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1. R Variable Frequency Fault (01) Machine Model: KFR-35GW/BPY-R Fault Phenomenon: Large noise from the outdoor unit. Reason Analysis: After the maintenance personnel arrived, the air conditioner was tested. When the air conditioner was turned on, everything was normal. When the temperature difference between the set temperature and the indoor temperature was large, the compressor was running at high frequency, and the current sound from the outdoor unit started to increase, with a vibration phenomenon. It was found that the copper pipe of the outdoor unit was touching the shell. After adjustment, the noise decreased, but the compressor emitted a rising frequency sound during operation. Solution: Explain to the user that the sound produced by the variable frequency machine during rising frequency is normal. Experience Summary: It is difficult to avoid the large current sound produced during high-frequency operation of the variable frequency machine, and it should be explained to the user that the rising frequency time is short.
ID: 020102 Machine Model: KFR-35GW/BPY-R Fault Phenomenon: The entire machine does not start after power on, and the display shows E1 code. Reason Analysis: Check that the power connection is normal, and the fault code indicates a communication failure with the indoor unit. Using a multimeter, the power sent from the indoor mainboard to the outdoor unit is normal, and there is also an excitation signal on the S terminal, indicating that there is no communication fault between the indoor and outdoor units. Considering that the outdoor unit often has many factors causing faults, the outdoor unit shell was opened, and it was found that the capacitor on the outdoor power board had obvious explosion phenomena. Further analysis indicated that the cause of the capacitor explosion might be a fault in the rectifier bridge. Using a multimeter, the resistance between the positive and negative of the rectifier bridge was zero, indicating a short circuit in the rectifier bridge. At the same time, the outdoor power board and rectifier bridge were replaced, and the machine was tested normally.
Solution: Replace the outdoor power board and rectifier bridge. Experience Summary: There are many causes of E1 faults, and the fault code only represents a range. The causes of capacitor explosions in variable frequency outdoor units are generally due to problems with the capacitor itself and faults in the rectifier bridge.
ID: 020103 Machine Model: KFR-35GW/BPY-R Fault Phenomenon: The indoor unit works after power on, the outdoor unit fan works, but the compressor does not start, and there is no fault code displayed. Handling Process: Based on the fault phenomenon, it should be a problem with the compressor or the outdoor unit control board. Check the user’s power supply, and the voltage fluctuates around 220V, which should be normal. Open the outdoor unit and measure the DC voltage of the outdoor main control board to be 310V, and upon measuring again, the 5V voltage output from the module is absent, indicating that the module is faulty. Solution: Replace the variable frequency module. Experience Summary: Whether there is a fault code or what content is displayed is not very important; what is important is to patiently check and analyze each component.
ID: 020104 Machine Model: KFR-35GW/BPY-R Fault Phenomenon: After power on, the display shows P0 (module protection). Reason Analysis: Based on the fault code, it is determined that the outdoor variable frequency module is faulty. After measuring, the outdoor variable frequency module is normal, and the mainboard is working normally. Upon careful inspection, it was found that the user’s voltage fluctuated greatly, but the voltage fluctuation should show “P1” protection. After testing the machine for an hour, it was found that the user’s instantaneous voltage fluctuation was too large, causing module protection. It is recommended that the user install a voltage stabilizer and then test the machine normally.
Solution: Recommend the user to install a voltage stabilizer.
Experience Summary: Before maintenance, carefully check the user power supply voltage (load voltage, voltage measurement after compressor operation).
SB”T
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