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Really bad whining noise when gas valve is open

SergeBKSergeBK Member Posts: 1
Hello everyone. I have a 30 year old laars mini-therm boiler 50000BTU with 2 zones and a single pump, last year i noticed a faint whining noise coming out when boiler is firing, now that noise is driving my wife crazy and therefore i am going crazy. Initially i thought its the pump, but when boiler is at 160F and gas valve is off i can hear the pump turning without any issues while T-stat is calling for heat. Is it possible for the gas valve to make that type of noise or am i dealing with dirty burners


  • ZmanZman Member Posts: 4,567
    I suspect you are hearing microflashes in the heat exchanger caused by low water flow or internal scaling.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
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