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we have lived here for 12 years, no repairs or work has been carried out except for thermostatic valves fitted, it's only been doing it since the heating was switched on for the winter, left the light on and tried heating garage, and no the boiler doesn't flash up when the pump starts running

the pump in the system runs contiously at night. the pump is a grundfoss selectric. I have checked to see if there is frost stat as the boiler (ideal classic) is mounted in the garage but can,t find evidence of any. The system works excellent except for the noise at night. I have flushed the...