ADC 450428 No Display Condition, Drive motor reverses but does not forward, blower motor runs

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1.No Display Condition

a.Check position of “EMERGENCY STOP” (E-Stop) to verify it is in operating position (pull or twist for operating position).

b.Check fuse one (1) or two (2) and if either are blown, replace.

c.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 no voltage is present check primary voltage to transformer.

d.Check voltage across fuses 1 and 2 to ground. If voltage is present, check “EMERGENCY STOP” (E- Stop) “red” and “black” wire to ground. If voltage is present, check voltage across 95 and 96 to ground of the drive motor overload. If voltage is present, check 95 and 96 to ground of the blower motor overload. If voltage is present and transformer terminations are good, then the transformer is faulty. Refer to the schematic supplied with the dryer to assist in the troubleshooting of the dryer.

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 25 AC 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 faulty 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 (A.S.) board.

If there is no voltage across the two (2) AS2 terminals on the arc suppressor (A.S.) board, the problem is a faulty 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.

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Contents ML-130 American Dryer CorporationRetain This Manual In a Safe Place For Future Reference For Your Safety Page Table of Content Phase 6 OPL System Diagnostics Safety Precautions Important InformationStandards Routine Maintenance CleaningMATERIALS, GASOLINE, and Their Flammable Vapors Adjustments LubricationInstallation Requirements ENCLOSURE, AIR SUPPLY, and Exhaust RequirementsElectrical and GAS Requirements Operational Service Check Procedure Page Drive Motor Description of PartsControl BOX HSI HOT Surface Ignition Module Gas Models OnlyGAS Burner Assembly Idler AssemblyBlower Motor and Impellor Main Door Switch Tumbler Basket Bearing and Pulley ArrangementTumbler Basket Sail Switch Gas and Electric Models Only Manual Reset ThermostatHI-LIMIT Gas and Electric Models Only Lint Drawer Switch Lint DrawerSteam Damper System Computer Controls ServicingIntroduction To Replace Computer Control PanelTo Replace Keyboard Touchpad Label Assembly To Replace Microprocessor Temperature Sensor ProbeTo Replace Computer Ignition Controls To Remove Hot Surface Ignitor refer to illustration aboveTo Remove Flame Sensor Probe HSI Ignitor Flame Sensor ProbeTo Test and Adjust Gas Water Column Pressure To Replace Main Burner OrificesTo Convert from Natural Gas to L.P. Gas To Replace Burner Tubes To Replace HSI Hot Surface Ignition ModuleThermostats Page To Adjust Sail Switch Sail Switch Assembly Gas and Electric Models OnlyTo Replace Sail Switch Personal Injury or Fire could ResultTo Replace Main Door Assembly To Install New Main Door GlassTo Replace Front Panel To Replace Main Door Hinge BlockPulleys To Replace Tumbler Basket PulleyTo Replace Small Idler Pulley To Replace Large Idler Pulley To Replace Motor PulleyTumbler Basket Assembly Tumbler Basket Alignment Vertical Up and Down AdjustmentTumbler Basket Alignment Lateral Side to Side Adjustment To Replace Tumbler Basket or Tumbler Basket SupportTo Replace Front Tumbler Basket Support Pillow Block Bearing To Replace Front Idler Shaft Pillow Block Bearing To Replace Rear Idler Shaft Pillow Block BearingBelts Belt Tension Adjustment Tumbler Basket to IdlerBelt Tension Adjustment Motor to Idler To Replace V-BeltsMotors To Replace Drive MotorTo Replace Impellor Motor Fan Shaft Drive Lint Drawer Assembly To Replace Lint Screen To Replace Lint Drawer SwitchImpellor Troubleshooting No display on computerComputer will not accept keyboard touchpad entries Dryer will not start, but computer display indicators are on Dryer operates but is taking too long to dryBurner hi-limit safety thermostat is tripping Thermal overload for drive motor is trippingOverload for impellor fan motor is tripping There is excessive vibration coming from the tumbler basket Phase 6 OPL System Diagnostics Diagnostic L.E.D. light emitting diode Display Failure CodesPage E.D. light emitting diode Display Indicators E.D. Display Indicator NumberE.D. Display Indicator Number FAN Blower Output L.E.D. Indicator AIR AIR JET Output L.E.D. Indicator OptionalHT1 Heat Output L.E.D. Indicator Fuse Main Fuse Input L.E.D. Indicator Lint Lint Door Input L.E.D. IndicatorMain Main Door Input L.E.D. Indicator Flame bURNER Control Fail Input L.E.D. Indicator Power Supply Input L.E.D. IndicatorE.D. Codes 1. Display Codes ALL REVGAS Models only Power 24 VAC is not Evident AT GAS Valve GAS/ELECTRIC only BURNER/OVEN Open HI-LIMIT CircuitGAS only Ignition Attempt Failure Computer Logic and Wiring Diagram Page 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 Microprocessor ComputerManual Reset HI-LIMIT Instructions For Phase 6 ModelsTechnical Information Motor Plate High and LOW VoltageData Label Information on the Data LabelHOW to USE a Manometer Tool List ADC450428 1- 02/22/00-25
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