不开机现象
No startup phenomenon
1、空调不开机，不开机主要有2种，第一就是上电没有任何反应，【变压器，保险管，整流桥】这些应该是小儿科的事情，重要的测量5V等电压都正常这种问题大部分换晶振【就在CPU旁边的】可以解决。
1. There are two main types of air conditioning that do not turn on: the first is that there is no response when powered on, such as transformers, fuses, and rectifier bridges. These should be matters for children, and important measurements such as 5V voltage are normal. Most of these problems can be solved by replacing crystal oscillators [located next to the CPU].
还有一种是插电有蜂鸣声，遥控不开机【手动可以】基本就是接收头坏【换接收头不会再网上搜下就知道，找接收板的地脚很容易吧，电容的负极或者电路板很宽的那条线，找到地脚其他两脚就很容易哦】、
Another type is that there is a buzzing sound when plugged in, and the remote control does not turn on [manual operation is acceptable]. Basically, the receiver head is broken [replacing the receiver head will not be searched online, so it is easy to find the grounding of the receiver board. It is easy to find the negative pole of the capacitor or the wide line of the circuit board, and it is easy to find the other two pins of the grounding]
2、空调不定时自动开关机，有的半夜叫，清洗接收板，换接收头或者拿掉自动转换开关基本可以通杀。
2. The air conditioner automatically switches on and off at irregular times, and some call in the middle of the night. Cleaning the receiver board, changing the receiver head, or removing the automatic transfer switch can basically turn it on and off.
3、开机几分钟或者数十分钟外机自动停机，或者外机不启动换室内管温传感器。
3. The external unit automatically shuts down after a few minutes or tens of minutes of startup, or the external unit does not start to replace the indoor pipe temperature sensor.
4、开机显示各种故障代码，呵呵呵，想必你无法记住所有的空调代码吧，本人从不记故障代码，教你绝招，1测内外机连接线。2测传感器.3测电源电压.4换向【380V电】，查是否掉相.
4. Turn on the computer and display various fault codes. Hahaha, you may not be able to remember all the air conditioning codes. I never remember fault codes, and I teach you a trick: 1. Test the internal and external connection cables. 2. Measure the sensor. 3. Measure the power supply voltage. 4. Reverse the current to 380V and check for phase loss
观察电流和室内外机是否过脏，相信一般问题都可以解决。
Observe whether the current and indoor and outdoor units are too dirty, and I believe that general problems can be solved.
5、开机室外机不启动或者外面只有风扇转，对于初学者一般是电容坏，其他问题再具体分析。
5. If the outdoor unit does not start when turned on or only the fan is running outside, it is usually due to a broken capacitor for beginners. Other issues will be analyzed in detail.
6、开机一段时间压缩机热保护，相信这是所有维修空调的最头痛的问题，这种问题按常规办法解决不能正常的，确认系统和电压散热正常的情况下，最好换压缩机，别浪费时间，时间就是金钱，别听有些杂志说的一大堆方法，那些方法我都用过，成功率很低，没有必要，有的人改短毛细管，千万不要怎么做，职业道德问题，而且影响空调效果。
6. After turning on the compressor for a period of time, it is believed that this is the most troublesome problem for all air conditioning repairs. This problem cannot be solved normally by conventional methods. After confirming that the system and voltage heat dissipation are normal, it is best to replace the compressor. Don't waste time, time is money. Don't listen to a lot of methods mentioned in some magazines. I have used all of them, and the success rate is very low. It is not necessary. Some people change the short hair tube, Don't do anything, it's a matter of professional ethics and it affects the air conditioning effect.
7、还有就是一插电就显示故障代码和运行后显示故障代码是不一样的，插电显示一般是电源或者信号线，主板问题。运行一段时间显示一般是传感
7. There is also a difference between displaying the fault code as soon as it is plugged in and displaying the fault code after operation. Plugging in usually displays a power or signal cable, or motherboard issue. Running for a period of time usually displays sensing