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No green light (Room Temp)

Cannot adjust room temperature settings — Room temperature function is off

Daikin · Altherma Heat Pumps

What does No green light (Room Temp) mean?

If no green light is visible above the room temperature symbol on the controller, the room temperature function is currently switched off. This prevents you from adjusting the room temperature settings.

Common Causes

  • The room temperature function is not enabled or switched off

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Locate the power button (on/off icon) on your controller.

  2. 2

    Press the power button to switch the room temperature function ON.

  3. 3

    Verify that a green light now appears above the room temperature symbol.

  4. 4

    Attempt to adjust the room temperature settings again.

Browse all codes in this manual (10)
Verified technical data. Last updated: April 2026

Related Faults

Fault codeSystem not operating — Fault code displayed on controllerNo green light (DHW)Cannot adjust domestic hot water settings — DHW function is offNo hot waterNo hot water — Tank is empty or cold
Source: Daikin Altherma Heat Pumps
Open Manual (Page 8)Search more codes in this manual