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Panasonic · Heat pumps · Panasonic Aquarea T-CAP Monobloc, generation J (R32)

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 – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 164 official manufacturer document quote verified H99 Indoor heat exchanger freeze prevention
  2. [2] Service Manual – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 192 official manufacturer document quote verified During anti-freezing control in cooling operation, when the indoor refrigerant liquid temperature < 0°C.
  3. [3] Service Manual – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 192 official manufacturer document quote verified Faulty water pump.
  4. [4] Service Manual – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 192 official manufacturer document quote verified Insufficient water flow rate in system.
  5. [5] Service Manual – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 192 official manufacturer document quote verified Water leak in system.
  6. [6] Service Manual – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 192 official manufacturer document quote verified 2 way valve partially closed.
  7. [7] Service Manual – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 192 official manufacturer document quote verified Clogged expansion valve or strainer.
  8. [8] Service Manual – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 192 official manufacturer document quote verified Refrigerant shortage (refrigerant leakage).
  9. [9] Service Manual – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 192 official manufacturer document quote verified Faulty indoor refrigerant liquid temperature sensor.
  10. [10] Service Manual – Mono Bloc Unit WH-MXC09J3E5 / WH-MXC12J6E5 (Aquarea T-CAP, R32) (PAPAMY2101001CE) , p. 192 official manufacturer document quote verified Faulty indoor unit PCB (main).