LG Heat Pump Error Code E234

E234 indicates a discharge temperature sensor error on fixed capacity compressor 3. The system has detected that the sensor circuit voltage is either above 4.95 volts (corresponding to an open circuit reading of approximately -30 degrees Celsius) or below 0.5 volts (corresponding to a short circuit reading of approximately 151 degrees Celsius). This fault is only detected when outdoor temperatures are above -10 degrees Celsius.

It is not advisable to continue operating the unit with this error active. The discharge temperature sensor protects compressor 3 from overheating, and if the sensor data is unavailable or invalid, the system cannot properly protect that compressor. Continued operation risks compressor damage, which is a significantly more expensive repair than fixing the sensor itself.

Repair costs depend on what has failed. If the fix is simply reseating a loose connector, labor costs alone may apply, typically in the range of $75 to $150 for a service call. Replacing the discharge temperature sensor generally costs between $150 and $350 including parts and labor. If the outdoor control board requires replacement, costs can range from $400 to $900 or more depending on the specific model and labor rates in your area.

A knowledgeable DIYer can check the sensor connector for looseness or visible damage, but accurately diagnosing this fault requires measuring sensor resistance and comparing it to a reference table, as well as testing wiring continuity. Replacing the discharge sensor or control board also requires safely handling refrigerant-side components, so a licensed HVAC technician is recommended for anything beyond connector inspection.

A power reset may temporarily clear the error code, but if the underlying sensor, wiring, or connector fault still exists, the code will return once the system resumes operation and outdoor temperatures are above -10 degrees Celsius. The root cause must be identified and corrected for the error to stay cleared.