The LG aircon error code CH21 signals the presence of a complicated technical fault involving excessive current flow in the inverter DC power circuit and an inverter compressor that has reached high temperatures. The user interface display of your LG air conditioning unit shows the error code if it detects that the current has exceeded 14 amperes in the DC part of the circuit. Possible causes for the CH21 error may include a power surge, lightning storm, malfunctioning sensor or thermistor, failing compressor, poorly ventilated outdoor sub-unit, and something as inconspicuous as a dirty filter that any aircon maintenance servicing can address.
There’s a good chance the CH21 error on your LG aircon display can be cleared by simply resetting the circuit breakers and prevented by routinely applying the Housing & Development Board of Singapore’s aircon maintenance suggestions.
Begin troubleshooting the CH21 fault by turning off the AC, unplugging it from the power outlet, and cleaning the indoor fan coil unit, especially the air filter. A dirty filter effectively restricts the flow of air and leads to an overheated compressor. Make a thorough inspection of the outdoor unit, as well. Ensure that the compressor is in an open, well-ventilated area with no physical obstructions to the air flow. Open the AC cover of the outdoor unit and clean up the inside of the compressor unit and the outdoor PCB mainboards. Check for loose wiring jacks, burnt terminals, and a corroded outdoor thermistor (this is the blue wire attached to a copper sensor head). After you’ve completed troubleshooting the outdoor unit, plug the aircon back in and check the display. If the error code is still showing, then you might want to call in expert help.
Clearing the persistent CH21 error from your LG air conditioning system might entail replacement of defective parts. Silverback Aircon has refurbished LG spare parts on hand, and the table below lists the estimated price of each part that might be the cause of the CH21 error.
The following table details aircon servicing through Silverback Aircon, which might also be needed to fully resolve the CH21 error on your LG air conditioning unit. Silverback Aircon’s full aircon servicing job includes cleaning of the AC cover, washing of the aircon filter, clearing of any drainage pan choke, vacuum cleaning of the evaporator coil, and reinstallation of the aircon’s back cover. There is also a gas leak check involved, whenever applicable
For a completely error-free LG air conditioning unit, you can also opt for a regular aircon maintenance appointment with Silverback Aircon technicians. The following table shows the annual pricing costs for quarterly aircon servicing. A quarterly contract maintenance schedule is a cost-effective solution to recurring aircon problems. It also makes your life easier. You will no longer have to deal with aircon maintenance tasks that might disrupt your busy day-to-day schedule.
Take advantage of the free expert consultation offered by Silverback Aircon through Whatsapp. We can help you clear the CH21 error, as well as other LG aircon error codes, and provide a quote for the repair and parts replacement costs involved. Talk to us today.
