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Hello, cold weather has an effect on your unit because of few factors, 1- inake and exaust venting to the outside are subject to condensation water accumulation and then frost and ice build up restricting the flow of inlet and outlet, check and remove if any.
Is your unit on propane or natural gas?
And the boiler is used for heating and domestic hot water?
n cold weather, the pipe that takes waste water from the back of the condensing boiler - which isn’t there in a normal boiler - freezes solid, shutting down the system.Read this carefully, see if you fit in...