ADC AD-81 Service Manual page 43

4. Poor housekeeping. Dirty or clogged lint screen.
5. Extractors (washers) are not performing properly.
6. An exceptionally cold/humid or low barometric pressure atmosphere.
7. The supply gas may have a low heating value, check with local gas supplier.
8. Failed temperature sensor (temperature calibration is incorrect).
9. Failed microprocessor controller (computer).
I. Thermal overload for drive motor is tripping...
1. Either an exceptionally low or high voltage supply.
2. Motor bearing failure.
3. Bearing failure in drive system.
4. Motor vents are blocked with lint.
5. Failed motor.
6. Insufficient make-up air.
J. Overload for impellor (fan) motor is tripping...
1. Either an exceptionally low or high voltage supply.
2. Motor bearing failure.
3. Motor vents are blocked with lint.
4. Failed motor.
5. Failed overload.
6. Out of balance impellor (fan).
7. Insufficient make-up air.
K. Dryer is cycling on burner hi-limit safety thermostat...
1. Insufficient exhaust ductwork, size or restriction in exhaust system.
2. Insufficient make-up air.
3. Lint screen needs cleaning.
4. Damaged impellor (fan).
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