LG Therma V CH43 fault code
LG Therma V heat pumps
What it means
High-pressure sensor open/short
The high-pressure transducer reads open or short.
Safety: Refrigerant-side work is R32 (A2L, mildly flammable) — no ignition sources, ventilate.
UK models this code applies to
From the LG service literature we hold (LG AWHP Service Manual MFL68682007 (© 2020, R32 Therma V) — error codes + component tables; scope: code SET & fan figure whole-range, compressor winding confirmed 12/14/16 kW, thermistor tables part-level) — not a scraped list.
Now the harder half: proving what caused it
CH43 names a symptom, not a root cause. In the app, the same code opens a guided investigation: what to measure first, the expected values for your exact model, and an honest verdict — including “nothing in this machine is broken” when that's what the readings say.
Chase CH43 on your machine →Free, no sign-up. Pick the model and follow LG Therma V's own chart for it, one question at a time.
Or watch one get chased — free demo →