Check that the blue wire is intact s4

**Changhong KFR-72LW Console Air Conditioner, after turning on, the display shows H3.**

**Analysis and Inspection:** The KFR-72LWlM console air conditioner displays H3 on the screen. H3 indicates that the operating current of the compressor cannot be detected. A preliminary judgment is made that the blue wire of the AC contactor may have broken, or the AC contactor itself may be damaged, leading to issues such as the contactor not engaging and the outdoor electronic control board being damaged. After removing the outer casing of the outdoor unit, it was found that the blue wire was intact. When measuring the resistance value of the AC contactor coil, it was discovered to be infinite, indicating that the coil had burned out.

**Repair Method:** Replace the AC contactor coil with one of the same model, and the fault will be resolved.

**Warm Reminder:** Maintenance personnel should note that the blue wire must pass through the choke coil on the outdoor unit's electronic control board.

**Source of Article:** http://blog.sina.com.cn/changhongktiao