Samsung Air Conditioner Error Code E190

E190 is a pipe test error indicating the system detected no temperature difference at the indoor evaporator inlet sensor (EVA_IN), or detected temperature changes in the wrong indoor unit's EVA_IN sensor. This typically points to an address mismatch between the indoor unit and the MCU. The pipe test is a diagnostic routine that confirms refrigerant is flowing through the correct indoor unit during commissioning or testing.

A simple power reset may temporarily clear the error, but E190 will return if the underlying issue is not corrected. Because this error is tied to a pipe test routine and address configuration, the root cause must be identified and fixed before the system will pass the pipe test without triggering the code again.

If the fix is simply correcting an address setting or adjusting the MCU switch, the cost may only involve a service call fee, typically in the range of $75 to $150 depending on your location and technician. If a faulty EVA_IN temperature sensor needs replacement, parts and labor combined could range from $150 to $350. More complex issues involving refrigerant service or control board replacement will likely cost more.

Start by checking that the indoor unit's configured address matches the address set on the MCU's indoor unit setting switch. If those match, inspect the EVA_IN temperature sensor and its wiring for faults. Also verify that all service valves are open and refrigerant charge is adequate. If the address configuration is correct and the sensor checks out, the control board or sensor may need replacement.

E190 is not an immediate safety hazard, but it does indicate the system cannot confirm proper refrigerant distribution across indoor units. Operating the system long-term without resolving this error may result in uneven cooling, inefficient operation, or unnecessary wear on system components. It is best to resolve the issue promptly.