American Dryer Corp. Phase 5 Microprocessor AD-170 - Manual (Page 44)

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12. Display reads "dSFL". Dryer Sensor Circuit Failure.
A. Check 1/8 amp fuse on computer
B. Faulty microprocessor temperature sensor probe
C. Open circuit in either one of two (2) wires leading from the sensor probe to the computer
1) Connection at sensor bracket assembly connector
2) Connection at computer harness connector
D. Faulty microprocessor (computer) controller
13. Dryer does not start. Display reads "door".
A. Main door is open
B. Lint drawer is open
C. Faulty main door or lint door switch
D. Open circuit in either main door or lint drawer switch harnesses
E. Faulty 24 V transformer
14. There is excessive vibration coming from the basket.
A. Basket is out of adjustment
B. Loose or broken tie rod
C. Failed tumbler support