American Dryer Corp. AD-60 - Manual (Page 55)

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2. Impellor (fan/blower) is out of balance...
a. Excessive lint buildup on impellor (fan/blower).
b. Failed impellor (fan/blower).
3. Loose basket (tumbler) tie rod.
4. Basket is out of adjustment or adjustment bolts (hardware) are loose.
5. Failed basket (tumbler) support.
6. Loose motor mount.
7. Failed idler and/or basket (tumbler) bearings.
8. V-belt(s) either too tight or too loose.
U. Main burners are burning with a yellow flame (for gas models only)...
1. Burner air shutters are out of adjustment.
2. Insufficient make-up air.
3. Dust and/or lint in burner.
4. Insufficient gas pressure.
DUAL TIMER MODELS
A. Dryer will not start, both drive and blower motors are not operating (indicator light is off)...
1. Dryer control circuit fuse is blown.
2. Open at location, service main fuse or circuit breaker.
3. Failed “Push To Start” relay.
4. Failed door switch and/or circuit.
5. Failed heat timer.
6. Failed dual timer relay.
B. Drive motor (only) is not operating...
1. Failed drive motor contactor.
2. Failed reversing timer (for reversing models only).
3. Failed drive motor.