**English Translation:**
The Haier KFR-58LWE(BPJXF) air conditioner displays a fault code E1.
**Model:** KFR-58LWE(BPJXF)
**Fault Phenomenon:** The user originally reported the fault as displaying E1. After the service center replaced the module and compressor, the original fault was resolved. However, when the machine was operating, the set temperature could only be fixed at 16°C and could not be adjusted upward. Whenever the remote control was used to adjust the temperature, the system would either stop cooling or experience frequency reduction.
**Repair Process:** Upon inquiry with the repair technician about the entire repair process, it was found that after the repair, the set temperature could only be fixed at the lowest setting. If the set temperature was increased, the compressor would either reduce its frequency or shut down. This fault clearly indicated a temperature detection protection phenomenon. After replacing all the sensors on the machine, the problem still persisted, leaving the service center at a loss. During an on-site inspection, it was discovered that the pressure was abnormally low while the machine was running, and the high-pressure pipe of the indoor unit felt extremely cold, almost reaching freezing or frosting conditions. Since the compressor had been replaced, the repair technician insisted that the refrigerant had been added in the correct amount. However, the machine clearly showed signs of insufficient refrigerant in the system, with no issues such as dirt blockage. After re-adding the correct amount of refrigerant, the machine functioned normally. At this point, the repair technician hesitantly admitted that due to the depletion of R22 at the service center, the refrigerant had not been adequately added at the time, and since there was no frost formation after installation, it was assumed that the fault was not caused by a lack of refrigerant, leading to the delay in resolving the issue.
**Repair Measures:** Re-added the correct amount of refrigerant, and the machine returned to normal operation.
**Summary:** When guiding the service center in repairs, we should not completely rely on the words of the repair technicians. Sometimes, they may not have actually measured or tested anything, but when asked, they might claim to have checked and found everything normal, leading to incorrect judgments. Here, I also remind all repair technicians: when seeking advice, please truthfully describe the fault phenomena and your repair status to avoid unnecessary detours in the repair process.
**Source of Article:** http://blog.sina.com.cn/haierkongt