Microwave ovens provide us with a lot of convenience in modern life, but after a certain number of years of use, some problems will occur more or less. Many of them are related to the failure of the microwave door switch, which may be closed and unable to start, the switch is not sensitive, etc. So what is the reason for the failure of the microwave door switch, and how to solve it?
Where Is The Microwave Door Switch?
Before discussing the reasons why a microwave door switch fails, we first need to understand its location. Usually, the microwave door switch is located below the right control panel of the microwave oven, hidden near the door lock mechanism, and its location can be seen by opening the control panel. When the user opens or closes the microwave door, the door switch detects the state of the door and controls whether the microwave oven is powered on or not. Microwave ovens are usually equipped with multiple micro switches to ensure that the device operates in the correct state.
Reasons For Failure Of Microwave Oven Door Switch
In fact, the failure of microwave oven door switch is caused by many aspects. You can check whether it is caused by the following reasons, because these are common factors that cause switch failure.
Mechanical Wear
The microwave oven door switch is a high-frequency use component. Each time the door is opened and closed, it will cause slight wear of the mechanical parts. After long-term use, the internal contacts may be damaged due to frequent pressing, causing the switch to fail to work properly.
Inspection Method:
- Remove the microwave oven casing and find the location of the door switch.
- Observe whether the appearance of the switch has obvious wear or deformation.
- Use a multimeter to test whether the contacts of the switch can be turned on and off normally.
If the contacts do not respond or respond slowly when the button is pressed, it may be a problem caused by mechanical wear.
Arc Erosion
When the microwave door switch connects or disconnects the circuit, arcs may occur between the contacts, causing the contacts to erode or oxidize. This usually happens on switches of poor quality or that have been used for a long time, affecting their conductivity.
Inspection Method:
- Remove the switch and open the casing to check whether there are traces of burnt black, oxidation or unevenness on the contact surface.
- Use a multimeter to measure the resistance value of the contact. If the resistance value is abnormally high (close to infinity), it means that the contact may fail due to erosion.
Door Switch Stuck Or Spring Failure
The spring structure inside the micro switch is responsible for providing rebound force, but if the spring is damaged due to fatigue or the internal structure is deformed, the switch may not be reset, causing the microwave oven to fail to start or continue to run.
Inspection Method:
- Press the switch button to observe whether the button can rebound normally. If the button is stuck or rebounds slowly, it may be a spring failure.
- Disassemble the switch and check whether the spring is broken, deformed or loose.
- Test whether the mechanical action of the switch is smooth. If the action is jerky or stuck, it may be an internal structure problem.
Improper Installation Or External Impact
When replacing or repairing the microwave oven door switch, if it is not installed properly or is impacted by external force, it may cause the switch to be misplaced or damaged, affecting normal operation.
Inspection Method:
- Check whether the switch is installed in the correct position and aligned with the door linkage.
- Observe whether the switch fixing screws are loose or fall off.
- Check whether the switch housing has cracks or deformation, which may be damage caused by external impact.
- Test whether the switch linkage can trigger the switch action normally.
How To Repair The Microwave Door Switch?
For the above reasons for failure, we can take corresponding solutions to repair the microwave door switch.
Replace The Damaged Door Switch
If the contacts of the door switch are severely worn or cannot be reset, it is recommended to replace with a new high-quality micro switch, such as the Unionwell G5 microwave door switch, which can be used normally for 7 ~8 years.
Clean The Contacts And Check The Circuit
For the case of contact oxidation due to arc ablation, you can use contact cleaner or fine sandpaper to gently polish the contact surface to restore its conductivity. If it is difficult to clean, it is recommended to replace it with a new micro switch.
Adjust The Installation Position Of The Door Switch
If the door switch is improperly installed or loose, you can readjust its position, add screws to fix the position, and ensure that all parts are firmly fixed to avoid the microwave oven being unable to detect the state of the door due to misalignment.
Check The Spring And Replace It
If the spring is found to be failed, you can try to replace a new micro switch or spring, but it is still recommended to replace the new micro switch directly to avoid disassembling the switch and failing to install it.
How To Maintain The Microwave Door Micro Switch On a Daily Basis?
In order to extend the service life of the microwave door switch, we can take the following maintenance measures:
Avoid Opening And Closing The Microwave Door With Excessive Force
When using the microwave oven, the door should be opened and closed as gently as possible to reduce the impact on the door lock mechanism and micro switch.
Check The Switch Status Regularly
You can check the working status of the microwave door switch every few months to ensure that it can open and close the circuit normally, and remove dust or dirt in time.
Use High-Quality Switches
Choose a micro switch with high durability, such as Unionwell’s waterproof sealed micro switch, to reduce the need for frequent replacement.
Buy a More Durable Microwave Door Switch
If you are a microwave oven merchant, it is crucial to choose a high-quality microwave door switch. Unionwell G5 basic micro switch is a durable product designed for microwave oven applications, with the following advantages:
- Long life design: high-quality contact material is used to support hundreds of thousands of press life.
- Stable electrical performance: low contact resistance ensures stable operation of the microwave oven.
- Precise action force control:ensure that the switch is triggered under appropriate pressure to avoid false operation.
- Comply with international standards:passed UL, ENEC and other certifications to ensure safety and reliability.
If you want to purchase a higher quality microwave door switch, you can visit Unionwell micro switch manufacturer for more product information.
Conclusion
In fact, many household appliances are broken because of some parts damage. They can be used normally after simple repair without spending a lot of money to buy a new one. This also gives microwave oven manufacturers a reminder to choose high-quality micro switches to increase the service life in order to gain more trust from consumers. For example, Unionwell’s G5 series microwave door switch is a trustworthy choice. If you are looking for a higher quality micro switch, you may consider Unionwell’s products. We have flexible delivery time and can provide you with free samples for testing.