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System malfunction

System still fails to operate normally — Temporary fault

Daikin · Altherma Heat Pumps

What does System malfunction mean?

If you have already checked the basic points (radiators, thermostat, power) and the system is still not operating as expected, a temporary internal fault might be preventing normal function. A full system reset may resolve this.

Common Causes

  • Unspecified temporary system malfunction
  • Transient internal error

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the mains power supply to your entire Daikin Altherma heat pump system.

  2. 2

    Wait for at least 60 seconds to allow the system to fully discharge.

  3. 3

    Turn the mains power supply back on to reset the system.

  4. 4

    Observe if the system now resumes normal operation.

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