What does error code U8 mean on a Mitsubishi Electric mini-split?

Outdoor fan protection stop. The outdoor unit fan protection stopped the unit.

Can I fix Mitsubishi Electric code U8 myself?

Start with these safe checks: Turn the system off at the breaker and check that the outdoor fan isn't blocked by snow, ice or debris. Don't reach into the fan. If U8 returns, call an HVAC technician.

When should I call a technician for code U8?

If U8 returns, call an HVAC technician. Don't open the sealed refrigerant system, cut or braze lines, or add refrigerant. That needs an EPA-certified technician. Turn power off at the breaker or disconnect before opening any panel, and leave capacitors, compressors and control boards to a pro: they can hold a dangerous charge even with the power off.

Mitsubishi Electric Mini-Split Error Code U8 / 8 blinks outdoor:…

What U8 means

The outdoor unit fan protection stopped the unit.

Also shown as: 8 blinks outdoor, depending on the model.

Likely causes

Outdoor fan blocked by ice, snow or debris
Fan motor fault

Safe first checks

Turn the system off at the breaker and check that the outdoor fan isn't blocked by snow, ice or debris. Don't reach into the fan.

When to stop

If U8 returns, call an HVAC technician.

Checked against: Mitsubishi Electric, Mr. Slim indoor/outdoor unit malfunction-diagnosis check codes (2024-11-18). Codes can differ by model and year, so confirm with your owner's manual.