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P5

LCD shows P5 - Drain overflow protection is working

MHI · Air Conditioning

What does P5 mean?

The remote controller LCD displays 'P5', indicating that the drain overflow protection mechanism has been activated.

Common Causes

  • Drain pan overflow.
  • Clogged drain line.
  • Faulty float switch or drain pump.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the drain pan and lines for any blockages or water overflow.

  2. 2

    Clean the drain pan and ensure the drain lines are free of debris.

  3. 3

    Verify that the drain pump (if applicable) is operating correctly to remove condensate.

Browse all codes in this manual (124)
Verified technical data. Last updated: April 2026

Related Faults

00Outdoor Board LED only green lights up after startup - No outdoor unit of address 0 / Remote controller transmission wire open1OPERATION INDICATOR lamp blinks 1 time (Pattern A) - Indoor/outdoor unit communication error (Transmitting error - Outdoor unit)14OPERATION INDICATOR lamp blinks 14 times (Pattern A) - Other errors
Source: MHI Air Conditioning
Open Manual (Page 18)Search more codes in this manual