Maytag MDG-30 - Manual (Page 46)

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S. Main burners are burning with a yellow flame
1. Burner air shutters are out of adjustment.
2. Insufficient makeup air.
3. Dust or lint in burner.
4. Insufficient gas pressure.
MECHANICAL COIN MODELS
A. Heating unit not operating (ALL temperature selections)
1. Fault in sail switch circuit
a. Sail switch out of adjustment or failed.
b. Sail switch not closing or fluttering
1) Check blower (impellor/fan) motor and rotation direction.
2) Restriction in location exhaust system.
2. Failed burner hi-limit circuit.
3. Failed lint compartment automatic (225 º F [107 º C]) safety thermostat circuit.
4. Failed heat selector switch.
B. Heat unit not operating for only one (1) temperature selection
1. Failed thermostat corresponding to selection made.
2. Failed heat selector switch
C. Dryer operates but is taking too long to dry load
1. Heating unit cycling on hi-limit thermostat
2. Housekeeping
a. Lint screen and lint compartment not being cleaned on a regular basis.
b. Lint accumulation in location exhaust system.
3. Insufficient makeup air.
4. Failed hi-limit thermostat
5. Failed lint compartment automatic (225 º F [107 º C]) safety thermostat circuit.
6. Extractors not performing properly.
7. Low or inconsistent gas pressure