TROUBLE SHOOTING for
ADC dryer AD - 330/ AD - 320

Please, check below information to test your boards.

IMPORTANT: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE TEAM SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUSTING, INSTALLIATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS.

The information provided will help isolate the most probable component(s) associated with the difficulty described. The experienced technician realizes, however, that a loose connection or broken/ shorted wire may be at fault where electrical components are concerned ¡¦ and not necessarily the suspected 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 handbook for use by an untrained person making repairs.

IMPORTANT: When Replacing blown fuses, the replacement must be of the exact as the fuse being replaced

WARNING: ALL SERVICE and TROUBLE SHOOTING SHOULD BE PERFORMED BY A QUALIFIED PROFESSIONAL OR SERVICE AGENCY.

WARNING: WHILE MAKING REPAIRS, OBSERVE ALL SAFETY PRECAUTIONS DISPLAYED ON THE DRYER or SPECIFIED IN THIS MANUAL.

A. NO L.E.D. Display ¡¦
1. Service panel fuse blown or tripprd breaker.
2. Blown control circuit fuse (3AG 1/2-Amp[Slo Blo] Fuse)..
3. Failed Dual Microprocessor Controller (DMC) computer.
B. Basket (tumbler) does not motor and DMC computer motor L.E.D. dot and motor output L.E.D indicators are on¡¦
1. Dual Microprocessor Controller(DMC) computer indicator is on ¡¦
a. Failed motor contactor / relay.
b. Failed motor.
2. Dual Microprocessor (DMC) computer indicator is off (and the L.E.D. display does not read ¡°door¡±) ¡¦
a. Failed Dual Microprocessor Controller (DMC) computer.

C. Basket (tumbler) does not turn but motor and DMC computer motor L.E.D. dot and motor output L.E.D. indicators are on ¡¦
1. Loose tumbler/basket belt (check tension/adjustment).
2. Tumbler/basket belt jumped off of motor or idler shaft
3. Broken tumbler/basket belt.

D. The dryer will not stop, even with no cycle (L.E.D. display reads ¡°FILL¡±) in progress ...
1. Failed motor contactor/relay

E. The dryer operates for a few minutes, and with the DMC computer motor L.E.D. indicator dot on the motor stops, and then after
a period of time restarts on its own ¡¦
1. Motor is overheating and tripping out on it¡¯s internal overload ¡¦
a. Motor air vents clogged with lint.
b. Low voltage to motor.

F. The Dryer operates for a few minutes and then stops ¡¦ DMC computer L.E.D. display continues to read cycle in progress, indicator dots are off and dryer can be restarted by pressing selection key ¡¦
1. Intermittent connection in main door/lint drawer circuit.
a. Main door switch or lint drawer switch out of proper adjustment
b. Loose connection in main door switch or lint drawer switch wiring.
c. Failed main door switch or lint drawer switch.

G. The dryer does not start, and the DMC computer L.E.D. display reads ¡°door¡±¡¦
1. Dual Microprocessor controller (DMC) ¡°door¡± input L.E.D. is off ¡¦
a. Main door and/or lint drawer is properly closed
b. Failed main door switch.
c. Failed lint drawer switch.
d. Open circuit (broken wire and/or termination) in main door switch circuit wiring or lint drawer switch circuit wiring.
e. Failed 24VAC step down transformer.
2. Dual Microprocessor Controller (DMC) ¡°door¡± input L.E.D. is on ¡¦
a. Failed Dual Microprocessor Controller (DMC) computer.

H. The dryer does not start (COIN MODELS ONLY)¡¦coin(s) inserted and the L.E.D. display continues to read ¡°FILL¡± and/or ¡°Amount to Start¡± (does not read ¡°PUSH¡±)¡¦
1. Coin acceptor is not adjusted properly (housing is not flush with panel) or it¡¯s dirty with lint.
2. Failed coin acceptor optic switch
3.Parameter in program location 01 (PL01) set incorrectly.
a. Bad coin program should be set for ¡°bCrS¡± and not ¡°bCLO¡±

I. DMC computer L.E.D. display reads ¡°dSFL¡± ..
1. L.E.D. display consistently reads ¡°dSFL¡± and will not clear ¡¦
a. Dual microprocessor Controller (DMC) computer 1/8-Amp (Slo Blo) fuse is blown.
b. Failed Dual microprocessor Controller (DMC) computer temperature sensor.
c. Broken wire and/or termination in sensor harness somewhere between the sensor bracket and the Dual Microprocessor Controller (DMC) computer.
2. L.E.D. display reads ¡°dSFL¡± for a short period of time (30seconds or less) and then return to the normal stop ¡°FILL¡± mode ¡¦

NOTE: Once the dual microprocessor (DMC) computer detects a problem, it updates every 30 seconds so that if
a problem was a loose connection in this circuit which corrected itself, the ¡°dSFL¡± display condition would automatically be canceled.

a. loose wire and/or termination in sensor harness somewhere between the sensor bracket and the Dual Microprocessor Controller (DMC) computer.
b. Failed Dual Microprocessor Controller (DMC) computer temperature sensor.


J. DMC computer L.E.D. display reads ¡°Hot¡± ¡¦
The ¡°Hot¡± display condition indicates a possible overheating condition. The Dual Microprocessor Controller (DMC) computer monitors the temperature in the dryer at all times. If the DMC computer detecs that the temperature in the dryer has exceeded 170 F (77 C), it will disable ALL
of the dryer outputs(shut the dryer down), the buzzer (tone) will sound for approximately 5 seconds, and the L.E.D. display will read ¡°Hot¡
The L.E.D. display will continue to read ¡°Hot¡± until the temperature has dropped to 170 F (77 C) or lower and the DMC computer
is manually reset by closing and opening the Program Switch(PS).

Possible reason for overheating ¡¦
1. Restriction in location exhaust duct work ¡¦
a. Dryer exhaust damper stuck in closed position.
b.Undersized exhaust duct work.
2. Insufficient make-up air.

K. DMC computer L.E.D. display reads ¡°STEFL¡±¡¦
The ¡°SEFL¡± display condition indicates a rotational sensor circuit failure which means that there is fault somewhere in the basket (tumbler) rotation detection circuit ¡¦ or ¡¦ the Dual Microprocessor Controller (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 non-active mode(¡°nSEn¡±).

If the dryer is equipped with the optional rotational sensor and for whatever reason the Dual Control Microprocessor(DMC) computer detects that the basket (tumbler) is not turning, it will disable ALL of the dryer output (shut the dryer down), and the L.E.D. display will read ¡°SEFL¡±. The L.E.D. display will continue to read ¡°SEFL¡± until the Dual Microprocessor Controller (DMC) computer is manually reset by closing and opening the Program Switch (PS)

Possible causes¡¦

1. Loose/slipping (out of proper adjustment) basket/tumbler belt
2. Broken basket/tumbler V-belt.
3.Failed motor (refer to Item B and Item E ).

4. Failure in the rotational sensor circuit ¡¦
a. Failed rotational sensor.
b. Loose connection or break between the rotation sensor and the Dual Microprocessor Controller (DMC) computer

L. DMC computer will not accept any, or only accept certain keyboard (touchpad) entries ...
1. Failed keyboard (touchpad) label assembly.
2. Failed Dual Microprocessor Controller (DMC) computer.

M. DMC computer locks up and L.E.D. display reads erroneous message(s) or only partial segments ¡¦
1. Transient power voltage (spikes) ¡¦ disconnect power to the dryer, wait one(1) minute (NOTE: for dryer models with the optional battery back-up
¡¦ disconnect battery), then reestablish power to the dryer. If a problem is still evident, proceed to Item M2, Item M3, and Item M4.
2. Failed keyboard (touchpad) label assembly.
3. Improper grounding of the dryer or the Dual Microprocessor Controller (DMC) computer ground connections to the panel or the dryer are not
proper.
4. Failed Dual Microprocessor Controller (DMC) computer.

N. Dryer stops during a cycle and the DMC computer L.E.D. display returns to ¡°FILL¡±
If the dryer is equipped with optional battery back-up ¡¦
1. Refer to Item M1, ItemM3, or Item M4
If the dryer is not equipped with optional battery back-up ¡¦
1. Loose connection somewhere in the power source to the dryer.
2. Loose connection in main power circuit to the Dual Microprocessor Controller (DMC) computer.
3. Improper grounding of the dryer or the Dual Microprocessor Controller (DMC) computer ground connections to the panel or the dryer are not
proper.
4. Failed Dual Microprocessor Controller (DMC) computer.

O. Heating unit is not operating (no heat) ¡¦ both DMC computer heat indicator dot and ¡°HEAT¡± indicator are on ¡¦ but no spark at burner are
when the dryer is first started ¡¦
1. Failed Dual Microprocessor Controller (DMC) computer.
P. Gas heating unit is not operating (no heat) ¡¦ both DMC computer heat indicator dot and ¡°HEAT¡± indicator are on ¡¦ but no spark at burner area
when the dryer is first started ¡¦
1. Fault in sail switch circuit ¡¦
a. Sail switch is out of adjustment or has failed.
b. Sail switch damper is not closing or is fluttering ¡¦
1) Lint drawer/screen is dirty or clogged.
2) Restriction in exhaust duct work.
2. Fault in burner hi-limit circuit or thermostat.
3. Fault in Basket (tumbler) hi-limit circuit or thermostat.
4. Failed Direct Spark Ignition (DSI) module (burner control).
5. Failed Direct Spark Ignition (DSI) ignition and/or flame-probe assembly.

Q. No hear (GAS MODELS ONLY) ¡¦ ignitor sparks but there is no flame at burner ¡¦
1. Direct Spark Ignition (DSI) ignitor probe out of adjustment.
a. Reposition ignitor assembly closer to the burner ribbon are. Also check to make sure ribbon is flush all around the top of the burner tube (ribbon
Should not stick up at any are)
b. Check gap between ignitor assembly and top of the burner. Gap must be set 1/8¡± + 1/32¡±.
2. Failed ignitor flame-probe assembly or problem with wiring connections to the assembly.
3. No gas (check shut off valves) or insufficient (low Water Column [W.C.] pressure) gas supply.
4. Failed Direct Spark Ignition (DSI) module.
5. Failed gas valve.

R. No heat (GAS MODELS ONLY)¡¦ ignitor sparks, burner goes on and off right away ¡¦
1. DSI flame sensor (probe) out of adjustment ¡¦ reposition closer to the flame are.
2. Failed Direct Spark Ignition (DSI) flame sensor (probe)
3. Sail switch is fluttering ¡¦
a. Lint drawer/screen is dirty or clogged.
b. Restriction in exhaust duct work.
4. Insufficient make-up air.
5. Failed Direct Spark Ignition (DSI) module

S. No heat (ELECTRIC MODELS ONLY) ¡¦ both the DMC computer heat indicator dot and ¡°HEAT¡± output L.E.D. indicator are on ¡¦ but
electric oven is not operating ¡¦
1. Fault in sail switch circuit ¡¦
a. Sail switch is out of adjustment or has failed.
b. Sail switch damper is not closing or its fluttering.
1) Lint drawer/screen is dirty or clogged.
2) Restriction in exhaust duct work.
2. Fault in oven hi-limit circuit or thermostat.
3. Fault in basket (tumbler) hi-limit circuit or thermostat.
4. Failed oven contractor.
5. Failed oven electric element.

T. No heat (STEAM MODELS ONLY) ¡¦ both the DMC computer heat indicator dot and ¡°HEAT¡± output L.E.D. indicator are on ¡¦ but steam
damper system is not operating ¡¦
1. Fault in basket (tumbler) hi-limit circuit or thermostat.
2. NO external compressed air to steam damper (80 PSI required).
3. Steam damper is stuck or damper system air flow control valve not adjusted properly.
4. Failed steam damper 24VAC pneumatic solenoid switch.
5. Failed steam damper piston.

U. Dryer operates, but is taking too long to dry ¡¦
1. Exhaust duct work run is too long or is undersized ¡¦ back pressure cannot exceed 0.3 inches Water Column (W.C.)
2. Low and/or inconsistent gas pressure (GAS MODELS ONLY).
3. Insufficient make-up air.
4. Poor air/gas mixture at burner (GAS MODELS ONLY) ¡¦ yellow or poor flame pattern. Adjust gas burner air adjustment shutters.
5. Lint drawer/screen not being cleaned out on a regular basis or often enough.
6. Extractors (washers) not performing properly.
7. Sail switch is fluttering¡¦restriction in exhaust (GAS MODELS ONLY).
8. Failed Dual Microprocessor controller (DMC) computer temperature sensor ¡¦ temperature calibration is inaccurate.
9. Failed Dual Microprocessor Controller(DMC) computer ¡¦ temperature calibration is inaccurate.
10. Failed burner/oven hi-limit (GAS and ELECTRIC MODELS ONLY) ¡¦
11. Failed basket (tumbler) hi-limit thermostat.
12. Steam damper system not functioning properly (STEAM MODELS ONLY).
a. Steam damper is sticking closed or is not adjusted properly.
b. Leak in pneumatic (air) system.
13. Failed electric element (ELECTRIC MODELS ONLY).
14. Lint accumulation in location exhaust system.

V. Condensation on main door glass ¡¦
1. Too long, undersized, or improperly installed duct work.
2. Exhaust back draft damper is stuck closed or partially closed.
3. Restriction in exhaust duct work.

W. Dryer is making scraping noise at basket (tumbler) area¡¦
1. Check for object(s) caught in the basket (tumbler) wrapping area.
2. Basket (tumbler) is out of proper alignment ¡¦
a. Check both the vertical alignment and lateral alignment.
b. Check gap between the front panel and the basket (tumbler) front ¡¦ set screws may have come loose and basket (tumbler) walked forwards or
backwards.
3. Loose or broken basket (tumbler) tie rod.
4. Broken basket (tumbler) support.

X. Excessive noise and/or vibration ¡¦
1. Dryer is not leveled properly.
2. Impellor (fan) out of balance or broken.
3. Loose basket (tumbler) tie rod.
4. Basket (tumbler) is out of adjustment, or adjustment bolts (hardware) are loose.
5. Loose motor or motor mount assembly.

Y. Basket (tumblers) turns too fast (as opposed to other baskets [tumblers]) ¡¦
1. Foreign object(s) caught between basket (belt) and motor shaft.

[Please feel free to Email Metro Laundry tech anytime when you have question.]