American Dryer Corp. MDG-30 - Manual (Page 46)

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a. Lint screen and lint compartment are not being cleaned on a regular basis.
b. Lint accumulation in location exhaust system.
3. Insufficient make-up air.
4. Failed hi-limit thermostat.
5. Failed lint compartment automatic (225° F [107° C]) safety thermostat circuit.
6. Extractors (washers) are not performing properly.
7. Low or inconsistent gas pressure.
8. Gas supply may have low heating value.
9. Sail switch is fluttering...
a. Restriction in location exhaust system.
10. Exceptionally cold, humid, or low barometric pressure atmosphere.
11. Blower (impellor/fan) motor rotation direction is incorrect (3-phase [3ø] models only).
D. Dryer is cycling on hi-limit thermostat...
1. Blower (impellor/fan) motor failure.
2. Blower (impellor/fan) motor rotation direction is incorrect (3-phase [3ø] models only).
3. Insufficient make-up air.
4. Restriction in location exhaust system...
a. Undersized exhaust ducting.
5. Lint screen needs cleaning.
6. Failed hi-limit thermostat.