Home Appliance Timber Dryer does not Heat, how to fix? part 1

Specific failure symptoms include: 1) Clothes are not dry at end of cycle. 2) The dryer timer assembly is not advancing in the cycle properly.

To find the cause of the problem, first move the dryer out from the wall and remove the vent hose. With the dryer running, place your hand on the dryer exhaust duct to determine if there is any hot air being discharged. If the air is cold, you will have to make a line voltage check at the dryer receptacle to determine whether full 220-to-240-volt power is available.

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 Receptacle

To determine if electrical power is available at the dryer receptacle, first unplug the dryer power cord. Set the volt/ohmmeter on the 250 - to 500-volt scale. Place one probe in one slot of the receptacle, and place the other probe in the remaining slot of the receptacle. If correct line voltage is available, a reading of 220-240 volts will be indicated.

The gas dryer does not operate on 220-240 volts of electricity. For gas dryers, perform the same check as above except set the volt/-ohmmeter on the 150-volt scale. If line voltage is available at the receptacle you will show a reading of 110-125 volts.

If no line voltage is indicated at the dryer receptacle, check the plug itself, house wiring, or the dryer circuit breaker as a cause of the problem. If you determine the dryer receptacle, electrical wiring, or circuit breaker to be faulty, call a licensed electrician to fix the problem.

Check Dryer Cord

If you did get line voltage but the machine still doesn’t work, check the dryer power cord. First, unplug the dryer from the wall receptacle. Set the volt/ohmmeter on the RX-1 scale. Place one probe of the volt/ohmmeter on one prong of the dryer cord, and place the other probe of the volt/ohmmeter on the other end of the power cord. If one side of the cord has no burned or broken wires within the cord, the volt/ohmmeter should show a continuity reading of 0 ohms resistance, or full-meter swing. Perform the same procedure as just described on the other side of the dryer cord and, again, the volt/ohmmeter should show a continuity reading of 0 ohms resistance. If you read continuity on both prongs of the dryer cord, the cord is not defective. No reading on the volt/ohmmeter means the cord is defective and must be replaced.

The power cord on a gas dryer can be checked using the same procedure as discussed above.

Check Timer Assembly

Check the dryer timer assembly as a possible cause of no heat. To check the dryer timer, unplug the dryer power cord and set the volt/ohmmeter on the RX-1 scale. Place one probe of the volt/ohmmeter on the heat terminal of the dryer timer, and place the other probe to another terminal of the timer. As you turn the timer knob, the volt/ohmmeter should indicate continuity (which would mean the dryer contact points are closing). If the volt/ohmmeter does not indicate continuity or meter swing as you turn the timer knob, the contacts that supply voltage to electrical components within the dryer are faulty. You will have to replace the dryer timer to restore the dryer to proper operating order.

NOTE: To locate the contacts that supply voltage to electrical components such as the heating element, you might have to refer to the wiring diagram of the dryer being serviced.

To check the timer assembly of a gas dryer, use the same procedures that were used to check the electric dryer timer.

Check Selector Switch

Next, check the dryer selector switch as a possible cause of the dryer not heating. Set the volt/ohmmeter to the RX-1 scale. Place one probe on one switch terminal, and place the other probe on another terminal of the switch. With the selector switch knob turned to the heat selection corresponding to the terminals chosen, the volt/- ohmmeter should indicate continuity or full-scale deflection. Repeat this terminal sequence for each setting on the selector switch. If you show no continuity at any switch setting, you will have to replace the selector switch to restore the dryer to proper operating order.

To check the selector switch on a gas dryer, use the same procedures that were used to check the electric dryer as described above.

Check Heating Element (Electric Dryer)

When there is no heat, an obvious cause is the dryer heating element. To check the element, move the dryer out from the wall and remove the back panel of the dryer. Locate the element and set the volt/ohmmeter on the RX-1 scale. Disconnect one lead from element and then place one probe of the volt/ohmmeter on one terminal of the element. Place the other probe of the volt/ohmmeter on the remaining terminal of the element. A continuity reading of the volt/ohmmeter of approximately 2-5 ohms is normal.

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