Analysis by Lukas & Team
Troubleshoot LG ThinQ AC CH 45 error in Canada. Diagnose condenser coil thermistor issues & restore cooling efficiency. Expert guide and safety tips.
Lukas leads the technical research department at Digital Home Faults. Together with a team of systems analysts, he specializes in translating complex manufacturer error codes into actionable diagnostic steps for the Canadian market.
Multimeter, Screwdrivers, Wire Strippers, LG Service Manual, ThinQ App, Replacement Thermistor, Replacement Control Board (if necessary)
The LG service manual can be found on the LG website or through a reputable appliance parts supplier. You will need the model number of your AC unit to find the correct manual.
Yes, a refrigerant leak can cause abnormal coil temperatures, which can trigger the CH 45 error. If you suspect a refrigerant leak, contact a qualified HVAC technician to inspect and repair the leak.
Always disconnect power to the AC unit before performing any maintenance or repairs. Work on high-voltage circuits should only be performed by qualified technicians. Ensure secure password management for the ThinQ app to prevent unauthorized access to the AC unit and other smart home devices. Protect the outdoor unit from physical tampering during the winter months.
If the CH 45 error persists after replacing the thermistor, try performing a full reset of the LG ThinQ AC unit. Disconnect power to the unit, then press and hold the reset button on the control board for 15 seconds while reapplying power. This will clear the unit's memory and may resolve the error.
The LG ThinQ AC uses a network of thermistors to monitor refrigerant temperature at various points in the cooling cycle. The condenser coil middle thermistor is responsible for providing temperature feedback to the control board, allowing for optimized compressor and fan operation. The thermistor is connected to the main control board via a low-voltage DC circuit (5V). Failure of the thermistor, wiring, or the control board itself can trigger the CH 45 error. The system relies on a 2.4GHz Wi-Fi connection to the home network (Bell Giga Hub or Rogers Ignite).