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CALIBRATION OF THERMOSTATS
Field recalibration is very seldom necessary on new appliances, however older thermostats may require
calibration. Recaibration should only be considered when cooking results definitely indicate the thermostat is not
maintaining the set temperature. Before attempting recalibration, the temperature should should be checked with
temperature test instrument or a reliable thermometer.
Standard Oven with FDTO Thermostat
1. Place the test instrument sensor or thermometer in the center of the oven cavity and close the door.
2. Turn oven on, set the thermostat dial to 300 degrees and allow the oven to cycle several times (at least
20 minutes).
3. Turn the thermostat dial back to the lowest temperature setting. Check the bypass flame; it should be
1
/8" tall. Adjust bypass as necessary (Diagram #9).
4. Turn thermostat dial back to 325°F and allow 5 minutes for temperature to stabilize. If temperature is more
than 20°F different from the dial setting, calibrate as follows.
A. Remove dial and loosen the calibration plate screws until the calibration plate moves freely. Gently
attach dial and turn until the dial setting matches the actual oven temperature (Diagram #9).
B. Hold calibration plate. Gently remove dial and tighten calibration plate mounting screws. Apply
adhesive material to calibration screws
C. Replace dial and increase temperature 50°F. Allow 10 minutes and recheck the temperature.
D. If temperature is still more than 20°F different from the dial setting, the thermostat may need to be
replaced.
DIAGRAM #10DIAGRAM #9
BYPASS SCREW
CALIBRATION SCREWS
CALIBRATION SCREW