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Mitsubishi Electric · Heat pumps · Mitsubishi Electric Ecodan FTC7 controller (PUZ-WM/WZ, PUHZ-SW)

LJDHW operation error (type of external plate HEX)

Name in the manufacturer's documentation (service manual): DHW operation error (type of external plate HEX)[1]

In plain words (editorial)

Hot water (DHW) operation error with an external plate heat exchanger – the manual checks the DHW tank lower temperature thermistor (THW5B), reduced flow and the circulation pumps.

When to call a service technician: Contact your 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] Mitsubishi Electric Ecodan FTC7 PAC-IF081B-E / PAC-IF082B-E / PAC-IF083B-E – Installation Manual (DG79H200H02) , p. 33 official manufacturer document quote verified LJ DHW operation error (type of external plate HEX)
  2. [2] Mitsubishi Electric Ecodan FTC7 PAC-IF081B-E / PAC-IF082B-E / PAC-IF083B-E – Installation Manual (DG79H200H02) , p. 33 official manufacturer document quote verified check for disconnection of thermistor (dhw tank lower water temp.) (thw5b).
  3. [3] Mitsubishi Electric Ecodan FTC7 PAC-IF081B-E / PAC-IF082B-E / PAC-IF083B-E – Installation Manual (DG79H200H02) , p. 33 official manufacturer document quote verified flow rate may be reduced.
  4. [4] Mitsubishi Electric Ecodan FTC7 PAC-IF081B-E / PAC-IF082B-E / PAC-IF083B-E – Installation Manual (DG79H200H02) , p. 33 official manufacturer document quote verified check for water circulation pump function. (primary / sanitary)