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H91

H91 - Tank heater OLP abnormality

Panasonic · Aquarea Heat Pumps

What does H91 mean?

The Overload Protector (OLP) for the tank heater has activated or is disconnected. The system will stop operation after 60 seconds.

Common Causes

  • Tank heater OLP has disconnected
  • Tank heater OLP has activated

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the tank heater OLP for any signs of activation or disconnection.

  2. 2

    Reset the OLP if it has tripped.

  3. 3

    Ensure the tank heater is functioning correctly.

  4. 4

    Contact a qualified installer or service technician if the problem persists.

Browse all codes in this manual (69)
Verified technical data. Last updated: April 2026

Related Faults

2 beeps then pause2 beeps then pause - Overfill warning3 red flashes3 red flashes - Communication errorError Code DisplayError Code Display - Abnormality detected
Source: Panasonic Aquarea Heat Pumps
Open Manual (Page 76)Search more codes in this manual