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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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you could have a flow problem due to sludge or scale in the boiler, it could be a pump problem as it may not be circulating enough water around the system. or it could be a faulty thermostat if it is not cutting out soon enough.
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if you have a switch on your pump to increase the speed make sure it is on setting 3. if the pump is old then it may be time for a replacement.

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