Mitsubishi Air Conditioner Error PF

⚡ Quick Answer: The Mitsubishi Air Conditioner PF error code indicates a power failure related to the automatic filter cleaning system. This can occur due to abnormal... ✅ DIY Fixable

What Does Error PF Mean?

The Mitsubishi Air Conditioner PF error code indicates a power failure related to the automatic filter cleaning system. This can occur due to abnormal position detection of the filter cleaner, a detached or improperly installed dust box, or issues with the limit switch or connectors. Symptoms include the PF code on the display, incomplete cleaning cycles, and a dislodged dust box. It's crucial to perform basic checks to resolve the issue before seeking professional assistance.

Common Symptoms:

  • Unit displays PF on controller or onboard display
  • Automatic filter cleaning mechanism does not complete cycle or is stopped
  • Dust box appears dislodged or not detected

Possible Causes

  • Filter auto‑clean position detection abnormal (medium)
  • Filter auto‑clean dust box detached or not properly installed (medium)
  • Limit switch or connector related to filter auto‑clean mechanism disconnected or faulty (low)

How to Fix Error PF

DIY Fix Basic filter auto‑clean system checks

  1. Turn off and isolate power to the air conditioner
  2. Visually inspect the filter auto‑clean unit and dust box to ensure they are properly seated and latched
  3. Confirm no obvious obstructions in the filter cleaning path
  4. Power the unit back on to see if PF clears

Technician Only Service inspection of filter auto‑clean components

  1. Disconnect unit power and remove access panels per service manual
  2. Inspect the auto‑clean motor and position sensor for proper operation
  3. Check wiring and connectors leading to the limit switch for continuity and secure connections
  4. Replace any worn or failed sensors, connectors, or motor components as needed

Parts needed: Filter auto‑clean motor, Position sensor/limit switch, Connectors and wiring harness for auto‑clean system

🛑 When to Call a Pro:
  • If the PF code persists after basic user‑level checks
  • If there is damage to the auto‑clean motor, sensor, or wiring that cannot be visually resolved

Technical Specifications

wattage 1500W
component Control Board
resistance 5-10 ohms
part_number Mitsubishi 5B-3D1
voltage_rating 230V AC

Common Questions

What does PF error mean on Mitsubishi Air Conditioner?

PF error indicates a power failure related to the automatic filter cleaning system, often showing as an unresponsive display.

Can I fix Mitsubishi Air Conditioner PF error myself?

Yes, you can perform basic checks like ensuring the filter auto-clean unit and dust box are properly seated and free of obstructions.

How much does it cost to fix PF error?

The estimated repair cost for the PF error ranges from $80 to $250, depending on parts and labor.

When should I call a technician for PF?

Call a technician if the PF code persists after user-level checks or if there is visible damage to components.

Data last verified: 2026-07-01

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