LG Air Conditioner Error Code CH64

CH64 means the LG air conditioner's control board detected a momentary power interruption in the unit's electrical supply. The system logs this code as a protective measure to alert you that the power feeding the unit was briefly lost or experienced an abnormal condition. It does not necessarily mean the unit itself is damaged, but it does indicate a power supply issue worth investigating.

Start by checking whether the code coincides with a known power outage or storm. If no external event is obvious, inspect the electrical connections at the disconnect box and the unit's terminal block for looseness or corrosion. Confirm the dedicated circuit breaker is in good condition and that supply voltage is within the normal operating range. If the code persists after these checks, a licensed electrician or HVAC technician should perform a more thorough electrical inspection.

If the cause is simply a loose terminal connection, a service call to identify and correct it typically costs between $75 and $200 depending on your area. Breaker replacement can add another $50 to $150 in parts and labor. If the control board requires replacement, costs can range from $300 to $600 or more including parts and labor. Getting a professional diagnosis first helps avoid unnecessary part replacements.

Resetting the air conditioner by powering it off and back on will often clear a CH64 code if the power interruption was a one-time event. However, if the underlying cause, such as a loose connection or unstable supply voltage, is still present, the code is likely to return. A reset should be treated as a starting point, not a permanent fix.

A single CH64 event is generally not an immediate safety emergency, but repeated occurrences can indicate wiring problems that pose fire or equipment damage risks over time. Loose connections and overloaded circuits are serious electrical issues that should not be ignored. If the code appears frequently, stop using the unit until the power supply is inspected by a qualified technician.