How to use the mobile phone in the second volume of the third grade handwritten newspaper

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Summarizes the common fault analysis and troubleshooting methods of air conditioning. I hope beginners will try not to take detours and be confused by some theoretical books. In fact, they have never practiced it at all. They can list many reasons for a problem, but they don't want it. 90% has been changed by those things. Please correct me.

1, air conditioning does not turn on, there are two main types, the first is no response when power is on, transformer, fuse, rectifier bridge, etc. These should be pediatric things, and important measuring voltages such as 5V are normal. Most of this problem can be solved by changing the crystal oscillator next to the CPU. There is also a buzzer when plugging in, which can be done manually without turning on the remote control. Basically, the receiver head is broken, and it won't be found online. It is easy to find the anchor of the receiving plate. It is easy to find the negative pole of the capacitor or the wide circuit of the circuit board, and it is also easy to find the other two feet of the anchor.

2. The air conditioner automatically switches on and off from time to time, and some make phone calls in the middle of the night. Cleaning the receiving plate, replacing the receiving head or removing the automatic transfer switch can basically kill it.

3. The external machine automatically stops for several minutes or tens of minutes after starting, or the external machine does not start the indoor pipe temperature sensor.

4, boot display all kinds of fault codes, hehehe, I don't think you can remember all the air conditioning codes, I never remember fault codes, teach you the trick, 1 test the internal and external machine connection lines. 2 measuring sensor. 3 Measure the power supply voltage.

4. Switch to 380V, check whether it is out of phase, and observe whether the current and indoor and outdoor machines are too dirty. I believe that ordinary problems can be solved.

5. The outdoor unit cannot be started, or only one fan is running outdoors. For beginners, capacitance is generally not good, and other problems will be analyzed in detail.

6. Thermal protection after the compressor starts for a period of time. I believe this is the biggest headache for all air conditioners. This problem cannot be solved normally by conventional methods. It is best to replace the compressor when the heat dissipation and voltage of the system are normal. Don't waste time. Time is money. Don't listen to many methods mentioned in some magazines. I have used them all, and the success rate is very low. This is unnecessary. Some people will change the capillary, so don't do anything. In addition, this is a professional ethics issue.

7. The fault code displayed when the power supply is plugged in is different from that displayed after operation. Plug-in display is generally a problem with power supply or signal line and motherboard. Running the monitor for a while is usually a sensor problem.