| Pc | Current detect circuit malfunction or Current sensor malfunction Faulty current sensor on PCB. | Air Conditioner | |
| PH | Over voltage protection for PN Check incoming power supply voltage is not too high. | Air Conditioner | |
| PL | Low PN voltage protection Incoming voltage is too low. | Air Conditioner | |
| PU | Capacitor charge malfunction Check inverter board capacitor and charging circuit. | Air Conditioner | |
| P5 | Over compressor phase current protection Check compressor winding resistance and power supply. | Air Conditioner | |
| P6 | Communication failure between main board and driver board Check internal wiring between PCBs in outdoor unit. | Air Conditioner | |
| P7 | IPM sensor circuit malfunction Inspect IPM temperature sensor. | Air Conditioner | |
| P8 | IPM high temperature protection Check outdoor fan, heat sink, and ensure normal airflow around inverter board. | Air Conditioner | |
| SAFE | Oven controls are unresponsive, 'SAFE' is displayed Info: The child lock feature has been activated. | Oven | |
| U1 | Compressor phase current detection circuit malfunction Check current detection circuitry on PCB. | Air Conditioner | |
| U2 | Compressor protection against loss of phase Check phase connections to the compressor. | Air Conditioner | |
| U3 | PN voltage drop protection Check power supply for severe voltage drops. | Air Conditioner | |
| U4 | Compressor reverse protection Check for correct phase sequence and wiring to the compressor. | Air Conditioner | |
| U5 | AC current detect circuit malfunction Inspect current detection circuit on the main board. | Air Conditioner | |
| U7 | 4-way valve reversal abnormal Check reversing valve and coil for proper operation in heat cycle. | Air Conditioner | |
| U8 | Disconnection of the exhaust temperature sensor Reconnect or replace exhaust temperature sensor. | Air Conditioner | |
| U9 | AC power zero voltage detect error Check power supply voltage quality and main PCB zero-cross detection circuit. | Air Conditioner | |
