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I'm having problems with a whistling sound coming from my boiler, shortly after the burner ignites in the morning, and now in the evenings as well. I have a Powermax 140 Open Vent model. It started with a leak, that ruined most of my hallway - I took the cover off and tightened a...

I am experiencing this problem also. It is happening to me at night as well, though, or shortly after the burner light comes on. I have a Powermax 140 Open Vent model. It started with a leak, that ruined most of my hallway - I took the cover off and tightened a screwthread where it was...