Daikin Mini Split Error Code H5: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
H5
Brand
Daikin
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code H5 on a Daikin mini split indicates a fault with the compressor motor temperature sensor. This sensor monitors the temperature of the compressor to prevent overheating. When it malfunctions, the system shuts down as a safety measure. This guide will help you diagnose and fix the issue.
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Tools You'll Need

How to Fix Error Code H5

  1. Turn Off Power and Inspect Wiring

    Always disconnect power before opening the unit to avoid electrical shock.

  2. Check Sensor Resistance with a Multimeter

  3. Replace the Temperature Sensor if Defective

  4. Test the Main Control Board

    Working with circuit boards carries risk of electrostatic discharge. Use proper grounding.

Parts You May Need

Compressor temperature sensor (thermistor)
Check Price on Amazon
Compressor temperature sensor (thermistor)
Check Price on Amazon
Compressor temperature sensor (thermistor)
Check Price on Amazon
Compressor temperature sensor (thermistor)
Check Price on Amazon
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When to Call a Professional

If you are not comfortable working with high-voltage electricity or if the error code returns after replacing the sensor, call a licensed HVAC technician. Complex issues like control board failure require professional diagnosis.

Frequently Asked Questions

Can I run my Daikin mini split with error H5?
No. The system will not operate until the fault is resolved. Running it could damage the compressor.
What is the part number for the Daikin compressor temperature sensor?
Part numbers vary by model. Check your unit's service manual or contact Daikin support. Generic thermistors are often used, but it's best to get the exact OEM part.
How do I reset error code H5?
After fixing the issue, turn off the system at the breaker for 10 minutes, then turn it back on. If the problem is resolved, the error will clear.
Can a dirty outdoor unit cause error H5?
While not directly, a dirty condenser coil can cause the compressor to overheat, potentially triggering a sensor fault. Regular cleaning helps prevent issues.
Is error H5 common on Daikin mini splits?
Yes, it is a relatively common error, especially in older units or after a power surge. The sensor is a known failure point.

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