air conditioner air outlet does not refrigeration compressor does not start?
What's the matter if the air conditioner is in the air conditioner's hair dryer and the external unit does not start? Today Zhao Yu will tell you how to repair the air conditioner without cooling and the external unit does not start. Then it is relatively simple for such failures that do not start.
external unit power supply
First we need to measure whether there is a power supply on the terminal of the external unit. If there is electric on the external unit terminal, it means that the connection line between the internal unit and the internal and external unit is good. The external unit power supply is normal and the external unit does not rotate. The problem lies in the external unit. So what problems can cause the external unit to fail to rotate? There are mainly the following reasons:
1, the external unit compressor is damaged, and the external unit compressor does not rotate, resulting in no cooling.
2, the capacitor of the external compressor is damaged, resulting in the external compressor not rotating and not cooling.
3, the fan of the external fan does not turn, causing the external fan to be unable to dissipate heat and lead to no cooling.
4, the external fan capacitor is damaged, causing the external fan to not rotate, resulting in no cooling.
5, heating and cooling air conditioner, the external unit has four-way valve , and the external unit has 4-way valve bleeds, resulting in the air conditioner not being cooled.
So if the external unit fails, there are 3 components for the external unit fixed frequency air conditioner. 1. Compressor. 2. Heat dissipation fan. 3. Four-way valve. Among them, both the compressor and the fan have a starting capacitor. We can find the fault point after careful inspection. The above is that the external unit has electricity and the external unit does not start, resulting in the air conditioner not being cooled.
Let’s talk about it below. There is no electricity on the terminal of the external unit, the air conditioner does not turn, and the air conditioner does not cool down. does not have it for the external unit. We may judge that the fan does not supply power to the external unit and the fault occurs on the internal unit. We need to check the connection cables between internal and external units to see where the problem lies. Then Zhao Yu listed the reasons why the air conditioner external unit has no power:
1, the remote control is set incorrectly, causing the external unit to not start. When setting the remote control, we should pay attention to setting the temperature. When cooling, if our setting the temperature is too high, the external unit will not be able to start. We can set the set temperature to 18 degrees, try again to see if the external unit can operate, that is, our set temperature must be lower than the indoor temperature before the external unit can start. At the same time, it should be noted that when our machine is just started, there is a delay start function. We have to wait for a while before the external unit will start.
2. If we set it correctly, wait for a while and the external unit still cannot start. We need to check whether the internal and external unit connection wires are broken. We just need to measure whether there is an electrical output on the terminals that the internal unit supplies power to the external unit. If there is an electrical output on the terminals of the internal unit and there is no electrical input on the external unit terminal, then the internal and external unit connection wires are broken. Some of the customers installed on the first floor of the air conditioner have been bitten by mice. There are still quite a lot of them. We need to check them carefully.
3. If the remote control is set normally, the connection cable will not be broken. Then the fault occurs on the computer board of the internal computer. Then, we need to check the peripheral components of the computer board at this time. Including: room temperature probe, tube temperature probe. At the same time, we need to monitor the compressor current, if it is normal. We can confirm that the compressor computer board is damaged, so we need to replace the original compressor computer board or replace the universal computer board. So where can the computer board cause the external unit to not transmit power? Zhao Yu said: 1. The compressor relay is damaged, causing the power supply of the external unit compressor to be interrupted. 2. The inverter that drives the compressor relay is damaged. Or the working conditions of the inverter are not met. Power supply, grounding, crystal oscillator damage, etc. 3. The CPU of the computer main control board is damaged.
computer board schematic
