Samsung Heat Pump Error Code E145

E145 indicates that the compressor sump temperature exceeded 95 degrees Celsius for more than 5 minutes, triggering the thermal protection shutdown. The sump is the oil reservoir at the base of the compressor. The system shuts down at this threshold to prevent oil breakdown and compressor damage. A technician should connect Samsung S-net diagnostics and perform a test operation to identify the underlying cause.

No, it is not safe to force the system to run continuously while E145 is active. The code exists to protect the compressor from heat-related oil degradation and mechanical damage. Continued operation without addressing the cause can lead to complete compressor failure, which is a significantly more expensive repair than resolving the original issue.

After performing an error reset with Key 3, the technician should connect S-net to access live system data and run a test operation under the same conditions that caused the fault. The priority check is the digital compressor loading and unloading operation, specifically whether the solenoid is cycling the compressor between loaded and unloaded states as designed. Refrigerant pressures and airflow conditions should also be evaluated during the test run.

A reset using Key 3 will clear the fault and allow the system to restart, but it will not fix the underlying cause. If the conditions that triggered E145 have not changed, the fault will return. The reset is the first step in diagnostics, used to observe whether the issue recurs under the same operating conditions so the root cause can be identified.

Repair costs depend entirely on the root cause. If the fix involves cleaning coils, recharging refrigerant, or adjusting airflow, costs may range from around 150 to 400 dollars. If the digital compressor loading solenoid needs replacement, costs typically range from 300 to 700 dollars. A full compressor replacement, if damage has already occurred, can range from 1,200 to 2,500 dollars or more including labor.