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Panasonic · Heat pumps · Panasonic Aquarea Bi-bloc (split), generation L (R290)

H99Indoor heat exchanger freeze prevention

Name in the manufacturer's documentation (service manual): Indoor heat exchanger freeze prevention[1]

In plain words (editorial)

In cooling mode the indoor heat exchanger got too cold and could freeze (freeze prevention), usually because of too little water flow.

When to call a service technician: If the code repeats, call the installer.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 190 manufacturer document – copy from a distributor quote verified H99 Indoor heat exchanger freeze prevention
  2. [2] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified During anti-freezing control in cooling operation, when the indoor refrigerant liquid temperature < 0°C.
  3. [3] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified Faulty water pump.
  4. [4] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified Insufficient water flow rate in system.
  5. [5] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified Water leak in system.
  6. [6] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified 2 way valve partially closed.
  7. [7] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified Clogged expansion valve or strainer.
  8. [8] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified Refrigerant shortage (refrigerant leakage).
  9. [9] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified Faulty indoor refrigerant liquid temperature sensor.
  10. [10] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified Faulty indoor unit PCB (main).
  11. [11] Service Manual – WH-SDC0509L3E5 / L6E5 + WH-WDG05/07/09LE5 (R290) (PAPAMY2307068CE) , p. 219 manufacturer document – copy from a distributor quote verified always switch off the power before remove and connect the component.