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Lassleesa
Apr 30, 2008, 03:51 AM
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
Apr 30, 2008, 02:14 PM
You might test to see how many amps are going thru the thermostat to see if it is overloaded. Then if that is OK I would replace the thermostat.