You will have to check the thermistor as well as the rest of the sensor. Make sure the gas is off and the unit is unplugged befor you open the back of the unit. If the sensors test good than you may have a bad heating coil unit. All the parts can be tested for free at your local appliance parts supplier.
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https://www.6ya.com/expert/joshua_ac64e182ed26f66d
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