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SECTION VI
PHASE 5 DUAL MICROPROCESSOR CONTROLLER (DMC)
SYSTEM DIAGNOSTICS
ALL major circuits, including door, lint drawer, microprocessor temperature sensor, heat and motor circuits are
monitored. The Phase 5 DMC computer will inform the user, via the light emitting diode (L.E.D.) display and at
the outputs of each relay (and door switch circuit) to easily identify failures.
A. DIAGNOSTIC (L.E.D. DISPLAY) FAILURE CODES
1. “dOOr” - indicates door or lint drawer switch circuit is open.
a. Keyboard (touch pad) entry was made while main door is open or
b. There is a fault in the door switch circuit (external of the Phase 5 DMC computer).
2. “dSFL” - indicates a fault in the microprocessor temperature sensor circuit.
a. If a fault is detected in the microprocessor heat sensor circuit, the L.E.D. display will read “dSFL” and
the buzzer (tone) will sound for approximately 5 seconds every 30 seconds until...
1) problem is corrected or
2) power to the dryer is discontinued...and the problem is then corrected.
IMPORTANT: The Phase 5 DMC computer has its own internal heat sensing circuit fuse protection
located on the back side of the Phase 5 DMC computer. If a “dSFL” condition
occurs, check to see if this fuse has blown. If it has, DO NOT replace the entire
microprocessor controller (computer). Replace only the fuse and do so only with a
1/8-amp (Slo-Blo) fuse only.
NOTE: Once the Phase 5 DMC computer detects a problem in the heat circuit, it updates every
30-seconds, so if the problem was a loose connection in this circuit which corrected itself, the
“dSFL” condition would automatically be cancelled.
3. “SEFL”
a. Indicates rotational sensor circuit failure, meaning that there is a fault somewhere in the basket (tumbler)
rotation detection circuit that the Phase 5 DMC computer program related to this circuit (PL01) is set
incorrectly in the active mode (“SEn”) where the dryer is not equipped with the optional rotation sensor
and should be set in the inactive mode (“nSEn”).
NOTE: If the dryer is equipped with the rotational sensor and the display reads “SEFL,” reset by
closing and opening the Program Switch (PS). Restart the dryer and if the “SEFL” code
appears again, investigate further.