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UF

UF - Malfunction of transmission (accessory device) (System)

Daikin · Simple Self Diagnosis by Malfunction Code | Daikin

What does UF mean?

This code indicates a communication error with an accessory device connected to the system.

Common Causes

  • Accessory device wiring issue
  • Accessory malfunction
  • System configuration error

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off power to the main system.

  2. 2

    Check the wiring and connections of the accessory device.

  3. 3

    If possible, temporarily disconnect the accessory to see if the error clears.

  4. 4

    Restore power and test.

  5. 5

    If the error persists, contact a technician.

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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