The AP fails to start

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Perform the following operations to handle AP start failure:
1. Observe the status of the AP power indicator or the information output through the serial port to determine whether the AP is not powered on or the AP cannot start after power-on.
- If the AP can be powered on but cannot be logged in, contact Huawei technical support.
- If the AP cannot be powered on, go to step 2.
2. Check the AP's power supply mode.
- If the DC power adapter is used to supply power to the AP, check the source of the power adapter.
- If the power adapter is supplied with the AP, go to step 3.
- If the power adapter is purchased from another vendor, check whether its rated output voltage and current meet the requirements for Huawei AP products. If not, replace the power adapter. It is recommended that you use the power adapter supplied with the AP.
- If PoE is used to supply power to the AP, see "Why Does an AP's PoE Fail to Be Powered On" in Huawei support website.
- For AC power supply, use a multimeter to check whether the cable connection is normal and whether the output voltage of the power supply meets AP requirements. You can also perform a cross test using other AC power supply devices. If the output voltage of the power supply does not meet AP requirements, contact Huawei technical support.
3. Perform a cross test on the AP using the DC power adapter.
- If the AP cannot be powered on, contact Huawei technical support.
- If the DC power adapter is faulty, replace it.

Other related questions:
The AP fails to start
Perform the following operations to handle AP start failure: 1. Observe the status of the AP power indicator or the information output through the serial port to determine whether the AP is not powered on or the AP cannot start after power-on. - If the AP can be powered on but cannot be logged in, contact Huawei technical support. - If the AP cannot be powered on, go to step 2. 2. Check the AP's power supply mode. - If the DC power adapter is used to supply power to the AP, check the source of the power adapter. - If the power adapter is supplied with the AP, go to step 3. - If the power adapter is purchased from another vendor, check whether its rated output voltage and current meet the requirements for Huawei AP products. If not, replace the power adapter. It is recommended that you use the power adapter supplied with the AP. - If PoE is used to supply power to the AP, see "Why Does an AP's PoE Fail to Be Powered On" in Huawei support website. - For AC power supply, use a multimeter to check whether the cable connection is normal and whether the output voltage of the power supply meets AP requirements. You can also perform a cross test using other AC power supply devices. If the output voltage of the power supply does not meet AP requirements, contact Huawei technical support. 3. Perform a cross test on the AP using the DC power adapter. - If the AP cannot be powered on, contact Huawei technical support. - If the DC power adapter is faulty, replace it.

A PoE-powered AP fails to be started
If an AP powered by a PoE switch fails to start, perform the following operations to locate the fault: 1. Check whether the PoE switch complies with the PoE power supply standard specified in Product Description of the AP. If the PoE switch does not comply with the standard, use a PoE switch that complies with the standard. If a Huawei PoE switch is used, run the display poe power command in the system view to check the power supply standard specified by the USMPW field in the command output. The value 15400 indicates that the PoE switch complies with 802.3af, and the value 30000 indicates that the compliance with 802.3at. 2. Check whether the switch is grounded properly. 3. Check whether the PoE function is enabled on the switch. For example, if a Huawei PoE switch is used, run the display poe power-state interface gigabitEthernet 0/0/3 command in the system view to check whether the PoE function is enabled on GE0/0/3. If the Port power enabled field displays Enable, the PoE function has been enabled on the interface. If the PoE function is disabled, run the poe enable command in the interface view to enable the PoE function. 4. Check whether the remaining output power of the switch meets the AP's requirements. If not, increase the switch's power or power off unused PDs on the switch. If a Huawei PoE switch is used, run the display poe information command in the system view to check the remaining output power specified by the Available Total Power field. For an AP in compliance with 802.3af/3at, the remaining output power of the switch must be greater than or equal to 15400 mW. For an AP in compliance with 802.3at, the remaining output power of the switch must be greater than or equal to 30000 mW. 5. Check whether the PSE chip on the switch is compatible with the PD chip on the AP. You can power on the AP forcibly, or install patches after confirming with Huawei technical support personnel. If a Huawei S23XX/S27XX PoE switch is connected to an AP in V100R003, their chips may be incompatible with each other. You can use either of the following methods to solve the problem: Run the poe force-power command in the interface view to power on the AP forcibly. Install the V100R005SPH015 patch. 6. Check whether the network cable meets the requirements of the PoE power supply standard. The total cable resistance is no more than 20 ohms according to IEEE 802.3af and 802.3at Type 1, and no more than 12.5 ohms according to IEEE 802.3at Type 2. If the network cable does not comply with the PoE power supply standard, replace the network cable. Use a network cable tester or multimeter to measure the resistance at both ends of the network cable. Alternatively, connect the network cable to an AP at one end, and use a multimeter at the other end to test the resistance between pins 1 and 2 (or between pins 3 and 4, 5 and 6, or 7 and 8). The cable resistance approximately equals the half of the displayed value. If an AP powered using a PoE adapter fails to be started and the network cable is connected properly, perform a cross test to check whether the PoE adapter is faulty. If the PoE adapter works properly, contact the Huawei technical personnel.

The AC fails to start
Two scenarios for AC start failure are as follows: - The AC can be powered on but cannot start, and the serial port does not display information. Rectify this fault by performing the following steps: 1. Check whether the power module functions properly. a. Measure the input voltage. Use a multimeter to measure the input voltage of the power module, and check whether the input voltage is in the operating voltage range of the power module. b. Remove and reinstall the power module. Unplug and plug the power module and its power cable to ensure that they are securely installed. c. Perform a cross test of the power module. Move the power module to another AC or replace it with another power module that can work normally in another AC, to determine whether the power module or the AC itself is faulty. If the test proves that the power module is faulty, send the power module back for repair. d. If the fault still occurs on the AC after the cross test, contact Huawei technical support. 2. Check whether there is obvious yellow mark on the interface. If the color of the connector turns yellowish, the fault may be caused by lightning strikes or surge current. The internal CPU chip may be damaged. In this case, dial Huawei customer service hotline and return the AC for repair (select the cause: F009 unexpected damage). Note: To protect the AC from lightning strikes or surge voltage, install a surge protector or a voltage stabilizer to ensure a stable running environment. 3. If there is no obvious mark, contact Huawei technical support. - The AC can be powered on and the serial port can display information, but the AC cannot start. a. If information can be displayed through the serial port, press Ctrl+B to enter the BootROM menu during the startup. Then, press CTRL+E to enter the test menu to check whether the SDRAM and flash memory are faulty. If so, dial Huawei customer service hotline and return the AC for repair. b. If not, dial Huawei customer service hotline or contact Huawei maintenance engineers to determine whether to upgrade the AC software or change other configurations. c. If the fault persists, contact Huawei technical support personnel.

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