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Rotenso · Split air conditioners · Rotenso Imoto wall-mounted inverter split

EH 0bIndoor PCB / Display board communication error

Name in the manufacturer's documentation (service manual): Indoor PCB / Display board communication error[1]

In plain words (editorial)

The indoor PCB gets no feedback from the display board. The manual's first step is to switch the power off and restart the unit 2 minutes later.

When to call a service technician: If the code returns, a technician checks the wiring and the boards.

✎ 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] Rotenso Imoto Series – IDU & ODU Units Service Manual (I21Xi, I26X, I35X, I50X, I70X), EN , p. 133 manufacturer document – copy from a distributor quote verified Indoor PCB / Display board communication error
  2. [2] Rotenso Imoto Series – IDU & ODU Units Service Manual (I21Xi, I26X, I35X, I50X, I70X), EN , p. 155 manufacturer document – copy from a distributor quote verified indoor pcb does not receive feedback from the display board
  3. [3] Rotenso Imoto Series – IDU & ODU Units Service Manual (I21Xi, I26X, I35X, I50X, I70X), EN , p. 155 manufacturer document – copy from a distributor quote verified communication wire
  4. [4] Rotenso Imoto Series – IDU & ODU Units Service Manual (I21Xi, I26X, I35X, I50X, I70X), EN , p. 155 manufacturer document – copy from a distributor quote verified • indoor pcb
  5. [5] Rotenso Imoto Series – IDU & ODU Units Service Manual (I21Xi, I26X, I35X, I50X, I70X), EN , p. 155 manufacturer document – copy from a distributor quote verified • display board
  6. [6] Rotenso Imoto Series – IDU & ODU Units Service Manual (I21Xi, I26X, I35X, I50X, I70X), EN , p. 155 manufacturer document – copy from a distributor quote verified power off, then restart the unit 2 minutes
  7. [7] Rotenso Imoto Series – IDU & ODU Units Service Manual (I21Xi, I26X, I35X, I50X, I70X), EN , p. 155 manufacturer document – copy from a distributor quote verified check the wirings and connections
  8. [8] Rotenso Imoto Series – IDU & ODU Units Service Manual (I21Xi, I26X, I35X, I50X, I70X), EN , p. 155 manufacturer document – copy from a distributor quote verified replace the indoor main pcb
  9. [9] Rotenso Imoto Series – IDU & ODU Units Service Manual (I21Xi, I26X, I35X, I50X, I70X), EN , p. 155 manufacturer document – copy from a distributor quote verified replace the display board