What does error code P2 mean on a Mitsubishi Electric mini-split?

Pipe sensor error. A pipe (coil) temperature sensor has an error (P2 for TH2, P9 for TH5).

Can I fix Mitsubishi Electric code P2 myself?

Start with these safe checks: Turn the system off at the breaker for a few minutes and back on. If it returns, call an HVAC technician.

When should I call a technician for code P2?

If it 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 P2 / P9 / 2 blinks: Pipe…

What P2 means

A pipe (coil) temperature sensor has an error (P2 for TH2, P9 for TH5).

Also shown as: P9, 2 blinks, depending on the model.

Likely causes

Sensor or connection fault

Safe first checks

Turn the system off at the breaker for a few minutes and back on.

When to stop

If it 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.