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H90

H90 — Indoor/outdoor abnormal communication

Panasonic · Air Conditioning

What does H90 mean?

This error means there is abnormal communication between the indoor and outdoor units. It is detected over 1 minute after operation starts.

Common Causes

  • Internal/external cable connections issue
  • Indoor/Outdoor PCB fault

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the internal and external cable connections.

  2. 2

    Inspect the Indoor and Outdoor PCBs.

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 162)Search more codes in this manual