How to Change the Diode in a Dryer

Jul 25, 2023, 11:21am

The tumble dryer is a complementary household appliance to the washing machine, which works on an internal heating system. The air is sucked in from the outside by a turbine, it is then heated by the resistors of the dryer. The moist air turns into water which is finally stored in a collection tank. For the proper functioning of the device, it is important to ensure that all its parts are always in good condition.

This electrical device is made up of several electronic components, such as diodes, resistors and others. The diodes are small signaling lamps which accompany the control of the programs. For some brands, they flash when the program can be started and light up after the program has started. It is found on the vast majority of devices.

However, it happens that the device encounters a small failure or a malfunction at this level, over time. The diode can burn out from a short, overvoltage, or wear out in some other way. A diode should be replaced if you notice that:

  • the diode does not react to any program,
  • it is off before and throughout the cycle.

It is a simple operation that you can do by yourself.

For most models, the diode is located on the control panel on the front of the device. To access it, you must remove the upper panel and the control panel.

The diode in a dryer is a crucial component of the dryer’s heating circuit. It is responsible for allowing current to flow in only one direction, which ensures that the heating element receives the correct voltage to produce heat during the drying cycle. If the diode becomes faulty, the dryer may not heat up properly or may not heat at all. Changing the diode is a relatively simple process, but it requires some basic tools and knowledge of electrical components. In this step-by-step guide, we will walk you through the process of changing the diode in a dryer.

How to Change the Diode in a Dryer

Step 1: Safety Precautions

Before you begin any repair work on your dryer, prioritize safety. Ensure the dryer is disconnected from the power supply by unplugging it from the electrical outlet or switching off the circuit breaker dedicated to the dryer.

Step 2: Access the Dryer’s Heating Element

To access the diode, you will need to open the dryer’s cabinet and locate the heating element. The specific steps to access the heating element may vary depending on your dryer model. Generally, you will need to:

  1. Remove any screws or clips securing the dryer’s top panel to the cabinet. Slide a putty knife or a similar tool between the top and front panels to release any hidden clips.
  2. Lift the top panel and prop it up securely.
  3. Locate and remove the screws or clips securing the front panel to the sides of the cabinet.
  4. Carefully tilt the front panel forward and disconnect any wires or cables attached to the door switch.
  5. Set the front panel aside.
  6. Now, you will have access to the dryer’s heating element.

Step 3: Locate the Diode

With the heating element exposed, locate the diode. It is a small electronic component usually connected to the heating element through wires.

Step 4: Disconnect Wiring

Before removing the diode, carefully disconnect the wires connected to it. Take note of the location and arrangement of the wires to ensure you can reconnect them correctly later.

Step 5: Remove the Old Diode

Gently remove the old diode from its position. It may be secured with a bracket, clip, or adhesive. If it is held in place with a bracket or clip, use a screwdriver or pliers to loosen and remove the bracket or clip.

Step 6: Install the New Diode

Position the new diode in place, aligning it with the corresponding holes or slots on the bracket. If the diode requires adhesive to secure it in place, apply the adhesive according to the manufacturer’s instructions.

Step 7: Reconnect Wiring

Carefully reconnect the wires to the new diode. Make sure each wire is attached to the correct terminal based on the notes you took during disconnection.

Step 8: Reassemble the Dryer

With the new diode installed and the wiring reconnected, it’s time to reassemble the dryer. Reverse the steps you followed to access the heating element and secure the front panel back onto the dryer’s cabinet.

How to Change the Diode in a Dryer

Step 9: Test the Dryer

Before pushing the dryer back into its designated spot, perform a test run to check if the new diode is functioning correctly. Turn on the dryer and run a drying cycle to ensure that the heating element is receiving the correct voltage and producing heat.

Step 10: Final Adjustments

If you encounter any issues with the new diode during the test run, double-check the installation and wiring connections. Make any necessary adjustments to ensure proper functionality of the diode and the heating element.


Changing the diode in a dryer is a straightforward task that can resolve heating issues and improve the performance of your appliance. By following this step-by-step guide, you can successfully replace the old diode with a new one, allowing the heating element to receive the correct voltage and produce heat during the drying cycle. Properly functioning diode ensures efficient and effective drying, ensuring your clothes come out dry and fresh. However, if you encounter any difficulties during the process or have concerns about handling the repair, it’s always best to seek assistance from a professional dryer technician. With the new diode in place, you can enjoy reliable and consistent heating from your dryer.