Electronic Timber Dryers Stops in Cycle

This failure is normally attributed to a loss of electrical power or an electrical overload.

To find the cause of the problem, move the dryer out from the wall and unplug the dryer power cord from dryer wall receptacle. Make a voltage check with the volt/ohmmeter to determine if there is electrical power available to the dryer receptacle or to the dryer power cord.

Using Test Equipment

To avoid incorrect readings when using the volt/ohmmeter, always “zero” the ohmmeter before making continuity checks. See operating instructions that came with your volt/ohmmeter.

When making continuity checks on components, always unplug the dryer power cord from the receptacle because live voltage checks will damage the meter movement.

Check For Drive Motor Overheating

If the dryer works OK for two or three loads before it stops, attempt to restart the dryer after waiting for approximately thirty to forty-five minutes. If the drive motor restarts after cool- down, it is safe to assume that the motor is overheating, causing the dryer to stop in mid-cycle. Probably the drive motor has been damaged permanently, and will have to be replaced.

Before replacing the dryer drive motor, it would be worth the effort to remove the dryer toe- plate, unplug the dryer power cord, locate the drive motor and brush or clean it thoroughly with a vacuum cleaner. Remove all traces of lint, dirt and debris from the drive motor housing. NOTE: You should perform this cleaning at least once a year to prevent the buildup of debris in the drive motor housing. After cleaning the motor housing, turn the dryer timer to the ON position, and recheck the dryer operation. Sometimes, cleaning the drive motor is all that is necessary to fix the intermittent operation.

If this check fails, check inside the dryer cabinet for burned, corroded, loose, or broken wires to the dryer’s major components. Problems in the wiring harness, timer assembly, switches, and drive motor can result in the dryer stopping *in the cycle.

Check Safety Thermostat

There are some late-model dryers that have a protective device type thermostat, which is really no more than a fuse that melts when the dryer reaches high temperatures. As the dryer approaches dangerously high temperatures, the safety thermostat will melt, interrupting power to the drive motor.

You can easily check the safety thermostat or fuse with a volt/ohmmeter. First remove it from the dryer. With the volt/ohmmeter set on the RX-1 scale, place one probe of the volt/ohmmeter on each terminal of the thermostat. If the thermostat is good, look for a reading of 0 ohms, or full-meter swing, on the volt/ohmmeter. No continuity means the safety thermostat is faulty. To restore the dryer to working order, you will have to replace the operating thermostat that caused the dryer to overheat, in addition to the safety thermostat.

REPAIR PROCEDURES

Unplug the dryer power cord or gas supply before servicing the clothes dryer. Exercise care when removing the dryer from its original position as the dryer legs can easily tear or scratch the floor.

To service the clothes dryer, remove the dryer back panel so that you can make a voltage check with the volt/ohmmeter at the dryer terminal block and dryer receptacle.

To Replace Safety Thermostat

To replace the safety thermostat, unplug the dryer power cord. Remove the screws that secure the thermostat to the dryer cabinet and remove the defective thermostat.

Install the replacement safety thermostat by mounting in the same position as the defective part that was removed. Follow instructions and procedures provided with the replacement part or reverse the above steps.

When removing and replacing the safety thermostat of the gas dryer, the repair procedures are the same as was discussed for the electric dryer.

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