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The control board rarely if ever fails---it sounds like your thermistor sensor has likely failed. If you really wanted to test the the sensor, look for the white plastic bullet at the top of the silver evaporator coils with 2 small wires going to it. You'd need to cut the wires going to the sensor and then put the sensor in ice water for 5 minutes. The resistance should be right around 16.3 kΩ. If not then the sensor would need to be replaced.
If for some reason the sensor checks good---replace the control board.
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The thermistor is not the same as the thermostat. The thermostat is a 1" round device---the thermistor is a 1" white plastic bullet device. But to check resistance, you'd need a multimeter. Below is a link to the thermistor
CLICK HERE for thermistor
You have to cut the wires, then you have to turn your multimeter to a resistance setting but I don't know what that is on your multimeter. Then you need to strip the wires back on the sensor and place one lead on one wire and the other lead on the other wire coming from the sensor to check the resistance through the sensor.
But again, the part is only about $10 so I don't even think it's worth testing---just order and replace it and if you still have an issue then replace the control board.
Sure thing. I'm usually around on and off all day long depending on if I'm out running a call or not.
No that sounds like it's within range so if that's the case then you need to replace the main control board.
You can test continuity through the heater and through the defrost thermostat when the thermostat is clipped onto the coil and the coil has been frosted for at least 15 minutes. If both of those check good and the thermistor checks good---the control board is the only thing left and that part itself can't be tested.
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?