TradeAssistIQHome

Daikin Altherma fault 7H-07

Water flow problem. pump de-blocking active

Heat pump

What it means

Unit detects that the water pump might be blocked. Water pump de-blocking routine started (30 minutes).

Likely causes

  1. Water pump blockage detected by unit
  2. Faulty refrigerant pressure sensor
  3. Poor water flow through high pressure side plate heat exchanger
  4. Incorrect refrigerant charge
  5. Wrong setting of [F-0D] pump operation
  6. Dirty water blocking the water filter
  7. NOT enough air purged from the system
  8. Air was purged from the water circuit after filling
  9. Water pump software control behaviour based on setting [F-0D]

Where to start

  1. No specific check/repair procedures can be performed to solve this error code
  2. Wait until the water pump de-blocking routine is finished (±30 minutes maximum)
  3. Check refrigerant pressure sensor

The full answer, free

  • 11 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 19), right under the answer
Ask about 7H-07 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