LG Therma V CH44 fault code
LG Therma V heat pumps
What it means
Outdoor air-temp sensor open/short
The outdoor air sensor reads open or short circuit.
Safety: Safe isolation before disconnecting sensors or working on the PCB.
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.
Therma V Monobloc S 5.5 kW (HM051MR U44)Therma V Monobloc S 7 kW (HM071MR U44)Therma V Monobloc S 9 kW (HM091MR U44)Therma V Monobloc S 12 kW (HM121MR U34)Therma V Monobloc S 14 kW (HM141MR U34)Therma V Monobloc S 16 kW (HM161MR U34)Therma V Monobloc S 12 kW 3-phase (HM123MR U34)Therma V Monobloc S 14 kW 3-phase (HM143MR U34)Therma V Monobloc S 16 kW 3-phase (HM163MR U34)
Now the harder half: proving what caused it
CH44 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 this code in the app →