This document is the service manual of LG indoor air conditioner
This service manual provides authorized technicians with detailed information on LG indoor air‑conditioner units of the ARNU and URNU series. It includes safety precautions, model identification, external appearance, nomenclature, and a complete list of indoor unit types such as ceiling‑mounted cassette, wall‑mounted, and floor‑standing models.
The document also contains extensive troubleshooting guidance, self‑diagnosis error codes, and step‑by‑step repair instructions for components like the BLDC fan motor, PCB, and drain pump, as well as specifications for cooling capacity, electrical ratings, and operation modes.
| Total Cooling Capacity | 5,000 Btu/h – 18,000 Btu/h |
|---|---|
| Electrical Rating (Model 1) | 1 Ø, 115 V, 60 Hz |
| Drain‑head Height | up to 700 mm |
Both the indoor and outdoor fan stop during defrost.
After replacing the indoor unit PCB, the technician must perform auto addressing and input the address of the central control.