LG Heat Pump Error Code E283

E283 indicates a fault with the SUMP TEMP FIXED 2 sensor in the outdoor unit. The sensor circuit is either open, with a signal voltage above 4.95V, or shorted, with a signal voltage below 0.5V. This error is only triggered when the outdoor temperature is above -10°C. The system flags this fault to protect the compressor and refrigerant circuit from operating with inaccurate sump temperature data.

It is not advisable to continue operating the heat pump while this error is active. The SUMP TEMP FIXED 2 sensor plays a role in protecting the compressor and refrigerant circuit, and running the system without accurate sump temperature data could result in compressor damage or refrigerant-related issues. Address the fault before resuming normal operation.

Repair costs vary depending on the root cause. If the fix involves reseating a connector or cleaning terminals, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the SUMP TEMP FIXED 2 sensor itself generally adds $50 to $200 in parts. If the control board is at fault, replacement costs can range from $300 to $700 or more including labor, depending on the specific model and your location.

A knowledgeable DIYer can perform the initial checks, such as inspecting the sensor connector and measuring sensor resistance with a multimeter. However, accessing the outdoor unit control board and interpreting the resistance-versus-temperature table requires some technical comfort with electrical diagnostics. If the sensor or wiring needs replacement, a qualified HVAC technician is recommended, especially since working inside the outdoor unit involves electrical components that can store charge.

A power reset may temporarily clear the error display, but if the underlying fault with the sensor, connector, or wiring is still present, the code will return once the unit resumes operation and detects the out-of-range voltage signal again. A reset should only be performed after the root cause has been identified and corrected.