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Re: duo-therm quick cool
Your compressor is trying to restart after it shuts off which is causing a power draw down changing the sound of the fan speed change. Check voltage power supply and insure that the power supply cord is heavy enough to carry the necessary load.
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`Try changing the breaker some times they get weak and will trip at start up. Also check for bare wire shorting out. Then check capacitor then fan motor spin blades to see if they spin easy and that bearings are not bad.. make sure all connections are tight with no corrosion. These problems show up more with short cycling then with long.
Sounds like thermostat is failing. There is a factory set resistor that helps the thermostat keep a 2 degree accuracy. Second possibility is that you have a fan or direct airflow from the cooling system, being devirted, that is allowing the cool air hit the thermostat on the wall.
bad compressor relay on control board. The relay is not opening the circuit, allowing the compressor to stay running when unit is turned off. This overheats the compressor and opens a thermal disk shutting the compressor off. When thermal disk cools down, the compressor restarts under load and trips breaker.