Mitsubishi Air Conditioner Error PB

⚡ Quick Answer: The Mitsubishi Air Conditioner error code PB indicates a fault with the indoor fan motor. This may result from motor failure, wiring issues, or contro... ⚠️ Difficulty Varies

What Does Error PB Mean?

The Mitsubishi Air Conditioner error code PB indicates a fault with the indoor fan motor. This may result from motor failure, wiring issues, or control board malfunctions. Symptoms include the indoor fan not starting, intermittent fan operation, and the unit shutting down while displaying the PB code. It's essential to address this issue promptly to restore normal operation.

Common Symptoms:

  • Indoor fan does not start
  • Fan stops intermittently during operation
  • Unit may shut down and show PB code on display or remote controller

Possible Causes

  • Indoor fan motor winding failure or mechanical failure (high)
  • Fan motor connector or wiring issue (medium)
  • Indoor unit control board fault affecting fan motor control (medium)

How to Fix Error PB

DIY Fix Basic checks for PB error

  1. Turn off power and restart unit to confirm persistent PB code
  2. Check for any obvious obstructions preventing fan blade movement
  3. Ensure remote/controller displays code consistently and unit actually won’t run fan

Technician Only Technician-level diagnosis for PB error

  1. Disconnect power and inspect indoor fan motor windings for continuity and insulation resistance
  2. Check fan motor connector and wiring harness for corrosion, loose connection or damage
  3. Test or replace indoor fan motor if windings or bearings show failure
  4. Verify indoor unit control board outputs to fan motor and replace control board if needed

Parts needed: Indoor fan motor, Fan motor wiring harness/connectors, Indoor unit control board

🛑 When to Call a Pro:
  • If the PB code persists after basic checks
  • If fan motor windings or wiring cannot be safely tested by user
  • If internal control board faults are suspected

Technical Specifications

wattage 1200W
component Compressor
resistance 3-6 ohms
part_number Mitsubishi 5R00A00001
voltage_rating 230V AC

Common Questions

What does PB error mean on Mitsubishi Air Conditioner?

The PB error indicates a fault with the indoor fan motor, possibly due to motor failure, wiring issues, or control board malfunctions.

Can I fix Mitsubishi Air Conditioner PB error myself?

Yes, you can perform basic checks like restarting the unit and checking for obstructions. However, complex issues may require a technician.

How much does it cost to fix PB error?

Repair costs for the PB error typically range from $150 to $600+, depending on the parts needed and labor.

When should I call a technician for PB?

Call a technician if the PB code persists after basic checks, or if there are issues with the fan motor or control board that you cannot safely diagnose.

Sources & References

Data last verified: 2026-07-01

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