LG heat-pump — LG residential air conditioners covered by the United States help-library article grouping these codes as outdoor compressor or circuit board problems Error Codes Directory

LG CH21, CH23, CH26 and CH29: the outdoor compressor and board group

LG's help-library article assigns CH21, CH23, CH26, CH29 and E9 to a single category: a problem with the outdoor unit compressor or circuit board. That is a narrower statement than it appears, because it moves the fault out of the indoor unit and out of the sensing group and places it in the inverter drive and compressor side of the system. Applies to: LG residential air conditioners covered by the United States help-library article grouping these codes as outdoor compressor or circuit board problems What is quoted below is the category LG gives home customers in its United States help library, and nothing finer. LG service literature publishes fuller definitions for each of these codes, and the meaning of a CH number on LG commercial or variable refrigerant flow equipment is taken from that product's own manual rather than from this article. Owner-safe checks: Make one start attempt after LG's five-minute power interruption, and count how many seconds the outdoor unit runs before it stops. | Observe whether the outdoor fan turns at all during the attempt, from a safe distance and without touching the guard. | See whether a breaker or fuse serving the outdoor unit has tripped, and whether anything else in the property is misbehaving at the same time. Qualified technician: LG instructs the owner not to disassemble the unit or replace internal parts, warning of fire, electric shock, serious injury, or death. | Measuring compressor windings, inverter output, and supply voltage under load are energised tasks inside the outdoor enclosure and belong to a qualified engineer.