Samsung Air Conditioner Error Code *5

The *5 error code on a Samsung wired remote controller system indicates an indoor unit pipe sensor error. The asterisk represents the address number of the specific indoor unit that is reporting the fault. The error means the control system is not receiving a valid signal from the pipe thermistor connected at the CN8 terminal on that indoor unit. Normal operation may be restricted until the fault is resolved.

It is not recommended to continue operating the system while the *5 error is active. The pipe thermistor plays a role in protecting the system from conditions like coil freezing and refrigerant-related damage. Running the unit without a functioning pipe sensor could allow unsafe operating conditions to go undetected, potentially causing additional component damage.

A power reset may temporarily clear the *5 error code from the display, but if the underlying cause such as a failed thermistor or disconnected CN8 connector has not been corrected, the code will return once the system powers back up and attempts to read the sensor. A reset alone is not a repair and should only be used after the root cause has been addressed.

Start by locating the affected indoor unit using the address number shown in place of the asterisk. Check that the pipe thermistor is properly plugged into the CN8 connector on the indoor unit control board. If the connection is secure, test the thermistor resistance with a multimeter to determine if the sensor has failed and needs replacement. Also inspect the wiring harness for any visible damage or corrosion.

Repair costs vary depending on what component has failed. If only the pipe thermistor needs replacement, parts and labor typically range from $75 to $200. If the indoor unit control board is the cause, costs can range from $200 to $600 or more depending on the model and labor rates in your area. A diagnostic visit to confirm the root cause is usually the first expense to expect.