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LG · Heat pumps · LG Therma V Monobloc (air-to-water heat pump)

CH05Bad communication between Main PCB assembly(Heater) and Main PCB assembly(Inverter) of the unit.

Name in the manufacturer's documentation (service manual): Bad communication between Main PCB assembly(Heater) and Main PCB assembly(Inverter) of the unit.[1]

In plain words (editorial)

The two main PCB assemblies inside the unit (heater side and inverter side) cannot communicate properly. The service documentation lists a disconnected or misconnected transmission connector or wire, a broken communication line or a faulty inverter PCB.

When to call a service technician: Call the installer – the wiring and boards are inside the unit.

✎ 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] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified 5 Bad communication between Main PCB assembly(Heater) and Main PCB assembly(Inverter) of the unit.
  2. [2] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified The connector for transmission is disconnected
  3. [3] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified The connecting wires are misconnected
  4. [4] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified The communication line is broken
  5. [5] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified Main PCB assembly(Inverter) is abnormal
  6. [6] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified Main PCB assembly(Heater) is abnormal
  7. [7] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified Wire connection between remote control panel and Main PCB assembly(Heater) should be tight.