Understand the display
Daikin 7H: insufficient water flow
What the controller detected, safe checks and when to call an engineer.
7H · Daikin · Altherma
Official meaning: Insufficient water flow.
The system is not detecting enough water moving through the heating circuit.
What you can check
Record the complete code, including any suffix. Note whether heating, hot water or both have stopped. Follow only the homeowner instructions for your exact system.
Your next step
If the fault persists or heating is unavailable, ask a Daikin-experienced engineer to assess the system.
Every Daikin code we hold, with its source and the checks you can safely make, is on the error-code pages.
Source
Next step
Open the 7H code page →Related