my central heating system (Grundfos) is positioned around 1.6m above the hot water outlet of the boiler. When the pump is running it sounds as if the pump gets so far then a column of water falls back into the boiler and then the pump lets out an almighty snore. To me...

I have a problem that has just sprung to light. I have a traditional wet central heating system with a pumped rad circuit and a gravity hot water circuit. I am running a Honeywell ST699B controller and a thermostat in the lounge. The radiators have started operating even if the heating...