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Thermador Oven Temperature Not Accurate

PRG366GH/09

The part(s) or condition(s) listed below for the symptom Oven temperature not accurate are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for Oven temperature not accurate

Cause 1Igniter

The igniter draws electrical current through the gas valve to open it. As the igniter weakens over time, it takes longer to open the gas valve. As a result, the oven temperature will drop too low before the burner reignites. The oven temperature should not drop more than 40 degrees Fahrenheit before the igniter relights the burner.

Part Testing
Parts
Igniter for your ThermadorRange/Stove/Oven
Igniter - Part # 1107469 Mfg Part # 00492431

Bake igniter assembly with wire harness and push-on wire terminal ends. Also used for grill or griddle burner ignition. The igniter is the most commonly defective part for a gas oven not heating correctly or at all.

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Cause 2Temperature Sensor

The oven sensor works in conjunction with the oven control board to regulate the temperature. The sensor regulates the oven temperature by varying its resistance to electrical current as the oven temperature varies. As the oven temperature rises, the oven sensor creates greater resistance. If the sensor gives the wrong amount of resistance, the oven may not bake evenly. On some models, you can recalibrate the oven control up to 35 degrees Fahrenheit higher or lower. Refer to your owner’s manual for instructions on how to recalibrate the oven control.

Part Testing
Parts
Temperature Sensor for your ThermadorRange/Stove/Oven
Temperature Sensor - Part # 2629368 Mfg Part # 00627375
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Cause 3Oven Control Board

The oven control board works in conjunction with the oven sensor to regulate the temperature. The sensor regulates the oven temperature by varying its resistance to electrical current as the oven temperature varies. As the oven temperature rises, the oven sensor creates greater resistance. If the sensor gives the wrong amount of resistance, the oven may not bake evenly. Or if the oven control board does not read the sensor resistance correctly, the oven temperature may be inaccurate. On some models, you can recalibrate the oven control up to 35 degrees Fahrenheit higher or lower. Refer to your owner’s manual for instructions on how to recalibrate the oven control.

Parts
Oven Control Board for your ThermadorRange/Stove/Oven
Oven Control Board - Part # 1560602 Mfg Part # 00619016

Control board assembly

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Cause 4Convection Motor

In a convection oven, the convection motor drives the convection fan to circulate the air inside the oven. If the convection fan isn't circulating the air, the oven won't bake evenly. Try turning the convection fan blade by hand. If the blade is hard to turn, this may indicate that the motor bearings are worn. If the motor bearings are worn, you will have to replace the convection motor. To determine if the motor is defective, use a multimeter to test it for continuity. If the motor does not have continuity, replace it.

Parts
Convection Motor for your ThermadorRange/Stove/Oven
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