Title: Loose Fixing Screws of Haier Air Conditioner Blades Causing Loud Noise - Maintenance Process
Fault Phenomenon: High noise from the indoor unit.
Cause Analysis: The user had just installed a new air conditioner. There was no noise during the initial testing phase, but after using it for a month, noise issues began to appear. At that time, the maintenance personnel suspected it might be due to installation problems or foreign objects entering the indoor ductwork. After opening the casing of the indoor unit for inspection, they could not find the source of the noise. When manually rotating the fan blades, it was found that the blades were slightly loose on both sides. Upon further examination, it was determined that the loosening of the fixing screws caused the blades to move back and forth, leading to contact and friction with the housing, thus generating noise. After adjusting the position of the blades and tightening the fixing screws, the test run returned to normal.
Maintenance Measures: Adjusted the position of the fan blades and tightened the fixing screws.
Summary of Experience: If there is noise even when ventilation is turned on, the focus should be on checking whether the fan blades are loose.
Source Article: http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3467495