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Error code reference

LG Air Conditioner Error Code 219

HR unit 5 sub-cooling discharge pipe temperature sensor error (open or short).

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What the 219 error code actually means

Your LG heat recovery air conditioning system has detected a problem with a small temperature sensor located on one of its internal refrigerant pipes. The sensor is either disconnected, has a broken wire, or has failed internally, so the system cannot read the pipe temperature and has stopped normal operation to protect itself. A technician will need to inspect the wiring and sensor to identify and correct the fault.

Diagnostic procedure

The full 219 procedure

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First diagnostic step
Check connection condition of temperature sensor and lead cable.
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Most common causes of 219

Ranked by how often they cause this code
  1. 1Loose or disconnected sensor connector
  2. 2Damaged or broken lead cable
  3. 3Failed thermistor sensor element
  4. 4Corroded or contaminated connector pins
  5. 5Control board input circuit fault

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Questions people ask about 219

What does 219 mean on a LG air_conditioner?
Error code 219 on an LG air conditioner indicates a fault with the HR unit 5 sub-cooling discharge pipe temperature sensor. The controller has detected either an open circuit or a short circuit in the sensor or its lead cable. The system cannot reliably monitor pipe temperature and will restrict or halt operation until the fault is resolved.
Is it safe to keep running my LG air conditioner with error code 219 active?
Running the system with an active 219 fault is not recommended. The sub-cooling discharge pipe sensor provides data the controller uses to manage refrigerant conditions in the HR unit, and operating without accurate sensor feedback can lead to inefficient performance or component damage. The system may already be limiting operation automatically as a protective measure.
How much does it cost to repair error code 219 on an LG air conditioner?
If only the sensor connector or lead cable needs reseating or replacement, repair costs are generally in the lower range, roughly $75 to $200 including labor. If the thermistor sensor element needs replacement the cost typically falls between $150 and $350 depending on parts availability and labor rates. A control board replacement, if required, can push costs significantly higher, often $400 to $800 or more.
Can I fix error code 219 myself?
A knowledgeable DIYer can check the sensor connector and lead cable for visible damage or loose connections, which are the most common causes. However, testing sensor resistance accurately and diagnosing the control board require a multimeter and some familiarity with thermistor behavior. Any work involving the refrigerant circuit or internal HR unit components should be handled by a certified technician.
Will resetting the unit clear error code 219?
A power reset may temporarily clear the displayed error, but if the underlying sensor fault still exists, the code will return once the controller performs its diagnostic checks. The physical cause of the open or short circuit must be identified and corrected before the error will stay cleared.

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