Maytag MDG-30 - Manual (Page 47)

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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 and fan) motor rotation direction is incorrect. (3 phase models only)
D. Dryer is cycling on hi-limit thermostat
1. Blower (impellor and fan) motor failure.
2. Blower (impellor and fan) motor rotation direction is incorrect. (3 phase models only.)
3. Insufficient makeup air.
4. Restriction in location exhaust system
a. Undersized exhaust ducting.
5. Lint screen needs cleaning.
6. Failed hi-limit thermostat.