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Daikin Altherma fault 7H

Flow error (minimum flow rate not reached)

Heat pump

What it means

Flow error generated when the minimum required flow rate cannot be reached in the water circuit, resulting in no heating or operation.

Likely causes

  1. Remotely controlled valves in space heating loops closed, restricting circulation
  2. Minimum flow rate of 22 l/min not guaranteed in the installation
  3. Delay after filling water circuit before commissioning can block pump rotor

Where to start

  1. Check that the minimum flow rate is guaranteed in all conditions, even if all valves are closed
  2. Verify both air purge valves (one on magnetic filter, one on backup heater) are open

The full answer, free

  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 17), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Daikin manual for the Altherma. Check the model on the data plate before you order parts.

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