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Boiler is about 25 years old no problems since we have had it however when we switch it on and it gets to temperature it starts to make loud whistling noises

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Check that no wire makes a contact with the cover. check the water pump. does it vibrate when on. it not could be internal corrosion. close ioslator valves and remove to examine

Posted on Apr 13, 2015

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Posted on Jan 02, 2017

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From your description it appears that the boiler is shutting down on internal boiler water temperature (too high), your 'briefly too hot' HW symptom may be caused either by the boiler side of the secondary heat exchanger being blocked/caked in sludge, OR the DHW side of it being scaled. Either way a new or replacement (descaled) secondary heat exchanger MAY inprove things. It's not easy on these old clunk-pots, and EVERY disturbed seal will subsequently leak, so get a good supply of o-rings and fibre seals before you start ("you" being the competant fitter you employ)

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