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You also need to check that the main heat exchanger (heat engine) is not leaking. Any such leak would end up in the condensate piping system. You will need to expose the condensate pipework downstream from the condensate trap. Depressurise the boiler completely and isolate it from the...

The pressure gauge on the boiler registers the system pressure so putting another pressure gauge elsewhere on the system pipework will record the same pressure. If the expansion tank diaphragm is holed then the pressure will rise to an abnormal higher pressure (check there are no drips coming...

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