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Error code reference

LG Heat Pump Error Code E263

Discharge temperature sensor breakaway

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What the E263 error code actually means

Your LG heat pump has detected that the two temperature sensors on the second compressor are reading very different temperatures from each other, which usually means one sensor has come loose from where it is attached. The system flagged this because a 40-degree or greater difference between the sensors is not normal and could indicate a problem that might damage the compressor. A technician will need to inspect and reattach or replace the sensor to clear this error.

Diagnostic procedure

The full E263 procedure

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1
First diagnostic step
Check if corresponding compressor sensor is separated; reassemble.
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Most common causes of E263

Ranked by how often they cause this code
  1. 1Sensor physically separated from compressor
  2. 2Damaged or broken sensor clip or bracket
  3. 3Faulty digital discharge temperature sensor
  4. 4Wiring harness damage or loose connector
  5. 5Faulty fixed discharge temperature sensor

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Questions people ask about E263

What does E263 mean on a LG heat_pump?
E263 means the LG heat pump has detected a difference of more than 40 degrees Celsius between the digital discharge temperature sensor and the fixed discharge temperature sensor on compressor 2. This comparison is part of a built-in safety check to catch sensor failures or physical separation before compressor damage can occur. The error points specifically to the second compressor's discharge temperature monitoring circuit.
Is it safe to run my LG heat pump while error E263 is active?
Operating the heat pump with E263 active is not recommended. The error exists to protect compressor 2 from damage caused by undetected overheating or sensor failure. Continuing to run the system without addressing the fault could lead to compressor damage that is significantly more costly to repair than the sensor issue itself.
How much does it cost to repair error E263 on an LG heat pump?
If the repair is simply reseating a separated sensor, the cost is primarily a service call fee, which typically ranges from $75 to $150 depending on your area. If the discharge temperature sensor itself needs replacement, parts and labor combined can range from $150 to $400 or more depending on parts availability and the time required to access the compressor discharge area. Compressor-related work generally requires a licensed HVAC technician.
How do I fix error code E263 on my LG heat pump?
Start by powering down the unit and inspecting the discharge temperature sensor on compressor 2 to see if it has separated from its mounting point. If the sensor is loose, reseat and secure it firmly against the discharge line or compressor surface. If the sensor is properly mounted and the error persists, test the sensor wiring and connectors for damage, and consider replacing the sensor if it shows signs of electrical failure.
Will resetting my LG heat pump clear error E263?
A reset may temporarily clear the error code, but it will return if the underlying sensor issue has not been resolved. The system will detect the same greater-than-40-degree temperature difference as soon as it resumes normal operation and comparison checks. The sensor must be physically inspected, reseated, or replaced to achieve a lasting fix.

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