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I have a constant humming in my pipes even when my central heating is off, I have a Halsted 50 located in the ground floor(kitchen) The sound is constant and sounds like pipes that have a flow through them, any thoughts will be helpful.

Somebody please help, I have a problem with my central heating pipes, even though the heating is turned off there is a constant hissing coming off the pipes, its terribly loud and when i listen to the pipes there seems to be a flow of some sort, one of the pipes seem warm and when i listen to...