Samsung Air Conditioner Error Code G3

G3 indicates a breakaway condition of the COND MID sensor in the outdoor unit. This means the sensor has disconnected or lost signal, preventing the system from monitoring condenser midpoint temperature. The unit may shut down or restrict operation until the fault is resolved.

Operating the system with a G3 fault is not recommended. The COND MID sensor provides critical thermal data for the condenser coil, and running without it means the control board cannot properly monitor heat levels. This could lead to compressor stress or further component damage over time.

A reset may temporarily clear the G3 code, but if the underlying sensor disconnection or fault has not been corrected, the error will return once the system attempts to read the sensor again. The root cause must be addressed by inspecting and reseating or replacing the COND MID sensor before the error will stay cleared.

If the sensor has simply come loose from its mounting clip or the wiring connector is unplugged, reseating it is a straightforward fix that a knowledgeable DIYer can perform. However, working inside the outdoor unit involves electrical components, so the unit should be powered off at the breaker before inspection. If the sensor or wiring is damaged, replacement is needed and a technician may be advisable.

If only the sensor needs to be reseated, the repair may cost nothing beyond a service call fee, which typically ranges from $50 to $100. If the COND MID sensor itself requires replacement, parts and labor costs generally range from $75 to $250 depending on the model and local labor rates. Control board replacement, if needed, will cost significantly more.