Is the thermostat on an inside or outside wall? Is it close to the door? What is the outside temp? Do you have another thermometer to compare the thermostat reading to?
If you have water in the FW tank and it's coming out with the pump I would worry about the sensor reading.
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Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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