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Hi! Can anyone help? I have a Powermax 185 boiler which I recently had serviced and now seems to make a constant whistling sound?? We have called back the engineer who doesn’t seem to know what is causing the noise. It stops when the burner switches off and restarts after a couple of minutes when the burner switches back on. The noise comes out of the flue, so can be heard from outside the house. The boiler is running well, apart from the awful noise. Any advice would be appreciated.