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Mitsubishi Electric Air Conditioner U6 / UP / UF Error Code

Compressor overcurrent. What it means, which models show it, and how to clear it, easiest fix first.

Mitsubishi ElectricAll Mitsubishi Electric air conditioner codes

U6 / UP / UF
May need a pro

The outdoor unit cut power to the compressor because it drew too much current. UF means the compressor appears locked at start-up; U6 can also indicate a problem with the inverter's power module.

Compatible models

Mitsubishi Electric doesn't publish a model list for this code; it appears on Mitsubishi Electric air conditioners with a digital display. Check your owner's manual.

Also shown as

These codes appear on outdoor units used with Mr. Slim and P-series systems; exact meanings vary by series, so check your manual.

Difficulty

Try the basic checks, but the usual fix is a technician's job.

Safety first: unplug the air conditioner (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix Mitsubishi Electric U6 / UP / UF

  1. Reset the power at the breaker

    Switch off the breaker that feeds the air conditioner (some systems have separate breakers for the indoor and outdoor units, so switch off both). Wait about five minutes, switch the power back on and restart the unit to see if the code clears.

  2. Don't keep restarting it

    If the code returns quickly, leave the system off. Repeated restarts against a locked or faulty compressor can cause more damage.

When to call a technician

Compressor and inverter faults involve high-voltage parts in the outdoor unit, so book a technician.

Parts linked to U6 / UP / UF

These are the parts most often behind this code. Tap one to see what it does and the signs it is failing.

Order parts by your full model number so they fit.

Frequently asked questions

What does U6 / UP / UF mean on a Mitsubishi Electric air conditioner?

The outdoor unit cut power to the compressor because it drew too much current. UF means the compressor appears locked at start-up; U6 can also indicate a problem with the inverter's power module.

Which Mitsubishi Electric models show the U6 / UP / UF code?

Mitsubishi Electric doesn't publish a model list for this code; it appears on Mitsubishi Electric air conditioners with a digital display. Check your owner's manual.

Can I fix Mitsubishi Electric U6 / UP / UF myself?

Only the basic checks. You can safely try the steps above, but U6 / UP / UF usually points to a part or fault that needs a technician.

What if U6 / UP / UF keeps coming back?

A code that returns after a reset and the checks above usually means a part is wearing out. Note when U6 / UP / UF appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.

Other Mitsubishi Electric air conditioner codes

Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.

Sources we checked