LG Heat Pump Error Code E313

E313 indicates a discharge temperature sensor error on the fixed capacity compressor 2 in the outdoor unit. The control board has detected a sensor signal voltage above 4.95V (open circuit, corresponding to a reading below -30°C) or below 0.5V (short circuit, corresponding to a reading at or above 151°C). This fault is only triggered when outdoor temperatures are above -10°C. The system shuts down to protect the compressor from unmonitored overheating.

No, you should not continue operating the unit with E313 active. The discharge temperature sensor protects compressor 2 from overheating by allowing the control system to monitor refrigerant conditions. Without a valid sensor reading, the system cannot detect a damaging overtemperature condition, which could result in compressor failure. The unit will typically prevent operation automatically when this fault is active.

Repair costs vary depending on what has failed. If only the connector needs cleaning or reseating, a service call fee of roughly $80 to $150 may cover the work. Replacing the discharge temperature sensor typically adds $30 to $100 in parts. If wiring repairs or control board replacement are needed, total costs can range from $200 to $600 or more depending on parts availability and labor rates in your area.

Some steps, like checking the sensor connector for looseness or visible damage, are accessible to a knowledgeable DIYer. However, measuring sensor resistance, tracing wiring faults, and replacing components in the outdoor unit typically require basic electrical tools and familiarity with HVAC systems. Because this fault involves a compressor protection sensor, it is recommended to have a qualified technician perform the repair if you are not comfortable with electrical diagnostics.

A power reset may temporarily clear the fault display, but E313 will return if the underlying sensor, wiring, or connector problem has not been corrected. Because the fault condition is based on real-time voltage readings from the sensor circuit, the error will reappear as soon as the control board reads the signal again and finds it outside the valid range. Resetting without repairing the root cause does not resolve the problem.