ADC ML-82 No Display Condition, Drive motor reverses but does not forward, blower motor runs

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1.No Display Condition

a.Check fuse 1 or 2 and if either are blown, replace.

b.Take voltage reading across the microprocessor (J7) 9-pin connector pins 1 and 2. If no voltage is present at pins 1 and 2, double check the secondary (24 VAC) side of transformer at the blower motor contactor number 13 to ground if voltage is present. Problem is bad wire or faulty connection from blower motor contactor #13 back through J2 9-pin connector and then to computer connector pin 1.

c.Check primary voltage to the 24 VAC transformer. (208-240 VAC). If voltage replace the transformer. If no voltage check blower motor. Overload to see if tripped. If tripped reset, if not tripped check incoming to power block -- (L1, L3).

NOTE: In this next section ALL voltage checks must be done in the operating mode with the appropriate microprocessor dot on. Also appropriate L.E.D. (light emitting diode) output light on.

NOTE: In this next section when checking for voltage you are looking for 25AC volts unless otherwise specified.

2.Drive motor reverses but does not forward, blower motor runs

a.If computer dot (first dot on the left) does not come on replace the computer.

b.Check for voltage across the coil of the forward contactor located in the reversing panel box. The contactor according to your diagram is marked CR2. The coil markings A1 and A2.

If voltage is present, replace reversing contactor.

If voltage is not present, there is a bad wire or termination between BS2 and contactor coil (CR2).

c.If there is voltage across the two (2) AS2 terminals and no voltage across the two (2) BS2 terminals, replace the arc suppressor board.

If there is no voltage across the two (2) AS2 terminals on the arc suppressor (A.S.) board, the problem is a bad wire or termination between the AS2 board and the J7 9-pin computer connector no. 8 or faulty computer.

3.Drive motor works in forward mode but does not reverse, blower motor runs

a.If computer dot (second one from left) does not come on, check program to see if set for reverse.

b.If set for reverse, replace computer.

c.Check for voltage across the coil of the reversing contactor located in the rear panel box. The contactor according to your diagram is CR3, also the markings on the coil are A1 and A2.

If there is voltage, replace the coil or the complete contactor.

If there is no voltage, check for voltage across the two (2) BS3 terminals on the arc suppressor (A.S.) board.

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Contents ML-82 Retain This Manual In a Safe Place For Future Reference For Your Safety Page Table of Contents Section SERVICE/PARTS Information Safety Precautions Important InformationStandards SPECIFICATIONS/COMPONENT Identification SpecificationsSpecifications MLG-82 Gas MLS-82 Steam Component Identification Page Routine Maintenance CleaningAdjustments LubricationControl Panel Assembly Door Switch AssemblyLint Drawer Lint Drawer Switch Description of PartsTemperature Sensor Bracket Assembly Basket and Support AssemblyTumbler Bearing Assembly DRIVE/FAN Mount Assembly Idler ARM AssemblyBlower Motor Sail Switch Assembly HSI HOT Surface Ignition Burner BOX AssemblyFront Panel Assembly Reversing Relay Panel Servicing IntroductionTo Replace Keyboard Label Assembly To Replace Microprocessor Temperature Sensor ProbeComputer Controls To Replace Computer BoardIgnition Controls To Remove Hot Surface IgnitorTo Remove Flame Sensor Probe HSI Ignitor Flame Sensor ProbeTo Replace Gas Valve Refer to burner illustration on To Test and Adjust Gas Water Column PressureTo Replace Main Burner Orifices To Convert Natural Gas to L.P. Gas To Replace HSI Module To Replace Burner TubesTo Replace Burner HI-LIMIT Thermostat GAS Models only Sail Switch Assembly GAS Models only To Replace Sail Switch To Adjust Sail SwitchTo Replace Main Door Assembly To Install New Main Door GlassTo Replace Front Panel To Replace Main Door Hinge BlockSteam Controls Installation To Replace Steam Coil Damper SystemTo Replace Piston To Replace The Needle ValveTo Replace the 3-Way Micro Valve To Replace Steam CoilTo Replace Tumbler Pulley Reversing Tumbler and Bearing AssemblyTo Replace The Rear Tumbler Bearing Idler Shaft and Bearing Assembly To Replace The Front Tumbler BearingTo Replace Idler Pulley To Replace Idler BearingTumbler Basket Drive PulleyTumbler Alignment Vertical Tumbler Alignment Lateral To Replace The Tumbler And/Or Tumbler SupportBelt Tension Adjustment-Tumbler To Idler Belts Refer to Illustrations in Sections I and KBelt Tension Alignment Motor To Idler To Replace V-BeltsPhase 6 OPL System Diagnostics Diagnostic L.E.D. Display Failure CodesPage E.D. Light Emitting Diode Display Indicators E.D. Display Indicator NumberPage FAN Blower Output L.E.D. light emitting diode Indicator AIR AIR JET Output L.E.D. Indicator OptionalHT1 Heat Output L.E.D. Indicator Fuse Main Fuse Input L.E.D. IndicatorLint Lint Door Input L.E.D. light emitting diode Indicator Main Main Door Input L.E.D. IndicatorDrum Tumbler HI-LIMIT Input L.E.D. Indicator Sail Sail Switch Input L.E.D. IndicatorPower Supply Input L.E.D. Indicator E.D. Codes Fault Codes GAS Models only Power 24 VAC is not Evident AT GAS ValveGAS/ELECTRIC only BURNER/OVEN Open HI-LIMIT Circuit GAS only Ignition Attempt FailureTroubleshooting Computer will not accept keypad touchpad entriesDryer operates but is taking too long to dry Drive motor runs, burner is on, but basket will not turnThermal overload for drive motor is tripping Burner hi-limit safety thermostat is tripping Overload for impellor fan motor is trippingThere is excessive vibration coming from the basket Electrical Troubleshooting No Display Condition Drive motor reverses but does not forward, blower motor runsBlower motor does not operate, drive motor runs Lint Door ConditionMain Door Condition Temp Sensor Fail CheckMotor Plate High and LOW Voltage Technical InformationFor example Data Label Contact American Dryer CorporationData Label Model Dryer American Gas Association, Canadian Gas AssociationManual Reset HI-LIMIT Instructions Computer Logic Service SERVICE/PARTS InformationParts Returning Warranty Cards Warranty InformationReturning Warranty Parts Page ML-82 Tool List ADC 450404 1- 12/21/99-50
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