Microwave button not working

If you encounter non-functioning buttons on your microwave, it’s typically caused by issues within the control panel, membrane switch, or main control board. While these problems can be repaired, it may be more practical to replace your old microwave with a new one, considering the intricacy and expense involved in fixing these components.

However, if you’re determined to proceed with the repair, you can follow our detailed instructions outlined below. These instructions are designed to be applicable to most electronic button-equipped microwaves, regardless of the make or model.

Read Also: Auto Defrost Fridge Problems

Replace the Control Panel

The initial step to address the issue is to replace the control panel. A clear indication of a faulty control panel is when certain buttons function correctly while others do not. Since it’s not possible to replace individual buttons, the most practical solution is to replace the entire control panel.

It’s essential to emphasise that working on microwaves can be extremely hazardous due to the risk of electric shocks. Do not attempt to open and manipulate internal components unless you possess the necessary experience and qualifications to do so.

Follow these steps to replace the control panel in your microwave:

1. Disconnect your microwave from the power source by unplugging it.
2. Remove the cabinet covering the appliance. This will grant you access to the control panel. If necessary, also remove the front grill. Both sections can be detached by unscrewing the holding screws and then carefully unclipping them.
3. Ensure that the capacitor is fully discharged. You can achieve this by either leaving your microwave unplugged for 48 hours before testing the control panel or by discharging it instantly through shorting. If you lack prior experience with microwave repair, it is advisable not to proceed further. Instead, seek the assistance of a qualified technician to inspect your microwave.
4. Detach the front control panel by unfastening the securing screws and disconnecting the wires attached to it. Be sure to unscrew the ground connection as well.
5. Locate the touchpad membrane on the control panel and carefully peel it off.
6. Install a new membrane in the same position as the old one.
7. Place the new control board in position and secure it using the screws that were previously removed.
8. Reconnect the wires to the control panel.
9. Reattach the microwave cabinet and front grill.
10. Restore power to the microwave.
11. Verify whether the buttons on your microwave now function correctly. If they do not, inspect the membrane switch as the next step.

Pros and Cons of Microwave

Pros

• Efficient Heating
• Energy Efficiency
• Even Heating
• Convenience
• Space-Saving

Cons

• Limited Cooking Techniques
• Quality of Cooking
• Uneven Cooking
• Loss of Nutrients

Differences Between Microwave and Dryer

Microwave

Microwaves work by emitting microwave radiation to excite water molecules in food, generating heat and cooking the food from the inside out.

Dryer

Dryers circulate heated air through a drum containing wet laundry. The warm air evaporates the moisture in the clothes, and the resulting water vapour is expelled outside, leaving the clothes dry.

Alternative to Microwave

Conventional Oven or Toaster Oven

• Conventional ovens and toaster ovens can be used to heat or cook food, just like a microwave. They provide even heating and are suitable for baking, roasting, and broiling.
• Advantages: Can cook a wide range of dishes; better for browning and crisping.
• Limitations: Slower than microwaves, they consume more energy.

Check the Membrane Switch

The following step is to examine and, if necessary, replace the membrane switch. The membrane switch, also known as the touchpad, is responsible for activating controls when specific buttons are pressed. When the switch malfunctions, it can cause one or more buttons to become unresponsive.

As with all other repair procedures in this guide, exercise extreme caution when dealing with internal components, as there is a significant risk of electric shock if not handled properly.

Follow these steps to inspect the membrane switch in your microwave:

1. Disconnect your microwave from the power source by unplugging it.
2. Remove the cabinet covering the appliance to gain access to the membrane switch. If necessary, remove the front grill as well. Both sections can be detached by unscrewing the holding screws and carefully unclipping them.
3. Identify the location of the membrane switch.
4. Disconnect the wires connected to the membrane switch.
5. Use a multimeter to test the membrane switch.
6. If the switch shows continuity, it is functioning correctly. You can then reattach the wires and proceed to replace the main control board. If it does not show continuity, it needs to be replaced.
7. To replace the switch, remove the faulty one from your microwave and replace it with a new one. Replacement switches can typically be found at most major hardware stores.
8. After installing the new switch, reassemble your microwave, power it on, and verify if the buttons are now functioning properly. If they are not, proceed to replace the main control board.

Replace the Main Control Board

The main control board represents the last component you can replace to potentially resolve the issue of non-functioning buttons on your microwave. This crucial component is responsible for sending voltage to the membrane switch, allowing the control board to respond when you press the buttons. While replacing the main control board is a less common solution, it can sometimes rectify the problem of unresponsive buttons.

To assess and, if necessary, replace the main control board in your microwave, follow these steps:

1. Disconnect your microwave from the power source by unplugging it.
2. Remove the cabinet covering the appliance to access the control panel. If needed, remove the front grill as well. Both sections can be detached by unfastening the screws holding them in place and then unclipping them.
3. Identify the main control board’s location.
4. Remove the main control board by unscrewing the screws that secure it in place and disconnecting the wires.
5. Replace the main control board by removing the defective one from your microwave and installing a new one. Replacement control boards are typically available at most major hardware stores.
6. After installing the new control board, reassemble your microwave, power it on, and verify if the buttons are now functioning correctly. If they are not, your next course of action would be to have a technician inspect your appliance or consider purchasing a new one.

Conclusion

The main control board represents the last component you can replace to potentially resolve the issue of non-functioning buttons on your microwave. This crucial component is responsible for sending voltage to the membrane switch, allowing the control board to respond when you press the buttons.

While replacing the main control board is a less common solution, it can sometimes rectify the problem of unresponsive buttons.