Mitsubishi Air Conditioner Error P5

⚡ Quick Answer: The Mitsubishi Air Conditioner P5 error code indicates a communication failure between the indoor and outdoor units, often resulting in water leakage ... ✅ DIY Fixable

What Does Error P5 Mean?

The Mitsubishi Air Conditioner P5 error code indicates a communication failure between the indoor and outdoor units, often resulting in water leakage or pooling around the indoor unit. This issue may occur due to a malfunctioning drain pump, which can lead to the unit shutting down and displaying the P5 code. Ensuring proper drainage is crucial, as clogs or improper slopes can exacerbate the problem. Addressing this promptly is essential for restoring normal operation.

Common Symptoms:

  • Water leakage or pooling around indoor unit
  • Unit shuts down and displays P5 on controller
  • Drain pump runs but fails to clear condensate

Possible Causes

  • Drain pump malfunction (failure, lock, or overheat) (high)

How to Fix Error P5

DIY Fix Basic checks for P5 drain fault

  1. Turn off the air conditioner and disconnect power.
  2. Check area around indoor unit for visible water leaks.
  3. Ensure drain line is free of obvious obstructions and has correct slope.
  4. Inspect visible drain pump area for accumulated debris if accessible.

Technician Only Technician‑level diagnostics and repair

  1. Disconnect unit power and access indoor unit drain assembly.
  2. Verify drain pump operation and replace if confirmed faulty.
  3. Clear or replace blocked drain line; ensure proper slope.
  4. Clean or replace drain sensor / float switch if contaminated or non‑responsive.
  5. Check wiring/connectors to drain pump and sensor for continuity and secure connections.

Parts needed: Drain pump assembly, Drain line components, Drain sensor / float switch, Associated wiring harness

🛑 When to Call a Pro:
  • If water leakage persists after basic checks
  • If you cannot access internal drain components safely
  • If replacement parts or electrical issues are suspected

Technical Specifications

wattage N/A
component Control Board
resistance N/A
part_number Mitsubishi 5B-4B
voltage_rating 220V AC

Common Questions

What does P5 error mean on Mitsubishi Air Conditioner?

The P5 error indicates a communication failure between the indoor and outdoor units, often accompanied by water pooling.

Can I fix Mitsubishi Air Conditioner P5 error myself?

Yes, you can perform basic checks like ensuring the drain line is clear and inspecting for visible leaks.

How much does it cost to fix P5 error?

Repair costs for the P5 error range from ¥15,000 to ¥60,000+ depending on parts and labor.

When should I call a technician for P5?

Call a technician if water leakage persists, if you can't safely access internal components, or if you suspect electrical issues.

Sources & References

Data last verified: 2026-07-01

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