ADC Gas Electric Steam WDA-540 - Manual (Page 58)

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SECTION VIII
PHASE 5 COIN SYSTEM DIAGNOSTICS
ALL major circuits, including door, microprocessor temperature sensor, heat and motor circuits are monitored.
The Phase 5 coin microprocessor controller (computer) will inform the user via the light emitting diode (L.E.D.)
display of certain failure codes along with indicators both in the L.E.D. display and at the outputs of each relay
(and door switch circuit) to easily identify failures.
A. DIAGNOSTIC (L.E.D.) FAILURE CODES
1. “door” - Indicates door 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 microprocessor controller [computer]).
2. “dSFL” - Indicates a fault in the microprocessor temperature sensor circuit. 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.
a. the problem is corrected
or
b. power to dryer is discontinued...and the problem is then corrected.
IMPORTANT: The Phase 5 coin microprocessor controller (computer) has its own internal heat
sensing circuit fuse protection located on the back side of the (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) type fuse.
NOTE: Once the Phase 5 coin microprocessor controller (computer) detects a problem in the heat
circuit, it updates every 30-seconds so if a problem was a loose connection in this circuit,
which corrected itself, the “dSFL” condition would automatically be cancelled.