Mitsubishi Mini Split Error Code UP: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
UP
Brand
Mitsubishi
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code UP on your Mitsubishi mini split indicates the compressor is drawing too much current, which can be caused by electrical issues, a faulty capacitor, or a locked rotor. This error is serious enough to stop operation, but many causes can be fixed at home without a technician.
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Tools You'll Need

How to Fix Error Code UP

  1. Turn Off Power and Wait

    Always disconnect power before servicing the unit to avoid electric shock.

  2. Inspect and Clean Outdoor Unit

  3. Check Electrical Connections

    Even with power off, the capacitor can hold dangerous voltage. Discharge it safely before touching.

  4. Test the Run Capacitor

    Discharge the capacitor with a 10kΩ resistor before testing to avoid electric shock.

  5. Measure Compressor Resistance

  6. Check Refrigerant Pressure

    Refrigerant handling requires EPA certification; do not attempt without proper training.

Parts You May Need

Run capacitor
Check Price on Amazon
Run capacitor
Check Price on Amazon
Run capacitor
Check Price on Amazon
Run capacitor
Check Price on Amazon
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When to Call a Professional

If all steps check out but the error persists, the compressor may be seized or the control board faulty. Also call a technician if you are not comfortable working with high voltage or refrigerant.

Frequently Asked Questions

Can I reset a Mitsubishi mini split error code UP?
Yes, turn off the unit at the breaker for 30 minutes, then turn it back on. If the error was temporary, it should clear. If it returns, a real issue exists.
How much does it cost to fix a Mitsubishi mini split UP error?
If you replace the capacitor yourself (part cost ~$15-30), it's cheap. Professional repair can cost $200-$800 depending on the cause.
Is error code UP serious?
Yes, it indicates an electrical or mechanical problem that can damage the compressor if ignored. Address it promptly.

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