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Error code reference
LG HVAC Error Code 44
PCB sees ODU air sensor as open or shorted.
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What the 44 error code actually means
Your LG HVAC system has lost contact with the outdoor temperature sensor, either because the sensor is broken or has a wiring problem. The system cannot read outdoor air temperature, so it has stopped normal operation to protect itself. A technician will need to test the sensor and its wiring to find the exact cause.
Diagnostic procedure
The full 44 procedure
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1
First diagnostic step
Must be 5,600Ω at 38°C/100°F & 20,700Ω at 10°C/50°F. Ohm thermistor in water, measure water temperature; with perfect thermistor & plug connection, change PCB. PTAC LPxxxC: check DIP switch settings.
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Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Most common causes of 44
Ranked by how often they cause this code
- 1Failed ODU air thermistor
- 2Loose or corroded thermistor connector
- 3Damaged thermistor wiring
- 4Incorrect DIP switch settings (LPxxxC PTAC models)
- 5Faulty PCB
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Questions people ask about 44
What does 44 mean on a LG hvac?
Error code 44 means the main control board (PCB) is detecting an open or shorted signal from the outdoor unit air temperature sensor (thermistor). The board expects a specific resistance range from this sensor and has determined the reading is out of range. The unit will not operate normally until the fault is resolved. This can be caused by a failed sensor, damaged wiring, a loose connector, or in some cases a faulty PCB.
Will resetting my LG HVAC clear error code 44?
A power reset may temporarily clear the fault display, but the error will return if the underlying problem with the outdoor air thermistor or its wiring is not corrected. Because the PCB actively monitors the sensor signal during operation, any open or short condition will trigger the code again shortly after restart. A reset alone is not a repair and should not be relied upon.
How much does it cost to repair error code 44 on a LG HVAC?
Repair costs vary depending on the cause. If only the outdoor air thermistor needs replacement, parts and labor typically range from around 80 to 200 dollars. If the PCB is the failed component, costs are generally higher, often ranging from 200 to 600 dollars or more depending on the model and labor rates in your area. Getting a diagnostic assessment from a qualified technician before purchasing parts is advisable.
How do I fix error code 44 on my LG HVAC?
Start by disconnecting the outdoor air thermistor and measuring its resistance with a multimeter, comparing it against the reference values of 5,600 ohms at 38C/100F and 20,700 ohms at 10C/50F. If values are incorrect, replace the thermistor. If resistance is correct, inspect the wiring and connector for damage or corrosion. On LPxxxC PTAC models, also verify the DIP switch settings before replacing parts. If wiring and sensor both test good, the PCB will need to be replaced.
Is it safe to run my LG HVAC while error code 44 is active?
Error code 44 causes the unit to stop normal operation because it cannot accurately read outdoor air temperature. Attempting to force operation without a valid sensor reading could result in improper system behavior and potential equipment damage. It is best to leave the unit off and address the fault before resuming use.
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