Dexter Laundry DDAD T-30 2 Series Administrator guide

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DDAD T-30X2 Models
30 Pound Stacked Commercial Dryer
Troubleshooting, Fault codes, And Schematics

Trouble Shooting
Electronic Control Diagnostic Lights
The electronic control has 6 diagnostic lights to aid in service of the dryer. Each pocket has indicator
lights for the motor circuit, door switch circuit, and the heat circuit. When the electronic control is carefully
unlocked and moved forward these lights are visible on the circuit board. They are each labeled as to
function indicated.
1. When either dryer door is closed, the appropriate door light on the computer should be illuminated
indicating that the door is closed.
2. When either dryer is running, the appropriate motor light on the computer should be illuminated
indicating that the computer is calling for the motor to operate.
3. When either dryer is calling for heat, the appropriate heat light on the computer should be
illuminated indicating that the computer is calling for heat.
An example of their function would be troubleshooting an upper dryer pocket that did not heat.
1. Start the machine and insure that it did not heat.
2. Check the upper heat light and see if it is lit.
3. If the heat light is on, this would indicate that the computer was calling for heat and that it was not
at fault. You would then go on to check the rest of the heat circuit.
Electronic Control Test Cycle
This test cycle allows the dryer to run for 5 minutes without the need for adding money while servicing. To
actuate this 5 minute test cycle leave the loading doors closed, unlock the computer and push the program
button on the right front corner of the computer as if you were putting it into the program mode. This will
give a 5 minute cycle on both tumblers for evaluating the machine.
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Trouble Shooting Fault Codes
F1 Shorted sensor or shorted sensor wire harness
F2 Open sensor or sensor wire harness disconnected
F3 Possible grounding problem. Try powering down and repowering and then push programming
button to start dryer. Try resetting with Palm Pilot (extra utilities file). If no success. Try
removing battery and reinstall battery.
F4 Micro Chip Problem. Replace controller.
F5 Microchip Electrical Problem. Remove power for 1 minute and then power on. Try removing
battery and reinstalling on control PCB/
TROUBLESHOOTING TIPS
Symptom Probable Cause Suggested Remedy
Tumbler does not turn Drive belts Check both drive belts.
Replace if failed.
Drive motor Check capacitor and motor.
Replace if failed
Door switch Check door switch contacts
and adjustment. Adjust or
replace door switch.
Electronic Control Is electronic control closing
motor relay to power drive
motor? Check for motor light
on electronic control. If no
light change control. If light is
on, check voltage and wiring
to motor.
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Symptom Probable Cause Suggested Remedy
Tumbler turns but
no spark at burner
Glass fuse Check small glass control fuse in back of dryer. Replace
if failed.
Temperature Sensor The temperature sensor should have between 30,000
ohms and 60,000 ohms resistance at room temperature if
okay. Replace if not in this range.
Ignition Check for 24VAC output from transformer.
Transformer Replace if have 120V between black & white and no 24V
between red and yellow.
Over temperature Check to see if manually resettable thermostat.
Thermostat is kicked out. Reset by pushing red reset
button.
Ignition control Check for 24VAC coming into the control on the at
burner red wire. If voltage, then check for 24VAC out on
the brown wire. Also check for spark at the ignitor. If no
24VAC output or no spark to the ignitor, replace ignition
control.
Air Flow Switch Check air flow switch to be sure it closes when dryer is
running. If not, adjust or replace switch.
Hi-limit Check for continuity. Should be 0 ohms resistance when
cold. If not, replace thermostat.
Gas supply No gas can cause system lockout
Electronic Control Is electronic control closing gas relay to power Control
heat circuit? Check for gas light on electronic control. If
no light change control. If light is on, check voltage and
components in heat circuit at transformer at rear of unit.
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Symptom Probable Cause Suggested Remedy
Tumbler turns,
ignition sparks, no
flame
Gas supply Make sure gas supply is working.
Gas pressure Make manometer check of gas pressure. Adjust if
necessary.
Spark Electrode Sensor Check for damage to electrode or mounting.
Replace if necessary.
Gas valve Check coil continuity, replace valve if failed.
Ignition Control Check for 24VAC to gas valve coils. If no voltage
replace ignition control.
Burner Lights, but
goes on and off
Electrodes Check low voltage harness for possible wire break
or cuts to allow no signal back to ignition control
Slow drying Temperature Setting Check program for correct high temperature
setting. Adjust if necessary.
Air flow restrictions necessary 1. Check lint screen and clean if necessary.
2. Check exhaust for correct length and clean if
necessary.
3. Check exhaust damper to insure that it opens
when dryer is running and closes when dryer is
not in use.
4. Check makeup air to insure that it is adequate.
Increase makeup air if necessary.
5. Check static Back pressure no more than .3
Temperature Sensor The temperature sensor should have between
30,000 ohms and 60,000 ohms resistance at room
temperature if okay. Replace if not in this range.
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Symptom Probable Cause Suggested Remedy
Erratic display Initial Start-up If erratic on initial start-up, leave power on for
approximately one hour and check machine
operation again.
Grounding Machine must be grounded by separate conductor
back to neutral bar in breaker box.
Program Check program and make corrections if
necessary.
Voltage spike Power down machine for 20 seconds and
repower. If no improvement, replace control.
Manual overtemp
Tripping Frequently
Recirculating
chamber Lint
Accumulation
Remove manual overtemp thermostat and inspect
in chamber for excessive lint build up. Access also
gained to this chamber by removing recirculation
duct mounted at bottom of chamber, or the panel
inside burner chamber between burners and rear
back panel
Exhaust ducting
Excessive lint buildup
Remove exhaust duct at rear of dryer and inspect
for excessive lint build up in complete duct from
dryer to where duct exits building.
Clean linto of of top
heat air chamber
above tumbler
Remove front panel completely. Be careful of any
wiring attached. Remove heated air chamber
cover and clean above tumbler back to burner
housing.
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Wiring Schematic for DDAD Dryer
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Wiring Diagram for DDAD Dryer
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