Error 190 — No temperature changes in EVA IN during pipe inspection or wrong address

What does 190 mean?

During a pipe inspection or system check, the EVA IN (evaporator inlet) temperature sensor shows no change, or the indoor unit has an incorrect address. This hinders accurate system diagnostics.

• Faulty EVA IN sensor
• Refrigerant flow issue preventing temperature change
• Incorrect address setting for the indoor unit
• Control board communication problem

Click steps to track your progress.

1. 1

   Verify the indoor unit's address settings to ensure it is unique and correctly configured.

2. 2

   Ensure refrigerant is properly flowing through the evaporator. This may require checking system pressures (professional task).

3. 3

   Inspect the EVA IN sensor and its wiring for secure connections and proper placement.

4. 4

   Power cycle the indoor unit and the entire system to clear any temporary glitches.

5. 5

   If the problem persists, a qualified technician should investigate sensor function or refrigerant issues.