Samsung Heat Pump Error Code E204

E204 indicates a compressor shutdown caused by sump temperature protection. The control system detected that the oil sump temperature at the compressor reached or exceeded 95°C for more than 5 minutes, which triggered a protective shutdown. This prevents permanent damage to the compressor from sustained thermal overload. The root cause must be identified and corrected before restarting the unit.

No. The E204 code means the compressor has already shut down as a safety measure. Attempting to repeatedly override or reset this fault without addressing the cause risks permanent compressor damage. The compressor is one of the most costly components in the system, and the protection logic exists specifically to prevent catastrophic failure. Keep the unit off until a technician has diagnosed and corrected the root cause.

Resetting the code with the K3 key clears the fault and allows the unit to restart, but it does not fix the underlying condition that caused the sump temperature to exceed 95°C. If the compressor loading cycle, PWM valve operation, refrigerant charge, or heat exchange capability are not inspected and corrected, the fault will recur. A permanent fix requires identifying and addressing the specific cause of the elevated sump temperature.

You can press the error reset key (K3) to clear the fault code and attempt a restart. However, if the underlying cause of the overtemperature condition has not been corrected, the error will return and the compressor will shut down again. Repeated resets without diagnosis can contribute to compressor wear. A qualified technician should connect to S-net to observe compressor loading and PWM valve behavior during operation before declaring the issue resolved.

Repair costs vary widely depending on the root cause. If the issue is a faulty PWM valve or sump temperature sensor, parts and labor typically run in the range of a few hundred dollars. If the compressor itself has sustained damage from repeated overtemperature events, replacement costs can range from several hundred to over a thousand dollars depending on the model. A diagnostic visit is necessary to determine the exact scope of the repair.