Lately my four years old Laars Mini Therm makes whining noise when it runs; especially at night when everything is quiet. Please sugest what most likely the cause ... Thanks
Pool & Spa - Sta Rite - STA-RITE CONTROL BOARD KIT - 42001-0096S
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Answers & Comments
Quite possibly a partially plugged heat exchanger either water side or gas side. The gas side would be soot deposits on the heat exchanger preventing the proper flow of comubstion gases from flowing out the vent, the water side would be scale build up on the inside of the heat exchanger.