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Thanks; I'll look for the air vent thingy...what could it look like? Currently I can get hot water if I run the boiler but no CH. All rads stone cold. Pipe up to 3-way valve hot but CH pipe from it cold.

I have an Ideal Classic Boiler. It keeps cutting out before CH gets hot. Only the upstairs heating works, virtually no heat downstairs. The piping to and from the boiler gets very hot which might explain why it cuts out all the time. Gas board told me the return pipe from downstairs to...