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

CH27AC Input Instant over Current Error

Name in the manufacturer's documentation (service manual): AC Input Instant over Current Error[1]

In plain words (editorial)

Instant overcurrent at the AC input of the inverter PCB. The service manual names overload operation (pipe clogging, covering, EEV defect, refrigerant overcharge), compressor damage, abnormal input voltage, power line assembly problems or a damaged PCB.

When to call a service technician: Contact an LG-authorised service technician or 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] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 278 official manufacturer document quote verified 27 AC Input Instant over Current Error
  2. [2] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 278 official manufacturer document quote verified PCB(Inverter) input current is over 100 A(peak) for 2 us
  3. [3] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 278 official manufacturer document quote verified Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge)
  4. [4] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 278 official manufacturer document quote verified Compressor damage (Insulation damage/Motor damage)
  5. [5] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 278 official manufacturer document quote verified Input voltage abnormal (L,N)
  6. [6] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 278 official manufacturer document quote verified Power line assemble condition abnormal
  7. [7] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 278 official manufacturer document quote verified PCB assembly 1 Damage (input current sensing part)