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c. Hold the knob and carefully tighten the setscrew. d. Recheck the thermometer/pyrometer reading against the thermostat knob setting the next time the burner lights. e. Repeat steps 3.a. through 3.d. until the thermometer/pyrometer reading and knob setting agree within ± 5.F (2.C). If calibration cannot be obtained for any reason, call a Factory Authorized Service Center for assistance. 5. Remove the thermometer or pyrometer. Check Computer Magic III.5 Set Point Accuracy (This check applies onl