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Daikin Altherma fault 7H-XX

Water flow or volume too low

Heat pump

What it means

Symptom: Water flow or volume too low. If this symptom is determined, check the steps in error codes 7H-xx to solve the error.

Likely causes

  1. Water pump software control behaviour based on setting [F-0D]
  2. Dirty water blocking the water filter
  3. NOT enough air purged from the system
  4. Air was purged from the water circuit after filling
  5. Wrong setting of [F-0D] pump operation

Where to start

  1. Check the steps in error codes 7H-xx to solve the error, see section 2.3 Error based troubleshooting
  2. Check water pump start/stop conditions
  3. Check water filter

The full answer, free

  • 6 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 70), 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