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Error code reference

LG Heat Pump Error Code P717

Outdoor unit discharge temperature 2 protection control.

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What the P717 error code actually means

Your LG heat pump has detected that the temperature of the hot refrigerant gas leaving the compressor in the outdoor unit has gotten too high, so the system has shut down to protect itself from damage. This can happen because of low refrigerant, a dirty outdoor unit, or a faulty temperature sensor. A technician will need to inspect the system to find the root cause before the unit can run safely again.

Diagnostic procedure

The full P717 procedure

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1
Confirm the fault
Power cycle the unit: switch off the breaker for 60 seconds, then restore power. If the code returns, the fault is persistent and the procedure below isolates the cause.
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Most common causes of P717

Ranked by how often they cause this code
  1. 1Low refrigerant charge
  2. 2Blocked or dirty outdoor coil
  3. 3Faulty discharge temperature sensor (sensor 2)
  4. 4Outdoor fan motor failure or reduced airflow
  5. 5Compressor inefficiency or internal wear

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Questions people ask about P717

What does P717 mean on a LG heat_pump?
P717 is a protection code indicating that the second discharge temperature sensor on the outdoor unit has detected refrigerant discharge temperatures above the safe operating threshold. The system responds by limiting or shutting down operation to prevent compressor damage. Common causes include low refrigerant, a dirty outdoor coil, a failed outdoor fan, or a faulty sensor.
Is it safe to keep running my LG heat pump with a P717 error?
No, you should not attempt to force the unit to keep running while P717 is active. The protection code exists specifically to prevent compressor damage from overheating. Continuing to operate the system under these conditions risks destroying the compressor, which is the most expensive component in the system.
How much does it cost to repair a P717 error on an LG heat pump?
Repair costs vary widely depending on the cause. A coil cleaning or sensor replacement might run anywhere from $100 to $350, while a refrigerant recharge including leak diagnosis can range from $200 to $600 or more. If the compressor itself is damaged, replacement costs can range from $800 to $2,500 or higher depending on the system size and labor rates in your area.
Can I fix P717 on my LG heat pump myself?
Some basic checks, such as cleaning the outdoor coil and making sure nothing is blocking airflow around the unit, can be done by a homeowner. However, diagnosing refrigerant charge issues, testing thermistor resistance, and inspecting the compressor require specialized tools and EPA certification for refrigerant handling, so a licensed HVAC technician should handle the full repair.
Will resetting the unit clear the P717 error code?
A power reset may temporarily clear the code and allow the unit to restart, but if the underlying cause is not resolved, the code will return once the system reaches the same fault condition again. Repeated resets without addressing the root cause can shorten compressor life. A proper diagnosis should be performed before relying on a reset as a solution.

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