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Thanks for the replies so far. I think I'll try and work out how to get the main cover off while it's running and see if putting light pressure on any points inside gets rid of the noise. My gut feeling is that it's a panel vibration rather than the pump since this has been happening for over a...

Hi, I have a Potterton Puma Combi boiler (not sure of exact model) that's been making horrible wailing noise when running in central heating mode. What seems to happen is that once the boiler gets to a certain temperature there's a constant loud whine (more like a banshee wail!) that can be...