Wuxi Aux Air Conditioning Maintenance Telephone

Aux air conditioning 24-hour customer service hotline: 400 1-657-898? People occasionally encounter various problems in the process of using air conditioners, such as the display of E3 when the air conditioner is turned on. Generally, when we encounter this situation, we only need to find the fault meaning represented by E3 code according to the user manual, and then carry out targeted troubleshooting and maintenance, which will soon solve the problem. Usually, the air conditioner shows E3 fault, which means overvoltage and undervoltage protection. Overvoltage and undervoltage protection are usually for the following reasons.

First, the refrigerant is insufficient. We need to check whether the refrigerant is insufficient, and then add the refrigerant appropriately. Then restart the test to see if the fault is solved.

Second, it may be the radiator of the air conditioner. The filter screen has not been cleaned for a long time, and there is a lot of dust and foreign matter on the surface, which leads to insufficient heat dissipation and low heat dissipation efficiency, triggering undervoltage protection. At this time, the filter screen should be removed and cleaned, and the radiator should also be cleaned, then dried and put back to start the test again.

Third, if all the above are all right, then you need to check the reasons from the inside of the air conditioner. We need to confirm whether it is an internal machine or an external machine first. The specific operation is as follows: disassemble the air conditioner shell, short-circuit the LPP plug on the main control board and the zero line on the main board, and observe whether the indoor unit operates normally. If it is normal, it means that the outdoor unit has a high failure probability and needs to be checked. Mainly check the connecting wires, plugs and low-voltage switches of indoor and outdoor machines. Use multimeter to short-circuit LPP to protect the first line and the zero line of outdoor unit. If the resistance value is zero, the fault is in the low-voltage switch. It is generally difficult to repair the fault of low-voltage switch, which is time-consuming and laborious. It is recommended to change it directly to a new one, and it won't cost much. If the resistance is normal. It means there is something wrong with the circuit. It is necessary to short-circuit all electronic components on the circuit board with a multimeter, and judge whether electronic components are damaged, especially capacitors, according to the change of their resistance values. If electronic components are damaged, it is recommended to replace the circuit board directly, because the replacement of electronic components is also more troublesome.

Through the above investigation, we can generally find the cause of the fault, the external fault is relatively easy to solve, and the investigation of the internal circuit and motherboard of the air conditioner is more complicated. It is recommended to find specialized maintenance personnel to solve it.