American Dryer Corp AD-170 service manual No Display Condition

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1.No Display Condition

A.Check main fuses or circuit breaker

B.Check blower motor overload...If tripped, reset

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

D.Across terminal block nos. 6 and 8 you should be getting your 208 V or 240 V.

If no voltage is present at 6 and 8, double check steps A and B and also check wires and terminations at these points.

E.Take voltage reading across the microprocessor 15 pin connector nos. 7 and 13. If there is voltage, replace the computer.

If there is no voltage, there is a bad wire(s) or termination(s) between terminal block nos. 6 and 8 and microprocessor 15 pin connector nos. 7 and 13.

NOTE: In this next section ALL voltage checks must be done in the operating mode with the appropriate microprocessor dot on!! Also appropriate LED output light on!!

NOTE: In this next section when checking for voltage you are looking for 24 AC volts unless otherwise specified.

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

A.If computer dot (First one on left) does not come on, replace computer.

B.Check for voltage across the coil of the reversing contactor located in the rear panel box. The contactor according to your diagram is marked CR2, also, the markings on the coil are A1 and A2.

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

If there is no voltage, check for voltage across the two BS2 terminals on the arc suppressor board.

If there is voltage across the two BS2 terminals and no voltage across the coil of the reversing contactor (A1 and A2), the problem is bad wire(s) or termination(s) between BS2 and the connector coil.

C.If there is no voltage between BS2 terminals on the arc suppressor board, check for voltage across the two AS2 terminals on the board.

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

If there is no voltage across the two AS2 terminals, the problem is bad wire(s) or termination(s) between the arc suppressor board and the computer 15 pin connector no. 3 or a faulty computer.

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Contents AD-170 AD-170 Retain This Manual In a Safe Place For Future ReferencePage For Your Safety Table of Contents Sail Switch Assembly Important Information Safety PrecautionsCleaning Routine MaintenanceLubrication AdjustmentsEnclosure, Air Supply, and Exhaust Requirements Installation RequirementsElectrical and Gas Requirements Operational Service Check ProcedureDSI Module Gas Models Only Computer Panel AssemblyDescription of Parts Control BoxBlower Motor and Impellor 50Hz, 60Hz Steam & 50Hz Gas Gas Burner AssemblyDrive Motor Blower Motor and Impellor Hz Gas Models OnlyTumbler Bearing and Pulley Arrangement Idler AssemblyBasket Tumbler Sail Switch Gas Models only Main Door SwitchHi-Limit Gas Models Only Steam Damper System Automatic Reset ThermostatLint Drawer Switch Lint DrawerIntroduction ServicingComputer Controls To Replace Computer To Replace Keyboard Label AssemblyTo Replace Microprocessor Temperature Sensor Probe Page To Replace Main Burner Orifices To Replace Gas Valve see burner illustration onTo Test and Adjust Gas Water Column Pressure To Convert from Natural Gas to L.P. Gas To Replace Burner Tubes To Replace DSI Module Sail Switch Assembly Gas Models Only To Adjust Sail Switch To Replace Sail SwitchTo Install New Main Door Glass To Replace Main Door AssemblyTo Replace Main Door Hinge Pad To Replace Front PanelTo Replace Small Idler Pulley Pulleys To Replace Tumbler PulleyTo Replace Motor Pulley To Replace Large Idler PulleyPage To Replace Tumbler Basket or Tumbler Basket Support 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 Basket Support Pillow Block BearingTo Replace Rear Idler Shaft Pillow Block Bearing Belt Tension Adjustment Basket to IdlerBelts See illustrations in section F Pulleys To Replace V-Belts Belt Tension Adjustment Motor to IdlerMotors To Replace Drive Motor Page To Replace Lint Drawer Switch Lint Drawer Assembly To Replace Lint ScreenImpellor No display on computer TroubleshootingComputer will not accept key pad entries Drive motor runs, burner is on, but basket will not turn Dryer will not start, but computer display indicators are onDryer operates but is taking too long to dry Dryer operates, probe sparks, but gas does not flowThermal overload for drive motor is tripping Dryer is cycling on burner hi-limit safety thermostatOverload for impellor fan motor is tripping Dryer does not start. Display reads door Display reads dSFL. Dryer Sensor Circuit FailureThere is excessive vibration coming from the basket Electrical Trouble Shooting Diagnostic LED Display Failure Codes Phase 5 OPL System DiagnosticsLED Display Indicators Page Page Cycle Status LED Display/CodesCY F LED Display CodesFill Computer Logic and Wiring Diagram Fault CodesPage No Display Condition Page Blower motor does not operate, drive motor runs Door condition Microprocessor reads Dsfl Motor Plate High and Low Voltage Technical InformationInformation on the Data Label Data Label Contacting American Dryer Corporation ADCHOW to USE a Manometer Using a ManometerAD-170SE Tool List ADC450400 1- 02/27/98-50