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Discuss Whistling Heating System in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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AndyJM81

My heating system makes a whistling noises immediately after being turned of or begins to cool after reaching temperature set. I have found a leaking thermostat control, adjusted the pressure on the boiler and bled radiators but it hasn't made any difference. There is no noise at all when the heating is on, only when it starts to cool down.
 

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