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Operation 3 Times / Timer 06

Operation LED blinks 3 times and Timer LED shows 06 — Outdoor heat exchanger thermistor error.

Fujitsu · 410A Multi-Zone Mini-Split Systems

What does Operation 3 Times / Timer 06 mean?

The thermistor sensing the outdoor heat exchanger temperature is reporting an abnormal reading.

Common Causes

  • The outdoor heat exchanger thermistor is open (disconnected) or shorted (faulty connection).
  • The controller PCB is defective.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Power off the unit at the circuit breaker.

  2. 2

    Visually inspect the outdoor heat exchanger thermistor for visible damage or loose connections.

  3. 3

    Ensure the thermistor is correctly installed and not dislodged from its position.

  4. 4

    If the error persists, a technician should check the thermistor's resistance or the controller PCB.

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

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Source: Fujitsu 410A Multi-Zone Mini-Split Systems
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