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E5

E5 - Receiving Error (PAR W21)

Mitsubishi Electric · Air Conditioning

What does E5 mean?

Similar to E4, this receiving error usually stems from an incorrect refrigerant address configuration on the Ecodan unit.

Common Causes

  • Incorrect refrigerant address setting on SW1
  • Communication problems within the Ecodan system
  • Faulty Ecodan controller

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Confirm the refrigerant address setting on SW1 of the Ecodan is correct.

  2. 2

    Inspect communication wiring for faults.

  3. 3

    Power cycle the Ecodan system.

  4. 4

    Consult the Ecodan user manual for further guidance.

Browse all codes in this manual (170)
Verified technical data. Last updated: April 2026

Related Faults

0.5-second ON / 0.5-second OFF blinkUpper lamp blinks 0.5-second ON/OFF - Miswiring or serial signal error00Normal operation - No error codes1 beep during error display mode1 beep during error display mode - Unit has an error (different code)
Source: Mitsubishi Electric Air Conditioning
Open Manual (Page 35)Search more codes in this manual