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F42

F42 — Outdoor heat exchanger temperature sensor abnormality

Panasonic · Air Conditioning

What does F42 mean?

This error signifies an abnormality with the outdoor heat exchanger temperature sensor. It appears if the issue persists for 5 seconds.

Common Causes

  • Outdoor heat exchanger temperature sensor is defective or disconnected

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if the outdoor heat exchanger temperature sensor is defective.

  2. 2

    Ensure the outdoor heat exchanger temperature sensor is properly connected.

Browse all codes in this manual (53)
Verified technical data. Last updated: April 2026

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Source: Panasonic Air Conditioning
Open Manual (Page 163)Search more codes in this manual