Samsung Heat Pump Error Code E485

E485 indicates a fixed compressor 1 discharge temperature sensor breakaway fault. The system detected that the CT sensor was reading over 5A (confirming the compressor is running) while the discharge temperature sensor read below the high pressure saturation temperature for more than 30 minutes. This combination tells the control board that the discharge sensor is either physically detached from the discharge line or has failed electrically.

A power reset may temporarily clear the fault display, but E485 will return if the underlying condition is not corrected. The fault requires the CT sensor to read over 5A and the discharge temperature to remain below saturation temperature for over 30 minutes, so if the sensor is still loose or failed, the error will reappear once the compressor has run long enough to retrigger the timer. Address the sensor attachment and condition before relying on a reset.

If the repair only requires reseating the sensor in its holder with no parts needed, the cost is primarily a service call fee, typically in the range of $75 to $150. If the discharge temperature sensor itself needs replacement, parts and labor combined generally fall in the range of $150 to $400 depending on the specific model and local labor rates. If the fault is related to a refrigerant charge issue requiring recovery, recharge, and leak diagnosis, costs can be higher.

The first diagnostic step, checking that the discharge temperature sensor is correctly seated in its holder and measuring its resistance, is something a knowledgeable DIYer can perform with a multimeter. However, if the fault involves refrigerant pressure issues, sensor replacement on the discharge line, or accessing internal heat pump components, a certified HVAC technician should handle the repair. Working around refrigerant circuits and high-voltage compressor wiring carries significant safety risks.

Continuing to operate the heat pump with E485 active is not recommended. The discharge temperature sensor is a critical protection input for compressor 1. If the sensor has truly failed or lost contact, the system loses the ability to detect an overheating condition at the compressor discharge, which can allow damaging temperatures to go undetected and potentially cause compressor failure. Shut the unit down and diagnose the sensor before resuming normal operation.