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Panasonic Aquarea T-CAP R32 fault H75

Low water flow during defrost process

Heat pump

What it means

Heating operation at low water temperature with lower water flow may trigger H75 during defrost process.

Likely causes

  1. Low water flow rate in water circuit
  2. Water flow below 15 l/min during main pump operation
  3. Flow switch fault or no flow detected
  4. Vacuum pump oil backflow into charge hoses without proper prevention
  5. Removing refrigerant pipes while compressor is running and valve is open

Where to start

  1. Check water flow through service setup (Pump Max Speed)
  2. Confirm the maximum water flow during main pump operation is not less than 15 l/min
  3. Verify water pump turns ON immediately upon indoor unit ON request

The full answer, free

  • 50 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 62), 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 Panasonic manual for the Aquarea T-CAP R32. Check the model on the data plate before you order parts.

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