Mitsubishi Mini-Split Error Code U6: How to Fix It

Q: Can I reset Mitsubishi mini-split error code U6 myself?

Yes, you can reset the error by turning off the power at the breaker for 30 seconds. However, if the underlying issue (like a failing compressor) is not fixed, the code will return.

Q: Is error U6 serious?

Yes, U6 is a high-severity error indicating compressor overcurrent. Ignoring it can lead to compressor burnout or electrical fire. Address it promptly.

Q: What causes compressor overcurrent on a Mitsubishi mini-split?

Common causes include a faulty run capacitor, bad compressor windings, a seized compressor, loose wiring, or a failing contactor. Voltage issues can also contribute.

Q: How much does it cost to fix U6 error?

If you DIY and just need a capacitor, the cost is under $30. If the compressor needs replacement, expect $500-$1500 including labor.

Q: Can a dirty coil cause U6?

While not a direct cause, dirty coils can make the system work harder and draw more current, potentially triggering overcurrent if other components are borderline. Clean coils as part of maintenance.

Abstract

Error code U6 on a Mitsubishi mini-split indicates a compressor overcurrent fault. This means the electrical current drawn by the compressor is too high, which can be caused by a failing compressor, a locked rotor, or faulty electrical components. Immediate action is needed to prevent damage to the system.