Mitsubishi Mini-Split Error Code UH: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
UH
Brand
Mitsubishi
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code UH on your Mitsubishi mini-split indicates the current sensor is saturated, meaning the sensor detecting electrical current is overloaded or faulty. This can prevent your system from operating correctly. The fix typically involves checking wiring, resetting the system, or replacing the current sensor.
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Tools You'll Need

How to Fix Error Code UH

  1. Safety First: Power Off the System

    Always disconnect power before working on the unit to avoid electric shock.

  2. Check for Loose or Damaged Wiring

  3. Reset the System

  4. Test the Current Sensor

    Only test components with power off.

  5. Replace the Current Sensor

  6. Check the Main Control Board

    Working with control boards carries risk of damage; consider calling a technician.

Parts You May Need

Current sensor (toroidal coil)
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Main control board
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Current sensor (toroidal coil)
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Main control board
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Current sensor (toroidal coil)
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Main control board
Check Price on Amazon
Current sensor (toroidal coil)
Check Price on Amazon
Main control board
Check Price on Amazon
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When to Call a Professional

If you are uncomfortable working with electrical components, or if replacing the current sensor and resetting the system do not clear the error, contact an HVAC technician. A faulty main control board usually requires professional diagnosis and replacement.

Frequently Asked Questions

What does error code UH mean on a Mitsubishi mini-split?
Error code UH indicates a current sensor saturation fault. The sensor that monitors electrical current is detecting an overload or has failed.
Can I fix Mitsubishi mini-split error UH myself?
Yes, if you have basic electrical knowledge. You can check wiring and test/replace the current sensor. If the issue is the control board, professional help is recommended.
How do I reset a Mitsubishi mini-split after error UH?
Turn off the unit and circuit breaker for 10 minutes, then power back on. This may clear temporary glitches.
What causes current sensor saturation in a mini-split?
Common causes include a faulty current sensor, loose wiring, or a failing compressor drawing excessive current.
How much does it cost to fix error UH on a Mitsubishi mini-split?
DIY sensor replacement costs $20-$50 for the part. Professional repair may range from $100-$300, depending on labor and if the control board needs replacing.

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