Mitsubishi Electric · City Multi Air Conditioning Systems
This error indicates a low refrigerant level in the system. This can be caused by stop valves not fully open, defective sensors, or actual gas leakage.
Click steps to track your progress.
Ensure all stop valves on the outdoor unit are fully open.
Turn off the power to the unit at the circuit breaker for at least 5 minutes, then restart it.
Visually inspect the refrigerant lines and outdoor unit for any signs of leaks, such as oily residue.
If the error persists, contact a qualified HVAC technician.
A technician will check for refrigerant leaks, measure refrigerant levels, and inspect sensors and valves.