**Title: AUX Air Conditioner - High Noise from Indoor Unit**
**Fault Phenomenon:** A KFRd-72LW air conditioner has high noise from the indoor unit.
**Repair Process:** The user reported that the newly installed outdoor unit of the air conditioner was making a lot of noise. The service center adjusted the outdoor unit according to the company's technical modification notice, and the noise issue was resolved. However, the user then complained about high noise from the indoor unit. The service center replaced the indoor unit, but the improvement was not significant, leading to a user complaint. Upon further inspection by the center, it was found that the noise was caused by resonance between the indoor motor and the rear guard plate. By adding PE vibration damping pads (or thermal insulation cotton) between the indoor motor and the rear guard plate, the resonance noise was eliminated, and the user was satisfied.
**Repair Measures:** Add PE vibration damping pads (or thermal insulation cotton) between the indoor motor and the rear guard plate to eliminate resonance.
**Conclusion:** Although there is no standard for checking decibels in non-professional settings, the issues raised by users are also the problems we need to solve. The solution is reasonable as long as the user accepts it.
**Source Article:** http://blog.sina.com.cn/aokesikw