Mitsubishi Air Conditioner Error E8

⚡ Quick Answer: The Mitsubishi Air Conditioner E8 error code indicates a communication failure between the indoor and outdoor units, which can lead to system shutdown... ✅ DIY Fixable

What Does Error E8 Mean?

The Mitsubishi Air Conditioner E8 error code indicates a communication failure between the indoor and outdoor units, which can lead to system shutdowns or failure to start. This issue is typically caused by communication abnormalities or overcurrent protection triggers within the system. Ensuring proper connections and checking for damaged wiring can help resolve the issue.

Common Symptoms:

  • Unit displays E8 on the remote or indoor unit
  • System may shut down or fail to start
  • Indoor and outdoor units fail to communicate

Possible Causes

  • Indoor/outdoor communication fault (medium)
  • Overcurrent or protective trip (fan/compressor) (medium)

How to Fix Error E8

DIY Fix Check basic connections and filters

  1. Turn off the unit completely and disconnect from power
  2. Check that the communication cable between indoor and outdoor units is securely connected and undamaged
  3. Clean or replace air filters to ensure proper airflow

Technician Only Diagnose communication and overcurrent circuits

  1. Verify integrity of communication wiring (pinout, continuity, insulation)
  2. Inspect indoor and outdoor PCBs for fault indicators or failed components
  3. Measure current draw on fan and compressor circuits to detect overcurrent conditions
  4. Test or replace failing sensors or board components as needed

Parts needed: communication wiring harness, indoor/outdoor PCBs, fan motor or compressor as confirmed faulty

🛑 When to Call a Pro:
  • If communication wiring damage is suspected
  • If the error persists after cleaning filters and checking connections
  • If you lack tools or training to safely access internal wiring or PCBs

Technical Specifications

wattage N/A
component Control Board
resistance N/A
part_number Mitsubishi 9321A001
voltage_rating 230V AC

Common Questions

What does E8 error mean on Mitsubishi Air Conditioner?

The E8 error indicates a communication failure between the indoor and outdoor units, often causing the system to shut down.

Can I fix Mitsubishi Air Conditioner E8 error myself?

Yes, you can check the connections and clean the filters, but further diagnostics may require a technician.

How much does it cost to fix E8 error?

Repair costs can range from ¥10,000 to ¥60,000+, depending on the parts that need replacement.

When should I call a technician for E8?

Call a technician if you suspect wiring damage or if the error persists after checking filters and connections.

Data last verified: 2026-07-01

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