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No power

System not operating — Mains power switched off

Daikin · Altherma Heat Pumps

What does No power mean?

Your Daikin Altherma heat pump system will not function if the mains power supply is interrupted or switched off. This includes any dedicated switches for the indoor unit and the outdoor unit.

Common Causes

  • Mains power supply to the heating system or outdoor unit is turned off

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Locate all main heating switches, including any specifically for the outdoor unit.

  2. 2

    Ensure that all identified heating switches are securely in the 'ON' position.

  3. 3

    If power is still absent, check your main electrical consumer unit for any tripped circuit breakers.

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 green light (Room Temp)Cannot adjust room temperature settings — Room temperature function is off
Source: Daikin Altherma Heat Pumps
Open Manual (Page 11)Search more codes in this manual