American Dryer Corp ML-145, ML-170 service manual Blower motor does not operate, drive motor runs

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

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

2.If set for reverse, replace computer.

3.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.

If there is voltage across the two (2) BS3 terminals and no voltage across the coil of the reversing contactor (A1 and A2), the problem is faulty wire(s) or termination(s) between BS3 and the contactor coil.

4.If there is no voltage between the two (2) BS3 terminals on the arc suppressor (A.S.) board, check for voltage across the two (2) AS3 terminals on the board.

If there is voltage across the two (2) AS3 terminals and no voltage across the two (2) BS3 terminals, replace the arc suppressor (A.S.) board.

If there is no voltage across the two (2) AS1 terminals, the problem is faulty wire(s) or termination(s) between the arc suppressor (A.S.) board and the computer 9 pin connector no. 9, or a faulty computer.

D.Blower motor does not operate, drive motor runs...

1.Check for voltage across terminals A1 and A2 of the impellor contactor. This is the single contactor in the rear control box.

If voltage is present check for voltage across the blower motor. If there is voltage at the blower motor replace the motor.

If there is no voltage at the blower motor, the problem is faulty wire(s) or termination(s) between the contactor and the motor.

2.If there is no voltage present at A1 and A2 of the contactor, check for voltage across the two (2) BS1 terminals of the arc suppressor (A.S.) board.

If there is voltage present at the two (2) BS1 terminals, the problem is faulty wire(s) or termination(s) between the two (2) BS1 terminals and the coil (A1 and A2) terminals.

If there is no voltage across the two (2) BS1 terminals, check for voltage across the two (2) AS1 terminals.

If there is voltage across the two (2) AS1 terminals and there is no voltage between the two (2) BS1 terminals, replace the arc suppressor (A.S.) board.

3.If there is no voltage across the two (2) AS1 terminals, the problem is faulty wire(s) or termination(s) between the two (2) AS1 terminals and the computer board 9 pin connector no. 7, or a faulty computer.

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Contents American Dryer Corporation ML-145 / ML-170Retain This Manual In a Safe Place For Future Reference For Your Safety Page Table of Content Section Technical Information Important Information Safety PrecautionsStandards Cleaning Routine MaintenanceLubrication AdjustmentsElectrical and GAS Requirements Installation RequirementsENCLOSURE, AIR SUPPLY, and Exhaust Requirements Operational Service Check Procedure Gas 10.5 inches water column 26.1 mb Control BOX Description of PartsControl Panel Microprocessor Control Panel NON-MICROPROCESSORDrive Motor GAS Burner AssemblyHSI HOT Surface Ignition Module Gas Models onlyTumbler Basket Bearing and Pulley Arrangement Idler AssemblyBlower Motor and Impellor GAS and Steam Tumbler Basket Main Door SwitchSail Switch Gas Models only Lint Drawer Automatic Reset ThermostatHI-LIMIT Gas Models only Compressed AIR Requirements Lint Drawer SwitchTemperature Sensor Bracket NON-COMPUTER Steam Damper SystemTo Replace Computer ServicingIntroduction Computer ControlsTo Replace Microprocessor Temperature Sensor Probe To Replace Keyboard Touchpad Label AssemblyTo Replace Gas Valve Refer to above burner illustration To Remove Flame Probe AssemblyIgnition Controls To Replace Main Burner Orifices To Test and Adjust Gas Water Column PressureTo Replace Burner Tubes To Convert from Natural Gas to L.P. GasTo Replace Burner Hi-Limit Thermostat Gas Models Only To Replace HSI Hot Surface Ignition ModuleThermostats To Replace Sail Switch Sail Switch Assembly Gas Models onlyTo Replace Main Door Assembly To Adjust Sail SwitchTo Replace Front Panel To Install New Main Door GlassTo Replace Tumbler Basket Pulley To Replace Main Door Hinge BlocksPulleys To Replace Large Idler Pulley To Replace Small Idler PulleyTo Replace Motor Pulley Tumbler Basket AssemblyTumbler Basket Alignment Vertical Up and Down Adjustment To Replace Tumbler Basket or Tumbler Basket Support Tumbler Basket Alignment Lateral Side to Side AdjustmentImportant Never strike the shaft directly with a hammer To Replace Front Idler Shaft Pillow Block Bearing To Replace Front Tumbler Basket Support Pillow Block BearingBelts Refer to illustrations in section F Pulleys Belt Tension Adjustment Tumbler Basket to IdlerTo Replace Rear Idler Shaft Pillow Block Bearing To Replace Drive Motor Belt Tension Adjustment Motor to IdlerTo Replace V-Belts MotorsImpellor To Replace Lint Drawer Switch Lint Drawer Assembly To Replace Lint ScreenComputer will not accept keyboard touchpad entries TroubleshootingDisplay is reading no Airflow Display is reading Rotation Sensor FailDisplay is reading No Heat Display is reading Sail Switch FailDisplay is reading Drum Safety Fail Display is reading Burner Safety FailDisplay is reading Lint Door Display is reading Burner Control FailureDisplay is reading Burner Flame Failure Display is reading Main DoorThermal overload for drive motor is tripping Display is reading HotDryer operates but is taking too long to dry There is excessive vibration coming from the tumbler basket Overload for impellor fan motor is trippingElectrical Troubleshooting Diagnostic L.E.D. light emitting diode Display Failure Codes Phase 6 OPL System DiagnosticsPage E.D. Display Indicator Number E.D. light emitting diode Display IndicatorsE.D. Display Indicator Number HT1 Heat Output L.E.D. Indicator FAN Blower Output L.E.D. light emitting diode IndicatorAIR AIR JET Output L.E.D. Indicator Optional Drum Tumbler Basket HI-LIMIT Input L.E.D. Indicator Fuse Main Fuse Input L.E.D. IndicatorLint Lint Door Input L.E.D. Indicator Main Main Door Input L.E.D. IndicatorPower Supply Input L.E.D. Indicator Flame bURNER Control Fail Input L.E.D. IndicatorE.D. Display Operating Status D. DISPLAY/CODESPhase 6 OPL Microprocessor L.E.D. Displays ALL REV E.D. Codes 1. Display CodesGAS only Ignition Attempt Failure GAS Models only Power 24 VAC is not Evident AT GAS ValveGAS/ELECTRIC only BURNER/OVEN Open HI-LIMIT Circuit Computer Logic and Wiring Diagram No Display Condition Blower motor does not operate, drive motor runs No Heat Drive and Blower Motors Run Steam Models No Heat Drive and Blower Motors Run Gas ModelsDoor Condition Motor Plate High and LOW Voltage Technical InformationInformation on the Data Label Data LabelHow to Use a Manometer Using a ManometerML-170 Tool List ADC 450429 1- 02/18/00-25
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