Samsung Air Conditioner Error Code YEL_FLICKER_RED_ON

This code indicates an OLP (Over Load Protector) sensor error, meaning the control board has detected either an open circuit or a short circuit at the OLP temperature sensor connected at CN52 pins 1 and 2. The OLP sensor monitors thermal conditions to protect the compressor. When the sensor signal is missing or out of range, the unit shuts down to prevent equipment damage.

A power reset may temporarily clear the fault display, but the error will return immediately if the underlying sensor or wiring problem has not been corrected. Because this is a hardware fault, not a transient communication glitch, the unit will detect the open or short condition again as soon as it attempts to read the OLP sensor signal. A reset is not a repair.

Repair costs depend on what component has failed. If the issue is only a loose or corroded connector at CN52, the cost may be limited to a service call fee, typically in the range of $75 to $150. A replacement OLP sensor generally adds $20 to $80 in parts. If the control board requires replacement, total repair costs including labor can range from $250 to $600 or more depending on the unit model and local labor rates.

A knowledgeable DIYer can inspect the wiring harness and reseat the connector at CN52 to rule out a loose connection, but testing the sensor's resistance and diagnosing a board fault requires a multimeter and familiarity with reading electrical schematics. If the sensor has failed or the wiring is damaged inside the unit, replacing those components is best handled by a qualified technician, especially since the fault involves compressor protection circuitry.

No. The OLP sensor is part of the compressor protection system, and operating the unit without a functioning sensor means the system has no thermal overload protection. Continued operation risks compressor damage, which is a significantly more expensive repair. The unit should remain off until the sensor fault is resolved.