American Dryer Corp. AD-60 - Manual (Page 57)

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3. Tripped lint compartment manual reset (225º F [107º C]) safety hi-limit thermostat.
4. Failed oven contactor/relay.
5. Failed heat selector switch.
STEAM MODELS ONLY
1. Steam damper binding and/or stuck.
2. Tripped lint compartment manual reset (225º F [107º C]) safety hi-limit thermostat.
3. Failed heat selector switch.
G. Heat unit is not operating for only one (1) temperature selection...
1. Failed thermostat corresponding to selection made.
2. Failed heat selector switch.
H. Dryer operates but is taking too long to dry load...
1. Heating unit cycling on hi-limit thermostat (for electric models only).
2. Steam damper binding in partially open position (for steam models only).
3. Lint and/or dust accumulation on steam coil fins (for steam models only).
4. Housekeeping...
a. Lint screen and lint compartment are not being cleaned on a regular basis.
b. Lint accumulation in location exhaust system.
5. Insufficient make-up air.
6. Extractors (washers) are not performing properly.
7. Low and/or inconsistent gas pressure (for gas models only).
8. Gas supply may have low heating value (for gas models only).
9. Sail switch is fluttering (for gas and electric models only)...
a. Restriction in location exhaust system.