Skip to content
EN

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

L9Low primary circuit flow rate detected by flow sensor or flow switch (flow switches 1, 2, 3)

Name in the manufacturer's documentation (service manual): Low primary circuit flow rate detected by flow sensor or flow switch (flow switches 1, 2, 3)[1]

In plain words (editorial)

Low primary circuit flow detected by the flow sensor or flow switch. The manual says to check for water leakage, a blocked magnetic filter or strainer, and the circulation pump. If the flow sensor or switch itself does not work, it is replaced.

When to call a service technician: 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] Mitsubishi Electric Ecodan FTC7 PAC-IF081B-E / PAC-IF082B-E / PAC-IF083B-E – Installation Manual (DG79H200H02) , p. 33 official manufacturer document quote verified L9 Low primary circuit flow rate detected by flow sensor or flow switch
  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 See Action for L3. If the flow sensor or flow switch itself does not work
  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 If the flow sensor or flow switch itself does not work
  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 Caution: The pump valves may be hot, please take care.