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    Lassleesa's Avatar
    Lassleesa Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Apr 30, 2008, 03:51 AM
    Mears Thermostat Model M 70 - whining!
    Mears thermostat looks like model M70 or 7D - double line break.. in new rental unit making a head splitting high pitched whining noise every time heat is called for. It's an oldie. When I tap the metal sheet insisde the outer face plate it stops. Resumes again next time heat is called for.
    Does she need to be replaced?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Apr 30, 2008, 02:14 PM
    You might test to see how many amps are going through the thermostat to see if it is overloaded. Then if that is OK I would replace the thermostat.
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