Here are some common causes and fixes to this problem.
If your dryer won’t start there’s a number of different things that could be causing the problem. You’ll likely need to do a little troubleshooting to identify the cause. But as simple as it may sound, first check the control settings to ensure that all buttons are fully depressed and that the settings are correct. Also, check that the start button was either pressed or turned enough to activate the dryer.
Power
Check the power supply first to ensure that electricity is reaching your dryer. Use your multimeter to check the voltage at the outlet. If power is not flowing to your dryer, check your home’s electrical panel to see if any breakers may have been tripped.
If the breakers haven’t been tripped, it’s possible that the outlet needs to be replaced. If this is your problem it’s probably a good idea to contact an electrician unless you are comfortable working with electricity.
If the breakers haven’t been tripped, it’s possible that the outlet needs to be replaced. If this is your problem it’s probably a good idea to contact an electrician unless you are comfortable working with electricity.
If your outlet checked out with the multimeter and your dryer is getting electricity, the problem could be the power cord. Dryer power cords are prone to fraying due to movement and age.
Terminal Block
The power will need to be ON for this test, so be extremely careful. If you are uncomfortable working with electricity, this may not be something you will want to undertake and you should call an experienced repairman.
Remove the power cord access panel and use your multimeter to check the voltage at the terminal block.
Replace the terminal block if it is faulty. Unplug the dryer and unscrew the mounting screws to disconnect power wires from the terminal block. Use a flathead screwdriver to remove the terminal block from the casing. Install a new terminal block.
Door Switch
The door switch will keep the dryer from starting if the door is open. Frequently lint or other debris collects around the door gasket or switch. This build-up can prevent the door from completely closing and engaging the switch. If this is your problem, it’s an easy fix and something you can clean regularly to prevent future occurrences.
If you suspect the door switch is faulty, you may need to open the cabinet in order to troubleshoot and replace the switch depending on your model and manufacturer.
Thermostat
There are a number of different thermostats in your dryer with the single job of regulating the internal temperature. Which thermostat being used is determined by which drying cycle is selected.
The cycling thermostat is generally located in the air flow path as it leave the drum. It is frequently inside the venting/exhaust system or on the blower wheel housing. A thermostat is about 1-1/2″ long and is oval shaped. Be sure to label the 2 wires when you remove them so you can reconnect them in the same way.
When the thermostat is at room temperature test with your multimeter set to RX1 and touch the probes to each terminal. If the thermostat is still in working order it will give a reading of zero since we are testing for continuity. If you receive anything other than a zero reading it will need to be replaced.
Start Switch
If the start switch is faulty your dryer obviously won’t start. To troubleshoot this problem remove the knob from the start switch and open the control panel. Set your multimeter to RX1 and remove the leads to the switch. Clip the probes to the terminals of the switch. You should have a reading of infinity.
Next press the start button and check the reading. It should now read zero. The start switch is faulty and will need to be replaced if this was not the case.
Thermal Fuse
Some dryers are designed with a thermal fuse that is within the exhaust duct in the rear panel. Once the thermal fuse is tripped the dryer will not operate (or it may simply stop heating). There is not a way to reset this fuse so it will need to be replaced if it tripped.
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