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Blinking red LED

Blinking red LED — An error has occurred

Daikin · Altherma 3 H HT W

What does Blinking red LED mean?

The status indicator LED is blinking red, signaling that the unit has encountered an error. You can view a short and a long description of the error on the unit's display.

Common Causes

  • System fault requiring investigation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Press the left dial to open the main menu.

  2. 2

    Navigate to the 'Error' option and select it.

  3. 3

    Press the dial again on the error screen to see a detailed description.

Browse all codes in this manual (11)
Verified technical data. Last updated: April 2026

Related Faults

Blinking blue LEDBlinking blue LED — Unit is in standby modeContinuous blue LEDContinuous blue LED — Unit is operatingEmergency mode text'Emergency' displayed — Heat pump failure or forced off
Source: Daikin Altherma 3 H HT W
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