LG Air Conditioner Error Code 194

Error code 194 on an LG air conditioner indicates a heatsink temperature sensor abnormality on the fan PCB. The system has detected either an open circuit or a short circuit in the sensor used to monitor the fan board heatsink temperature. This causes the unit to restrict or stop operation to protect internal components. The fault must be diagnosed and corrected before normal operation can resume.

Running the unit while error 194 is active is not recommended. The heatsink temperature sensor protects the fan PCB from thermal damage, and without a valid sensor reading, the control system cannot enforce this protection. Continued operation could lead to board overheating and more extensive damage. It is best to address the fault before resuming normal use.

A power reset may temporarily clear the error display, but the code will return if the underlying sensor fault has not been corrected. Error 194 is triggered by a measurable electrical condition, specifically an open or short circuit in the sensor circuit, so the problem must be physically resolved. Resetting without repair is not a solution and could delay necessary service.

Some causes of error 194 are accessible to a knowledgeable DIYer. Checking and reseating the sensor connector and inspecting the sensor wire for obvious damage can be done without specialized tools. Measuring sensor resistance with a multimeter requires basic electrical knowledge. However, replacing the fan PCB or sensor wiring involves working inside the unit and should be handled by a qualified technician if you are not comfortable with appliance repair.

Repair costs vary depending on the root cause. If only the sensor or connector needs attention, parts typically range from a modest amount up to around $30 to $80. If the fan PCB requires replacement, parts and labor combined can range from $150 to $400 or more depending on the model and service rates in your area. Getting a diagnostic assessment from a technician before committing to repairs is advisable.