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Error code reference

Samsung Air Conditioner Error Code E222

Outdoor COND-OUT temperature sensor open/short error.

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Outdoor COND-OUT temperature sensor open/short error.

First step from the service manual

Check if the outdoor COND OUT sensor connector is separated from PCB; if so, reconnect and restart.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E222 means on a Samsung air conditioner

Error code E222 on a Samsung air conditioner indicates an open or short circuit fault in the outdoor condenser outlet (COND-OUT) temperature sensor. This sensor is a thermistor mounted on the refrigerant line at the outlet of the outdoor condenser coil. It provides real-time temperature data to the outdoor unit PCB, which uses that reading to monitor refrigerant subcooling, protect the compressor, and regulate system operation. When the PCB detects a resistance value outside the expected range for the thermistor, it registers either an open circuit (resistance too high, indicating a broken wire or failed sensor) or a short circuit (resistance too low, indicating a wiring fault or shorted sensor).

The most immediate thing to check is whether the COND-OUT sensor connector has simply become disconnected from the outdoor PCB. Vibration during operation, improper handling during service, or loose factory connections can all cause the connector to separate, which presents to the PCB as an open circuit. Reconnecting the plug and restarting the unit will clear the fault if this is the cause.

If the connector is seated correctly and the error persists, the thermistor itself or its wiring harness is likely faulty. A failed thermistor will show resistance outside the normal operating range when measured with a multimeter. Wiring damage from rodents, UV degradation, or pinching during installation can also create intermittent open or short conditions along the sensor circuit. The outdoor PCB itself can be the source if it fails to correctly read a known-good sensor.

Source: manufacturer service documentation.

Common causes of E222

  1. 01

    Disconnected sensor connector

    Wiring / connection

    The COND-OUT sensor plug may have come loose from the outdoor PCB due to vibration or a previous service visit. Inspect the connector at the board and press it firmly back into place before restarting.

  2. 02

    Failed COND-OUT thermistor

    Part replacement

    The thermistor itself can fail open or short internally, producing a resistance reading outside the PCB's acceptable range. Testing the sensor with a multimeter and comparing to the expected resistance curve will confirm this failure.

  3. 03

    Damaged sensor wiring harness

    Part replacement

    The wiring between the thermistor and the PCB can be cut, pinched, or degraded by UV exposure, pests, or improper routing. Visually inspect the full length of the harness for breaks, fraying, or burn marks.

  4. 04

    Corroded or contaminated connector

    Wiring / connection

    Moisture intrusion into the outdoor unit can cause the sensor connector pins to corrode, increasing resistance in the circuit enough to trigger an open circuit fault. Inspect the connector for green or white oxidation on the terminals.

  5. 05

    Faulty outdoor PCB

    Part replacement

    If the thermistor and wiring both test within spec, the outdoor control board may have failed and is unable to correctly interpret the sensor signal. This is the least common cause and should be diagnosed after ruling out all sensor and wiring issues.

See the test procedure for each cause

Frequently asked questions about E222

What does E222 mean on a Samsung air conditioner?
E222 indicates an open or short circuit fault detected in the outdoor condenser outlet temperature sensor, also called the COND-OUT sensor. This thermistor sits on the refrigerant line leaving the outdoor condenser coil and feeds temperature data to the outdoor PCB. The error triggers when the PCB reads a resistance value that is too high (open) or too low (short) to be a valid sensor reading. The unit will not operate normally until the fault is resolved.
Can I fix E222 myself or do I need a technician?
The first diagnostic step, checking whether the sensor connector has separated from the outdoor PCB and reconnecting it, is something a careful homeowner can attempt after shutting off power to the unit. If reconnecting the plug does not clear the error, diagnosing the thermistor resistance, inspecting wiring, or replacing the PCB requires multimeter skills and refrigeration knowledge, so a qualified technician is recommended for those steps.
Is it safe to keep running my air conditioner with an E222 error?
No. The COND-OUT sensor provides temperature data the system uses to protect the compressor and manage refrigerant flow. Running the unit without a functioning sensor risks compressor damage or abnormal system pressures. The system should remain off until the fault is diagnosed and repaired.
Will resetting my Samsung air conditioner clear the E222 error?
A reset will clear the displayed code temporarily, but if the underlying sensor fault still exists the error will return once the unit attempts to operate. The only way to permanently clear E222 is to correct the root cause, whether that is reconnecting a loose plug, replacing a failed thermistor, or repairing damaged wiring.
How much does it cost to repair a Samsung air conditioner E222 error?
If the sensor connector was simply unplugged, the repair cost is just the service call fee, typically in the range of $75 to $150. Replacing a faulty COND-OUT thermistor usually costs between $100 and $250 including parts and labor. If the outdoor PCB needs replacement, costs can range from $300 to $600 or more depending on the unit model and labor rates in your area.

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