Wall switches are electrical switching devices commonly used in homes to control the turning on and off of power. However, in the process of using it, we sometimes find that the wall switch fails to energize. There are many reasons for wall switches not energizing, and the common reasons and how to detect them are described in detail below.

One, Causes:

1. power supply failure: power supply failure is one of the common causes of wall switches not energized. When the home power supply fails, the wall switch may be affected, so that it can not be properly energized.

2. Poor switch contact: After a long time of use, the contact points of the wall switch may be oxidized, poor contact and other problems, resulting in the current can not be properly conducted, so that the switch can not be energized.

3. Line failure: If the circuit where the wall switch is located fails, such as line disconnection or short-circuit, etc., it will lead to the switch can not be energized.

4. Switch damage: After a long time of use, the internal switch components of the wall switch may be aging or damaged, resulting in failure to energize the switch normally.

Second, detection:

1. Check the power supply: first of all, you need to check whether the power supply is normally powered. You can use a voltmeter or power tester to test the power supply. If the voltage is lower than the normal range or non-existent, you need to check whether the home circuit is functioning normally, such as whether the home fuse is tripped and the circuit breaker is triggered.

2. Check the switch contact points: Remove the wall switch and check if the switch contact points are oxidized, peeled off or have poor contact. You can use a multi-purpose tester or multimeter to measure the resistance between the contact points, which should be close to zero ohms under normal circumstances.

3. Check the wiring: If the switch contact points are normal, you can further check the wiring associated with the switch. A wire tester can be used to test the wiring and check for disconnections, shorts, or grounding problems. Additionally, the wiring can be checked for damage or corruption, such as visible external cuts or stripping.

4. Replace the switch: If all of the above have been ruled out as possible causes, then the wall switch itself may have been damaged. At this point, the switch can be replaced to test if power can be restored.