Mitsubishi Air Conditioner Error E5

⚡ Quick Answer: The Mitsubishi Air Conditioner E5 error code indicates a communication failure between the indoor and outdoor units, disrupting the system's ability t... ✅ DIY Fixable

What Does Error E5 Mean?

The Mitsubishi Air Conditioner E5 error code indicates a communication failure between the indoor and outdoor units, disrupting the system's ability to operate effectively. Symptoms include the E5 code displayed on the unit or remote, unresponsiveness to remote commands, and intermittent or no cooling. This error typically arises from abnormalities in communication transmission between the remote controller and the unit components, requiring attention to ensure proper functionality.

Common Symptoms:

  • E5 code displayed on unit or remote
  • Air conditioner unresponsive to remote commands
  • Intermittent or no cooling operation

Possible Causes

  • Remote controller communication/transmission abnormality (high)
  • Indoor–outdoor unit communication failure (medium)

How to Fix Error E5

DIY Fix Basic Communication Checks

  1. Turn off power to the air conditioner at the main switch or breaker.
  2. Wait 30–60 seconds and restore power to see if the code clears.
  3. Ensure the remote controller has functioning batteries and is within range.
  4. Check that the unit responds to other remote inputs (e.g., power, mode change).

Technician Only Inspect and Repair Communication Wiring/Components

  1. Inspect communication wiring between the indoor unit and outdoor unit for loose, damaged, or corroded connections.
  2. Verify correct wiring gauge and termination per Mitsubishi specifications.
  3. Test communication boards in indoor and outdoor units for fault indications.
  4. Replace defective communication boards or wiring harnesses as needed.

Parts needed: Communication wiring harness, Indoor unit communication board, Outdoor unit communication board

🛑 When to Call a Pro:
  • If error persists after basic user-level actions
  • If wiring appears damaged or inaccessible
  • If multiple communication codes appear or system does not respond to remote/function commands

Next step

Choose the next step for E5

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

Most relevant component to inspect

Wiring Harness

Connects controls, sensors, motors, and other electrical components inside the appliance.

Typical part-only price
$20 - $120
DIY difficulty
Medium
Estimated time
30-90 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Model number required

Model-compatible Air Conditioner parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

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Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Air Conditioner Fin Cleaner

For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.

View maintenance supply
Maintenance supply

Model-Compatible Washable AC Filter

A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.

Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.

Find one that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Technical Specifications

note The previous model-independent part specification was removed. Verify the full model number and diagnosis in the manufacturer's official parts catalog before ordering.
part_number None

Common Questions

What does E5 error mean on Mitsubishi Air Conditioner?

The E5 error means there's a communication failure between the indoor and outdoor units, indicated by the E5 code on the display.

Can I fix Mitsubishi Air Conditioner E5 error myself?

Yes, you can try basic communication checks like resetting power and ensuring the remote batteries are functional.

How much does it cost to fix E5 error?

Repair costs for the E5 error can range from ¥10,000 to ¥50,000+, depending on the parts and labor required.

When should I call a technician for E5?

Call a technician if the error persists after basic fixes, if wiring is damaged, or if multiple errors occur.

Sources & References

Data last verified: 2026-07-31

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