LG · Heat pumps · LG Therma V Monobloc (air-to-water heat pump)
CH20Thermal fuse is damaged
Name in the manufacturer's documentation (service manual): Thermal fuse is damaged
[1]
In plain words (editorial)
The thermal fuse is damaged – cut off by abnormal overheating of the internal electric heater, a mechanical fault of the fuse, or a damaged wire.
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.
For technicians
Detection conditions (source text)
- This error will not happen if temperature of electric heater tank is below 80 °C[2]
Possible causes (source text)
⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.
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] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified
20 Thermal fuse is damaged
- [2] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified
This error will not be happened if
- [3] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified
Thermal fuse is cut off by
- [4] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified
Mechanical fault at thermal fuse
- [5] LG Therma V Monobloc – Installation manual (MFL68026607 Rev.21) (MFL68026607 Rev.21_062126) , p. 277 official manufacturer document quote verified
Wire is damaged