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Blinking blue LED

Blinking blue LED — Unit is in standby mode

Daikin · Altherma 3 H HT W

What does Blinking blue LED mean?

The blue LED on the status indicator is blinking. This means the unit is currently in standby and not actively operating.

Common Causes

  • Unit is waiting for a command or schedule
  • System is idle

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the main menu for any active programs or schedules.

  2. 2

    If you expect the unit to be running, check the temperature settings and schedules.

  3. 3

    Ensure the unit is powered on and not turned off via the main menu.

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

Related Faults

Blinking red LEDBlinking red LED — An error has occurredContinuous 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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