Mitsubishi Air Conditioner Error E1

⚡ Quick Answer: The E1 error code on Mitsubishi Air Conditioners signifies a communication failure between the indoor and outdoor units, often due to a malfunctioning... ✅ DIY Fixable

What Does Error E1 Mean?

The E1 error code on Mitsubishi Air Conditioners signifies a communication failure between the indoor and outdoor units, often due to a malfunctioning remote controller PCB. This results in the unit failing to operate, with the error displayed on the indoor unit or remote controller, and may cause the outdoor unit to remain inactive. Proper diagnosis and repair are essential to restore functionality.

Common Symptoms:

  • Error code E1 displayed on indoor unit or remote controller panel
  • Outdoor unit fails to start when E1 is shown
  • Remote controller may be unresponsive or display errors

Possible Causes

  • Remote controller hardware (remote PCB) failure (high)
  • Communication error between indoor and outdoor units (wiring/connection) (medium)

How to Fix Error E1

DIY Fix Basic checks and power cycle

  1. Turn off the air conditioner at the breaker or main power switch.
  2. Wait 5–10 minutes then restore power to reset control logic.
  3. Ensure remote controller batteries are fresh and properly seated.

Technician Only Inspect communication wiring and remote control PCB

  1. Disconnect power and access the indoor and outdoor unit terminals.
  2. Verify wiring continuity and correct connection between indoor and outdoor communication terminals.
  3. Inspect for loose, corroded, or damaged connectors and repair as needed.
  4. Test or replace the remote controller PCB if confirmed faulty.

Parts needed: Communication wiring harness, Remote controller PCB

🛑 When to Call a Pro:
  • Error code persists after basic resets and checks
  • Signs of wiring damage, corrosion, or PCB failure
  • Outdoor unit does not respond despite proper wiring and remote controller replacement

Technical Specifications

wattage N/A
component Control Board
resistance N/A
part_number Mitsubishi 5C-100-1
voltage_rating 220V AC

Common Questions

What does E1 error mean on Mitsubishi Air Conditioner?

E1 indicates a communication failure between the indoor and outdoor units, often due to remote PCB issues.

Can I fix Mitsubishi Air Conditioner E1 error myself?

Yes, you can perform basic checks like power cycling and ensuring fresh batteries in the remote.

How much does it cost to fix E1 error?

Repair costs for the E1 error typically range from $80 to $300, depending on location and parts.

When should I call a technician for E1?

Call a technician if the error persists after resets, or if you notice wiring damage or PCB failure.

Sources & References

Data last verified: 2026-07-01

User Comments (0)

Share your experience or solution below.

Be the first to comment!