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Daikin Altherma fault 7H-01

Water flow problem

Heat pump

What it means

System detects flow abnormality during operation.

Likely causes

  1. Air in the water circuit
  2. Water flow is too low
  3. Faulty or dirty magnetic filter/dirt separator
  4. Faulty water flow sensor
  5. Faulty water pump
  6. Faulty refrigerant pressure sensor
  7. Poor water flow through high pressure side plate heat exchanger
  8. Incorrect refrigerant charge
  9. Wrong setting of [F-0D] pump operation
  10. Dirty water blocking the water filter
  11. NOT enough air purged from the system
  12. Air was purged from the water circuit after filling
  13. Water pump software control behaviour based on setting [F-0D]

Where to start

  1. Check the water flow
  2. Clean the magnetic filter/dirt separator
  3. Perform an electrical check of the water flow sensor

The full answer, free

  • 13 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 16), 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.

Other Daikin Altherma fault codes