Samsung Air Conditioner Error Code E323

E323 indicates a short circuit or open circuit fault on suction sensor 2, a temperature sensor that monitors the refrigerant suction line. The PCB detected a resistance reading outside the acceptable range, which prevents it from obtaining valid temperature data. The system may shut down or restrict operation to protect the compressor until the fault is resolved.

Operating the unit while E323 is active is not recommended. Suction sensor 2 provides temperature data the PCB uses to protect the compressor from overheating or refrigerant flooding. Running the system without reliable sensor input risks compressor damage, which is a significantly more expensive repair than addressing the sensor fault.

A power reset may temporarily clear the E323 code, but if the underlying sensor circuit fault still exists, the error will return once the unit restarts and attempts to read suction sensor 2. A reset alone is not a fix. The sensor connector, wiring, and sensor element must be inspected and tested to permanently resolve the fault.

Some causes of E323 are accessible to a knowledgeable DIYer, such as reseating a loose connector at the PCB or inspecting visible wiring for damage. However, working near refrigerant lines, testing sensor resistance accurately, or replacing PCB components typically requires technical experience. If basic connector checks do not resolve the fault, a qualified technician should perform further diagnostics.

Repair costs vary depending on the root cause. A simple connector reseating involves no parts cost and minimal labor time. Replacing a faulty suction sensor typically falls in the range of $50 to $150 for parts and labor. If the PCB requires replacement, costs can range from $200 to $600 or more depending on the unit model and service rates in your area.