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Error code reference

LG Heat Pump Error Code E223

COND-OUT MAIN temperature sensor error OPEN/SHORT.

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What the E223 error code actually means

Your LG heat pump has detected a problem with a temperature sensor located at the condenser outlet, which is the part of the system that releases or absorbs heat depending on the operating mode. The system is reading either no signal or a faulty signal from this sensor, so it has stopped operating normally to protect itself. A technician will need to inspect the sensor wiring and test the sensor itself to resolve this issue.

Diagnostic procedure

The full E223 procedure

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1
First diagnostic step
Check if sensor connector is separated from PCB; measure resistance and compare to table.
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Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Most common causes of E223

Ranked by how often they cause this code
  1. 1Disconnected sensor connector
  2. 2Failed thermistor (OPEN or SHORT)
  3. 3Damaged or broken sensor wiring harness
  4. 4Corroded or moisture-damaged connector
  5. 5Faulty main PCB

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Questions people ask about E223

What does E223 mean on a LG heat_pump?
E223 indicates a condenser outlet main temperature sensor error, specifically an OPEN or SHORT circuit condition detected by the main PCB. The sensor monitors refrigerant temperature at the condenser outlet and is essential for system control. When the PCB reads a signal outside the valid resistance range, it triggers E223 and limits or stops operation to protect the system.
Is it safe to keep running my LG heat pump with an E223 error?
It is not recommended to continue operating the unit while E223 is active. The condenser outlet temperature sensor plays a key role in protecting the system from unsafe operating conditions. Running the unit without accurate sensor data could lead to further component damage or reduced system reliability.
Will resetting my LG heat pump clear the E223 error code?
A power reset may temporarily clear the E223 code, but if the underlying sensor fault (disconnected connector, failed thermistor, or damaged wiring) has not been corrected, the error will return once the system attempts to read the sensor again. A reset should only be performed after the root cause has been identified and addressed.
Can I fix E223 on my LG heat pump myself?
A homeowner comfortable with basic electrical checks can inspect the sensor connector at the PCB to ensure it is fully seated and free of corrosion. However, measuring sensor resistance and comparing it to the technical reference table, or replacing the sensor and PCB components, typically requires a qualified technician with the proper tools and access to service data.
How much does it cost to repair an E223 error on an LG heat pump?
Repair costs vary depending on the root cause. If only the sensor connector needs reseating, the cost may be limited to a service call fee, typically in the range of $75 to $150. Sensor replacement parts and labor can add $100 to $300 or more, and PCB replacement, if required, can bring total costs to $300 to $700 or higher depending on the unit and region.

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