Daikin Mini Split Error Code HC: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
HC
Brand
Daikin
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code HC on a Daikin mini split indicates a fault with the outdoor unit's pipe temperature thermistor. This sensor monitors refrigerant pipe temperature and, when faulty, can cause the system to shut down or run inefficiently. The fix involves checking the thermistor wiring and replacing the sensor if necessary.
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Tools You'll Need

How to Fix Error Code HC

  1. Turn Off Power

    Always disconnect power before servicing to avoid electric shock or injury.

  2. Access the Outdoor Unit

  3. Locate the Pipe Thermistor

  4. Inspect Wiring and Connections

  5. Test the Thermistor Resistance

  6. Replace the Thermistor if Faulty

    Ensure the replacement thermistor is identical to the original for proper operation.

  7. Reassemble and Test

Parts You May Need

Outdoor pipe thermistor
Check Price on Amazon
Outdoor pipe thermistor
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Outdoor pipe thermistor
Check Price on Amazon
Outdoor pipe thermistor
Check Price on Amazon
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When to Call a Professional

If replacing the thermistor does not clear the error, the control board may be faulty, or the refrigerant charge could be low. Call a licensed HVAC technician for diagnosis and repair.

Frequently Asked Questions

What does error code HC mean on a Daikin mini split?
HC stands for outdoor pipe thermistor fault. The sensor measures the temperature of the refrigerant line and may have failed or lost connection.
Can I use my Daikin mini split with error HC?
It's not recommended. The system may shut down or operate inefficiently, potentially causing damage to the compressor.
How much does it cost to replace a Daikin thermistor?
A replacement thermistor typically costs $15-$50. Professional installation may add $100-$200 for labor.
Is the HC error related to a dirty filter?
No, HC is specific to the outdoor thermistor. However, dirty air filters can cause other issues, so check them periodically.
How do I test a Daikin outdoor pipe thermistor?
Use a multimeter to measure resistance across the thermistor leads. At 77°F, it should read between 5 kΩ and 10 kΩ. Compare with your model's specs.

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