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what should i do then? I did fiddle with the stop tap when there was no water to check what was wrong. Would this have caused it? Have I got a problem with air in the system?

Help. We had a water stoppage yesterday in our area and now after the hot water is used the pipes in the airing cupboard hum loudly for about a minute. I don't have a clue where to start here, i hope the solution is simple! :?: