The E2 error in Carrier AC indicates a zero crossing signal fault, which is a communication issue between the system’s control board and the power supply. In air conditioners, the zero crossing signal is used to determine the correct timing for switching the AC components (such as the compressor or fan) on and off. This signal helps manage the AC’s electrical load efficiently by ensuring that switches occur at the right point in the AC power cycle. When the E2 error is triggered, it means the system is unable to detect or process this zero crossing signal properly. This fault can arise due to electrical interference, issues with the control board, wiring problems, or a failure in the power supply that affects the zero crossing detection. As a result, the AC may not operate correctly, or certain components like the compressor or fans may fail to start or stop at the right times. To protect the system, the E2 error will typically cause the unit to stop functioning until the issue is resolved. Once the zero crossing signal fault is fixed—whether by repairing the wiring, replacing the control board, or addressing power supply problems—the system will reset and resume normal operation. Regular checks of the electrical components, including the wiring and control boards, can help prevent the E2 error and ensure the Carrier AC functions without interruption.

Meaning

Zero Crossing Signal Detected Fault