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P4

P4 - Malfunction of radiation fin temperature sensor (Outdoor Unit)

Daikin · Simple Self Diagnosis by Malfunction Code | Daikin

What does P4 mean?

The temperature sensor monitoring the radiation fins in the outdoor unit has detected an issue.

Common Causes

  • Faulty radiation fin sensor
  • Wiring problem
  • Overheating of the fins

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the unit's power supply.

  2. 2

    Ensure the outdoor unit's vents are clear of obstructions.

  3. 3

    Restore power and check if the error clears.

  4. 4

    If the error persists, a technician needs to inspect the sensor.

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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