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U8

U8 - Malfunction of transmission between remote controllers (Control System)

Daikin · Simple Self Diagnosis by Malfunction Code | Daikin

What does U8 mean?

If multiple remote controllers are used, this code indicates a communication error between them.

Common Causes

  • Wiring issue between controllers
  • Controller malfunction
  • Incorrect setup

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off power to the system.

  2. 2

    Check wiring connections for all remote controllers.

  3. 3

    Ensure controllers are compatible and correctly configured.

  4. 4

    Restore power and test.

  5. 5

    If the error remains, a technician should be consulted.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

6-06-0 - External protection device activated (Heat reclaim ventilator)6-16-1 - Malfunction of PCB (Heat reclaim ventilator)6-26-2 - Ozone density abnormal (Heat reclaim ventilator)
Source: Simple Self Diagnosis by Malfunction Code | Daikin
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