How to Diagnose and Test the Start Switch of a Whirlpool Dryer

Dealing with a malfunctioning Whirlpool dryer can be frustrating, but understanding how to diagnose and test the start switch can save you time and potentially repair the issue yourself. This guide will walk you through the process of locating the start switch and performing the necessary checks to determine if it's the source of your problem.

Locating the Start Switch and Wiring Diagram

Before you begin any electrical testing, it's important to have the necessary tools and safety precautions in place. In most cases, the wiring diagram for your dryer can be found either stuck to the rear cover or in a bag within the console. If this information is not available, you can look it up online using the model and serial number of your Whirlpool dryer.

Once you have located the wiring diagram:

Refer to the diagram to identify the connections to the start switch. Use your multimeter to check for continuity and voltage.

Remember, working on electrical components can be dangerous. Ensure that the power to your dryer is turned off and disconnected from the main electrical supply to avoid any potential hazards during testing.

Performing Electrical Testing

To test the start switch, you will need an ohmmeter (multimeter) set to the continuity setting. This will allow you to check for continuity between the contacts of the switch:

Step 1: Prepare Your Tools and Environment - Gather all necessary tools, including a multimeter, the wiring diagram, and any other items you may need. Ensure your workspace is clear and free from clutter. Step 2: Locate the Start Switch - Use the wiring diagram to locate the start switch and identify the associated wires on your dryer. Step 3: Check the Switch in Off Position - Set your multimeter to the continuity setting and ensure the switch is in the “off” position. Touch the probes to the appropriate contacts on the switch. If you have continuity, it means the switch is closed when it should be open. Step 4: Test the Switch in On Position - Switch to the “on” position and repeat the continuity test. If there is no continuity, it indicates that the switch is functioning correctly. Step 5: Trace and Check Voltage - Use the wiring diagram to trace and check the voltage at various points to ensure it's consistent with the operating parameters of your dryer.

Be aware that you will be exposed to high voltage during the test. Exercise caution and be prepared for the dryer to come on during the testing. This is a common occurrence and is nothing to be alarmed about.

Further Troubleshooting Tips

If you have confirmed that the start switch itself is not the issue, further testing may be necessary. Some additional steps to consider:

Inspect Connections - Check the wiring connections to the start switch for any signs of damage or wear. Ensure that all connections are secure and not loose. Clear Connections - Clean any dust or debris from the connections to improve conductivity. Re-test Continuity - Perform the continuity test again, ensuring that the switch is in both the “on” and “off” positions.

If all checks are passed and the issue persists, it may be time to consult a professional repair technician. Faulty wiring or an internal problem may require advanced diagnostics that are best handled by a certified expert.

Conclusion

By following these steps, you can effectively diagnose and test the start switch of your Whirlpool dryer. This method not only helps you identify the root cause of the problem but also ensures that you maintain safety while performing repairs. If you're unsure at any point or uncomfortable working with electrical components, it's always best to seek professional assistance.