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Mitsubishi Electric Air Conditioner PA Error Code

Shut down to prevent a water leak. What it means, which models show it, and how to clear it, easiest fix first.

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PA
Moderate DIY

The system has forced the compressor to stop because the indoor unit detected a water-leak condition. On units with a built-in drain pump, that points to the condensate drain system.

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 check codes appear on wired wall controllers, mainly with P-series, Mr. Slim and ducted or ceiling units; wall-mounted M-series units (MSZ) usually report faults by blinking the OPERATION light instead. The meanings here come from Mitsubishi Electric's Mr. Slim code list for Singapore models, and they can differ by series and region, so check your manual. PA is listed in the Singapore Mr. Slim code list but not in the North American controller manual.

Difficulty

Start with the safe checks below; a worn part may need replacing.

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 PA

  1. Switch off and look for water

    Switch off the breaker and check under the indoor unit for dripping or wet ceiling tiles. Keep clear of any wet electrical fittings.

  2. Clear the drain line outlet

    Clear any blockage you can reach at the open end of the condensate line outdoors or at the floor drain.

  3. 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.

When to call a technician

If PA returns or there's visible water damage, have a technician clear the internal drain and check the pump.

Parts linked to PA

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 PA mean on a Mitsubishi Electric air conditioner?

The system has forced the compressor to stop because the indoor unit detected a water-leak condition. On units with a built-in drain pump, that points to the condensate drain system.

Which Mitsubishi Electric models show the PA 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 PA myself?

Often. The first steps above are safe checks a homeowner can do. If they don't clear PA, the cause is likely a worn part that needs replacing.

What if PA keeps coming back?

A code that returns after a reset and the checks above usually means a part is wearing out. Note when PA 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