Learn how your appliance is supposed to operate so you can determine if it is malfunctioning.
There have been numerous oven control systems used over the years. The following instructions describe various methods that might be employed to correct such a condition.
In almost all cases if the temperature reading is more than +/- 35°F out, some part of the control system will need to be replaced. Usually just an adjustment will not provide an adequate solution to the condition and may even make it worse.
Before attempting any kind of adjustment on a hydraulic oven control, make sure the thermostat's sensor bulb is properly mounted in the oven cavity and not touching the oven wall or metal rack. The sensor bulbs are held about 1/2" away from the oven wall by a small metal clip.
Some models have the calibration adjustment on the underside of the knob itself. On this type of arrangement, the loosening of the dial plate and moving it one way or the other will change the temperature reading on the dial once reinstalled. Other control designs have the temperature calibration screw down the center of the shaft. These usually require a special small screwdriver to access it. Still others have no field adjustment available at all.
The following procedures are designed to provide an general idea how calibration adjustment of the oven temperature display on many electronically controlled (ERC/EOC) ranges and ovens is done. The actual procedures vary from model to model so check your owner's manual.
If the temperature is out more than 35°F, the oven sensor or the electronic control may need to be replaced to correct the inaccuracy.
A flashing "OVEN" L.E.D. indicates a positive offset. A flashing "LOCK" L.E.D. indicates a negative offset. They will flash once for each 5°F of offset it has been programmed for. After the flashing sequence, it will pause and then repeat the sequence.
Example: If the "OVEN" L.E.D. flashes three times and then a pause, the offset is +15°F. If no "OVEN" or "LOCK" L.E.D. is flashing, the E.O.C. has the original factory preset.
The above procedure will not affect the broil or clean temperatures.
*A maximum offset adjustment of 30°F or 15°C is possible.
(To switch between Fahrenheit to Celsius, try pressing and holding the "broil" button for 5 seconds.)
Based on an article supplied by www.Appliance411.com. Visit their site for more helpful appliance repair articles and tips. Reprinted with permission.
All of the information in these Appliance Clinic procedures is provided FREE OF CHARGE. No liability is assumed by the author for the accuracy of the contents or damages caused by the use of these procedures.