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6-4

6-4 - Malfunction of indoor air thermistor (Heat reclaim ventilator)

Daikin · Simple Self Diagnosis by Malfunction Code | Daikin

What does 6-4 mean?

The temperature sensor for the indoor air intake in the heat reclaim ventilator is malfunctioning.

Common Causes

  • Faulty indoor air thermistor
  • Wiring issue
  • Obstruction near the sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off power to the unit.

  2. 2

    Ensure the sensor area is clean and unobstructed.

  3. 3

    Restore power and check the error code.

  4. 4

    If the error persists, contact a service 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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