ADC AD-333 Service Manual page 18

F. Dryer operates, probe sparks, but gas does not flow...
1. Dryer gas shutoff valve is closed.
2. Failed gas valve (open coil in valve).
3. Loose wiring connection from DSI module to gas
valve. (Check voltage at gas valve).
4. Failed DSI module.
G. Dryer operates, probe sparks but there is no ignition even
though gas is evident...
1. Gas pressure is too low. Check manifold pressure
and take necessary corrective action.
2. Ignitor probe is out of adjustment (readjust within gas
flow).
3. Lint accumulation in burner tubes.
H. Dryer operates but is taking too long to dry...
1. An inadequate exhaust ductwork system.
2. Restriction in exhaust system.
3. Insufficient make-up air.
4. Poor housekeeping. Dirty or clogged lint screen.
5. Extractors (washers) are not performing properly.
6. An exceptionally cold/humid or low barometric
pressure atmosphere.
7. The supply gas may have a low heating value, check
with local gas supplier.
8. Failed temperature sensor (temperature calibration
is incorrect).
9. Failed microprocessor controller (computer).
I. Thermal overload for drive motor is tripping...
1. Either an exceptionally low or high voltage supply.
2. Motor bearing failure.
3. Bearing failure in drive system.
4. Motor vents are blocked with lint.
5. Failed motor.
6. Insufficient make-up air.
J. Dryer is cycling on burner hi-limit safety thermostat...
1. Insufficient exhaust ductwork, size or restriction in
exhaust system.
2. Insufficient make-up air.
3. Lint screen needs cleaning.
4. Damaged impellor (fan).
K. Display reads "dSFL," dryer sensor circuit failure...
1. Check 1/8-amp fuse on computer.
2. Faulty microprocessor temperature sensor probe.
3. Open circuit in either one (1) of two (2) wires leading
from the sensor probe to the computer.
a. Connection at sensor bracket assembly connector.
b. Connection at computer harness connector.
4. Faulty microprocessor controller (computer).
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L. Dryer does not start. Display reads "door"...
1. Main door is open.
2. Lint drawer is open.
3. Faulty main door or lint door switch.
4. Open circuit in either main door or lint drawer switch
harnesses.
5. Faulty 24V transformer.
M. There is excessive vibration coming from the tumbler...
1. Tumbler is out of adjustment.
2. Loose or broken tie rod.
3. Failed tumbler support.
Electrical Troubleshooting ____________
The information provided will help isolate the most probable
components associated with the difficulty described. The
experienced technician realizes, however, that a loose
connection or broken or shorted wire may be at fault where
electrical components are concerned, not necessarily the
suspect component itself.
ELECTRICAL PARTS SHOULD ALWAYS BE CHECKED FOR
FAILURE BEFORE BEING RETURNED TO THE FACTORY.
The information provided should not be misconstrued as a
device for use by an untrained person in making repairs. Only
properly licensed technicians should service the equipment.
OBSERVE ALL SAFETY PRECAUTIONS DISPLAYED ON
THE EQUIPMENT OR SPECIFIED IN THIS MANUAL WHILE
MAKING REPAIRS.
Phase 5 System Diagnostics
All major circuits, including door, microprocessor temperature
sensor, heat and motor circuits are monitored. The Phase 5
microprocessor controller (computer) will inform the user, via
the L.E.D. display, of certain failure codes, along with
indicators both in the L.E.D. display and the outputs of each
relay, (and door switch circuit) to easily identify failures.
Diagnostic (L.E.D. Display) Failure Codes
"door" – Indicates door switch circuit is open.
Touchpad entry was made while main door or lint drawer is
open, or
There is a fault in the door switch circuit (external of the Phase
5 microprocessor controller [computer]).
"dSFL" – Indicates a fault in the microprocessor temperature
circuit.
If fault is detected in the microprocessor heat sensor circuit,
the display will read "dSFL," and the tone (buzzer) will sound
for approximately 5-seconds every 30-seconds until...
The problem is corrected, or
Power to the dryer is discontinued and the problem is then
corrected.
American Dryer Corp. 450374 - 1