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Mitsubishi Electric · Mitsubishi Electric Ecodan PUZ-WM outdoor unit (R32) · Procedure

Ecodan PUZ-WM: is the error code recurring or a one-off?

Summary (editorial)

Present and past check codes are logged. The service manual asks to consider temporary causes, re-check the installation and reset the logs after the work.

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

From the manufacturer's documentation (English source wording, with page)

  1. Present and past check codes are logged and can be displayed on the outdoor control board[1]
  2. Recurring trouble: judge and act according to 9-2 self-diagnosis action table[2]
  3. Not recurring, logged: consider temporary defects (protection devices, poor wiring, noise)[3]
  4. Re-check symptom, installation environment, refrigerant amount, weather, wiring[4]
  5. Reset check code logs and restart after service[5]
  6. Not logged: continue to operate unit for the time being if the cause is not ascertained[6]
  7. Upper limit of ambient temperature is 46 °C[7]

⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.

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] Mitsubishi Electric – Service Manual: Air to water heat pump units, outdoor unit PUZ-WM50VHA … PUZ-WM112YAA (OCH727 REVISED EDITION-A, 12/2023) (OCH727A (12/2023)) , p. 22 official manufacturer document quote verified Present and past check codes are logged
  2. [2] Mitsubishi Electric – Service Manual: Air to water heat pump units, outdoor unit PUZ-WM50VHA … PUZ-WM112YAA (OCH727 REVISED EDITION-A, 12/2023) (OCH727A (12/2023)) , p. 22 official manufacturer document quote verified Judge what is wrong and take a corrective action according
  3. [3] Mitsubishi Electric – Service Manual: Air to water heat pump units, outdoor unit PUZ-WM50VHA … PUZ-WM112YAA (OCH727 REVISED EDITION-A, 12/2023) (OCH727A (12/2023)) , p. 22 official manufacturer document quote verified Consider the temporary defects such as the work of
  4. [4] Mitsubishi Electric – Service Manual: Air to water heat pump units, outdoor unit PUZ-WM50VHA … PUZ-WM112YAA (OCH727 REVISED EDITION-A, 12/2023) (OCH727A (12/2023)) , p. 22 official manufacturer document quote verified Re-check the symptom, and check the installation
  5. [5] Mitsubishi Electric – Service Manual: Air to water heat pump units, outdoor unit PUZ-WM50VHA … PUZ-WM112YAA (OCH727 REVISED EDITION-A, 12/2023) (OCH727A (12/2023)) , p. 22 official manufacturer document quote verified Reset check code logs and restart the unit after finishing
  6. [6] Mitsubishi Electric – Service Manual: Air to water heat pump units, outdoor unit PUZ-WM50VHA … PUZ-WM112YAA (OCH727 REVISED EDITION-A, 12/2023) (OCH727A (12/2023)) , p. 22 official manufacturer document quote verified Continue to operate unit for the time being if the cause
  7. [7] Mitsubishi Electric – Service Manual: Air to water heat pump units, outdoor unit PUZ-WM50VHA … PUZ-WM112YAA (OCH727 REVISED EDITION-A, 12/2023) (OCH727A (12/2023)) , p. 26 official manufacturer document quote verified Upper limit of ambient temperature is 46