LG CH22

Critical

Multi V5 — Outdoor unit AC inverter board input overcurrent (RMS) error (Master: 221, Slave 1: 222, Slave 2: 223).

LG CH22: Outdoor unit AC inverter board input overcurrent (RMS) error (Master: 221, Slave 1: 222, Slave 2: 223). This fault typically halts operation and needs immediate attention.

Possible causes

Pipe clogging, defective EEV, blocked indoor/outdoor unit airflow, or refrigerant overcharge causing compressor overload
Compressor motor or winding insulation damage, low input voltage, or improper power wiring/damaged inverter PCB

Check steps

Inspect piping for blockages/damage, confirm indoor/outdoor units are unobstructed, and verify EEV operation and refrigerant pressure
Test resistance and insulation between compressor terminals, and inspect power wiring/terminal connections for damage

Affected parts

Compressor
EEV (electronic expansion valve)
Inverter PCB
Power wiring

Safety note

High voltage — disconnect power supply before testing the compressor or inverter PCB.

Source: LG resmi servis kilavuzu (bagimsiz cift-dogrulandi) — LG Multi V5 Service Manual (ManualsLib doc #1483751), Error No. 22 section (page ~146 in ManualsLib viewer, not p.126): "Outdoor unit AC inverter board input overcurrent (RMS) error — Master: 221, Slave 1: 222, Slave 2: 223. The three-phase input power current for the inverter PCB assembly is >22A."

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

Look up in Enthalio →

Related fault codes

Outdoor unit inverter board IPM fault error (MCH21 Hydro kit inlet pipe temperature sensor communCH17 Communication error between outdoor unit main CH57 Outdoor unit inverter PCB EEPROM error (MasterCH60 High temperature at the outdoor unit inverter CH62 Outdoor unit fan has locked up (Master: 671, SCH67