LG Aircon Error Codes and Their Meanings: Complete Diagnostic Reference

LG Dual Inverter air conditioning systems utilize **CH (Check)** error codes displayed on the indoor LED screen or signaled via blinking light counts on non-display models. When a operational anomaly occurs, the control board halts cooling and presents a two-digit CH code. Understanding common LG CH error codes allows Singapore homeowners to identify whether an issue involves simple airflow restriction, sensor faults, or inverter board protections. ## Master LG CH Error Code Reference Guide ### Sensor & Communication Fault Codes * **CH01 / CH02:** Indoor room air thermistor or pipe thermistor open/short circuit. * **CH05:** Communication signal line failure between indoor and outdoor control PCBs. * **CH06:** Outdoor heat exchanger pipe thermistor circuit anomaly. * **CH10:** Indoor BLDC fan motor rotation failure or Hall sensor feedback lock. ### Inverter & Compressor Protection Codes * **CH21:** IPM (Intelligent Power Module) DC peak current protection trigger (overcurrent across inverter power transistors). * **CH22:** Input AC overcurrent protection trigger (excessive electrical current draw). * **CH38:** Refrigerant shortage protection trigger (low system gas pressure causing high compressor discharge temperatures). * **CH61:** Condenser coil high-pressure thermal overload (outdoor heatsink temperature exceeding safe limits). Review how [LG CH61 blinking errors](/blog/lg-aircon-ch61-blinking-error-explained) relate to outdoor condenser coil heat dissipation. ## Deciphering Non-Display LG LED Blink Counts On LG models without a digital temperature display, error codes are communicated by counting flashes on the **Power LED** (tens digit) and **Timer LED** (ones digit): * **5 Power LED Flashes + 0 Timer LED Flashes:** Represents Code **CH05**. * **1 Power LED Flash + 0 Timer LED Flashes:** Represents Code **CH10**. * **3 Power LED Flashes + 8 Timer LED Flashes:** Represents Code **CH38**. Residents across [Jurong West](/locations/jurong-west) and [Tampines](/locations/tampines) can share retrieved CH codes when requesting a service appointment. ## Professional Technical Verification & Care While retrieving CH codes identifies fault categories, resolving underlying issues requires a hands-on physical inspection by a qualified engineer. Visiting technicians evaluate wiring connections, test sensor resistance curves, and check heat exchanger cleanliness safely. All repairs are performed in full compliance with LG technical specifications and safety standards. ## Frequently Asked Questions (AEO/SEO Snippet) ### Q: What does error code CH38 mean on an LG aircon? **A:** Code CH38 indicates a refrigerant shortage detected by compressor discharge temperature sensors, preventing cooling operation until gas levels and physical leaks are addressed. ### Q: What should I do if my LG aircon displays CH05? **A:** Code CH05 indicates a communication failure between indoor and outdoor PCBs. Perform a 15-minute power isolator reset. If the code persists, a physical wiring check is needed. ### Q: Can a dirty indoor coil cause LG code CH10? **A:** Yes. Severe dust accumulation on the blower wheel increases rotational resistance, causing the fan motor Hall sensor to trigger code CH10.