1. The abnormal noise of the blower is mostly caused by insufficient lubrication of the bearing. Just apply some grease to the blower bearing. The bearing of the blower needs lubrication. If it is not lubricated for a long time, the blower will have abnormal sound.

2. Abnormal sound is accompanied by the change of air volume. In this case, it is likely that there is a foreign body in the blower, so it can be cleaned up. If the abnormal noise still exists after cleaning, it is necessary to disassemble the blower to check the specific fault cause.

3. the abnormal sound caused by the vibration of air flow in the pipeline. Turn off the air conditioning compressor, turn on the blower, and adjust the air volume and direction.