To troubleshoot, first unplug the dryer and turn off the power switch. It is best to obtain a copy of the dryer service manual to assist you in further troubleshooting the dryer won’t start problem.
You will need a multimeter to check the integrity of some parts. The following parts list is provided as a guide to check which parts should be checked first and in the order listed.
What parts of the dryer can cause it NOT to START?
– Dryer Door Switch
– Dryer thermal fuse
– Press to turn on dryer switch
– Power cord/plug
– Dryer timer mechanism
– Control board
– Dryer drive motor
– Dryer drive belt
– Motor relay switch / belt switch
Dryer Troubleshooting Tips
1. First, disconnect the part from the wiring harness. Isolate the part to properly check it.
2. The thermostat, fuse, or element should show 0 ohms resistance when checked for continuity.
3 If you have a sound meter, it will make a sound. This indicates that the part is functioning properly.
4. If the part is faulty or burned out, the meter reading will not change, this means the part is faulty and needs to be replaced and replaced.
Dryer door switch
The dryer cannot start if the door switch is defective. The door switch detects that the door is open or closed. The dryer may start and then stop abruptly if the door switch is defective. Check the switch with a multimeter and replace it if necessary. Use a multimeter/ohmmeter to check the integrity of the door switch.
Dryer Thermal Fuse
The thermal fuse in your dryer detects the temperature of the hot air coming out of the dryer. The fuse shuts off when the air temperature becomes too high. The thermal fuse is located on the fan cover. Set the multimeter on the R x 1 scale. Check for continuity by touching the wires to the fuse terminals. If the fuse is blown, the meter will show an infinite or zero reading.
Press the TO Dryer switch
If the dryer is mechanically controlled (on dryers without a digital control panel), this switch terminates the voltage to the dryer drive motor. If this switch does not close the circuit to the motor to operate the dryer, it needs be removed and replaced. Use an ohmmeter and check to see if this switch is pass-through. Set the multimeter/ohmmeter to measure resistance on an R x 1 scale. If the switch on the dryer is two wire, place one probe on each of the switch terminals. When the multimeter probes touch the switch terminals, press and hold the switch. If the switch is operating correctly, the multimeter reading should change to zero. If the results do not match, replace the switch.
The dryer power cord plugs into the terminal on the back of the dryer. Check the power cord for signs of failure. Check for loose wires or a possible short that could melt the wire insulation. Check the wiring leading to the plugs. Make sure the wires are securely fastened and not damaged. If you find a damaged, melted or ignited power cord or plug, replace it.
Dryer timer mechanism
The timer has internal contacts that control the dryer drive motor and heater, as well as other components. The dryer timer is defective when the contacts stop working properly. If the dryer timer is faulty, the dryer will not start or advance. If a malfunction is detected, remove and replace the timer.
Electronic Control Board
This main electronic control board (on newer dryer models) controls all dryer functions. To determine if the control board is defective, check for burn marks or melted areas on the board. Replace the control board only after all other parts have been checked for proper operation. This control board is the most expensive part of the dryer. Only disassemble and replace the control board if you find burned or melted areas and consider it defective.
This motor operates the dryer. It turns the main motor shaft, pulley, and drive belt of the dryer. The dryer drive motor may overheat and temporarily shut down. This can lead to the assumption that the motor is faulty. To determine if the motor is malfunctioning and if it is a simple overheating problem, check the positive state of the motor. Dryer motor overheating could be a sign that some component is jammed, the belt is too tight, or that the motor is malfunctioning. Check the wiring harness to the motor and make sure it is secure. Replace the dryer drive motor if it does not work after applying the correct voltage.
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