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

Indoor fan motor error. The indoor unit's fan motor has an error.

Can I fix Mitsubishi Electric code PB myself?

Start with these safe checks: Turn the system off and check for anything visibly stuck in the indoor unit's air outlet, without reaching inside. Fan motor repair is for an HVAC technician.

When should I call a technician for code PB?

Fan motor repair is for 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 PB / Pb / 11 blinks:…

What PB means

The indoor unit's fan motor has an error.

Also shown as: Pb, 11 blinks, depending on the model.

Likely causes

Fan motor fault
Obstruction

Safe first checks

Turn the system off and check for anything visibly stuck in the indoor unit's air outlet, without reaching inside.

When to stop

Fan motor repair is for 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.