Can anyone advise why my Worcester Bosch System boiler when heating hot water does this sort of surging/woosh/hum that's a slightly higher pitch than the normal water heating noise noise like a plane taking off every 5 to 15 minutes? It last about 10 to 15 seconds each time. It's very noisy and our old plumber who dealt with our boiler is no longer in business so even though it has done this before we can't remember what it is. Boiler is regularly serviced. Thanks in advance.
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Discuss Boiler sounds like a plane in the Boilers area at Plumbers Forums
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Can you upload the sound ?
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do you have an auto bypass on the system as it sounds like a flow issue
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The red headed valve below the pump it’s on setting 4 atm try undoing it to 3 the red part spins
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Yes the indicator should move so sounds like the issue
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You would have to drain the heating system depends on your skill level
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