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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Usually the temp sender/sensor, you can check it out of the unit via resistance, when cold it will be high and the warmer it gets the lower the resistance, if on a gauge it measures correctly then you will want to check the wiring to/from it and back to the controller. Testing the switch is sometimes easier to replace since of it's low cost to replace.
Thank you!- Joe
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