I have new a Laars Minitherm JV225NDISU2 natural gas forced hot water boiler with six zones of baseboard. About ten times a day it makes a loud whistling sound for about 5-10 seconds. It sounds like air escaping from a balloon. You can hear the sound throughout the house and from two floors above. I think it would wake someone sleeping in the basement.
The sound is hard to localize but I think it is coming from the boiler pump. The boiler installer replaced the pump with one twice as big and also lowered the boiler temperature. Both actions reduced the frequency and duration of the whistles but have not eliminated it. Do you have any ideas as to causes and remedies?![]()
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