Q: However, there is no fan fault alarm code displayed on the UPS. How can this be explained?
A: In some cases, the "Fan Fault" alarm has been disabled via the MTR software, which is why the code is not shown.

Q: How can I resolve the fan abnormal noise issue?
A: Please follow the solutions below:
1.Connect to the UPS using MTR software and configure the parameters as follows:
1）Path 1: ServSetting → System Setting → 3-level Fan Speed Control → Select Enable
Note: If set to Disable, fan speed will increase significantly, resulting in louder noise.
2）Path 2: Rated Setting → System Code Setting 1 → Check FanFailBzOnEn → Restart the equipment.
After rebooting, check if fault code 53 (fan fault code) appears on the UPS screen.
Note: If a fan fault or code 53 occurs, the fan will run at maximum speed, causing increased noise.

Summary:If 3-level fan speed is enabled and fan fault alarm is checked, the fan will operate at the lowest speed level and noise under normal working conditions.