My Electrical Appliance Timber Dryers does not Start in Cycle, how to fix it (check point)

An obvious failure symptom is when you select a drying cycle and attempt to start the dryer, but it does not run. To find the cause of the problem, move the dryer out from its position and unplug the power cord.

If line voltage is indicated on the volt/- ohmmeter, check the dryer power cord as possible cause of the problem.

Using Test Equipment

To avoid any incorrect readings when using the volt/ohmmeter, always “zero” the ohmmeter before making continuity checks on components.

Before making continuity checks with the volt/ohmmeter, always unplug the dryer power cord. Live voltage checks will damage the meter movement.

Check For Burned Or Broken Wires

Next check inside the dryer cabinet for burned, corroded, loose, or broken wires to major components such as the wiring harness, timer assembly, switches, and drive motor assembly. A failure in the above components will cause the dryer to have erratic operation or the dryer will not start in the cycle.

Check Dryer Door Switch

A faulty dryer door switch can prevent the dryer from starting. Start by making a visual inspection of the switch. You should hear a click as the striker is depressed against the switch, which would indicate that the striker and switch are good.

If you do hear a click you can assume that the door switch is mechanically OK. However, you still must check the door switch using a volt/- ohmmeter to test for continuity. First, unplug the dryer power cord and remove switch. Remove screws that secure switch to cabinet. Set the volt/ohmmeter on the RX-1 scale. Place a probe of the volt/ohmmeter on each terminal of the door switch. With the switch depressed the volt/ohmmeter should indicate continuity, or 0 ohms. No continuity means the switch is bad and will have to be replaced.

If a volt/ohmmeter is not available, you can bypass the switch (with power cord unplugged) by inserting a paper clip, wire, solder, or other round metal object between the two terminals of the switch. If the dryer starts when plugged in, this would indicate that the dryer door switch is faulty.

Proper operation of the door switch can also be determined by a voltage check using a volt/- ohmmeter. If line voltage is available to the door switch terminals, the volt/ohmmeter will show a reading of 110-125 volts.

To check the door switch of a gas dryer, use the same procedures as discussed above for the electric dryer.

Check Drive Motor

The drive motor must be suspected when the dryer will not start in the operate cycle. An easy check, which involves no test equipment, is to listen for a low-pitched hum when the dryer timer is turned ON or the push-to-start switch is pushed to the ON position. If there is a low- pitched hum when the dryer tries to start, there is a good possibility the drive motor starting switch or motor windings are defective. To restore the dryer to proper operating order, you will have to replace the drive motor or motor centrifugal switch.

Check Drive Motor Centrifugal Switch

An easy check that can be made is to test the condition of the switch with a volt/ohmmeter. Set the meter on the RX-1 scale and place one probe on terminal 6 (black wire). The other probe is attached to either the yellow or blue terminal. With the switch depressed, there should be continuity (full-meter swing). If continuity is not indicated, replace the switch.

Check Drive Motor Windings

The volt/ohmmeter can be used to check the condition of the drive motor windings. Set the scale of the volt/ohmmeter to the RX-1 scale and place one of the probes of the volt/ohmmeter on the BK or black wire from the motor. Place the other probe on the white wire. A continuity reading of near 0 ohms should be indicated on meter. A second winding can be checked by moving the probe of the volt/ohmmeter from the white to the blue wire on the drive motor. Again, continuity should be indicated. An open winding will give a high resistance reading or no reading on the volt/ohmmeter. It can then be assumed that the drive motor is faulty and you will have to replace it to return the dryer to proper operation.

Check Drive Motor Bearings

If you hear a humming sound and the drive motor does not start, it could safely be assumed that line voltage is available to start the drive motor. The next step is a mechanical check to see if the drive motor shaft is frozen. With the dryer front panel and idler pulley removed, turn the motor shaft in a clockwise or counterclockwise rotation. The motor shaft should turn freely. If there is binding or the shaft is frozen or hard to turn, the drive motor would have to be replaced.

Check Idler Pulley

With the idler pulley removed, turn the pulley to see if the roller turns freely. If not, replace it.

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