The L4 error in Carrier AC occurs when there is a phase current sampling error, which means the system has detected an issue with the current flowing through one of the phases of the electrical supply to the air conditioner. This error typically relates to the power supply and the unit’s ability to properly monitor and balance the current in a multi-phase system. In a multi-phase electrical system, such as the one used in many air conditioners, the phase current is monitored to ensure that each phase is operating correctly. If there is a malfunction in the current sampling process, such as a failure to detect or correctly read the current in one of the phases, the L4 error is triggered. This can be caused by issues such as wiring problems, faulty sensors, or a malfunction in the circuit board that monitors the electrical current. To protect the air conditioning system from potential damage, the L4 error disables the compressor and other affected components. The system will remain in protection mode until the issue with the phase current sampling is resolved. Once the electrical components are checked and the error is cleared, the unit will reset and return to normal operation. To prevent the L4 error, it’s important to ensure that the electrical connections are secure, the power supply is stable, and the sensors are functioning correctly. Regular maintenance and checking of the electrical components can help avoid issues with phase current and keep the unit operating efficiently.

Meaning

Phase Current Sampling Error