LG Air Conditioner Error Code E308

E308 indicates an error on the suction temperature sensor circuit, meaning the control board has detected either a short circuit or an open circuit condition at the thermistor located on the refrigerant suction line. The system shuts down when this fault is active to protect the compressor from operating without accurate temperature feedback. A technician should inspect the sensor connector and measure the sensor resistance to identify the root cause.

You should not continue operating the unit while E308 is active. The suction temperature sensor provides data the system uses to protect the compressor, and running without a valid sensor signal risks compressor damage from improper operating conditions. The unit will typically lock out until the fault is resolved.

A power reset may temporarily clear the error display, but E308 will return if the underlying sensor fault is still present. If the connector was simply loose, reseating it before resetting may resolve the issue permanently. A persistent return of E308 after a reset confirms that a wiring or component repair is needed.

A knowledgeable DIYer can start by checking whether the sensor connector has pulled free from the PCB and reseating it, which requires no special tools. Measuring sensor resistance with a multimeter is also within reach for someone comfortable with basic electrical testing. However, if the thermistor or control board needs replacement, or if the refrigerant circuit must be accessed, a certified technician should handle the repair.

Repair costs vary depending on the failed component. A replacement suction temperature sensor typically falls in the range of $15 to $60 for the part alone. If the control PCB requires replacement, parts and labor combined can range from $200 to $500 or more depending on the unit model and local labor rates. A diagnostic visit to confirm the cause will usually add $75 to $150 before any parts are ordered.