TradeAssistIQHome

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. Faulty refrigerant pressure sensor
  6. Poor water flow through high pressure side plate heat exchanger
  7. Incorrect refrigerant charge
  8. 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

  • 10 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 70), right under the answer
Ask about 7H-XX freeCreate a free account

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