Mitsubishi Heavy Industries Error Codes

Mitsubishi Heavy Industries AC Error Codes

Mitsubishi Heavy Industries Error Codes

1. Split Systems
2. VRF Inverter Multi-System

1.Split Systems

Whether a failure exists or not on the indoor unit and outdoor unit can be know by the contents of remote controller eroor code, indoor/outdoor unit green LED (power pilot lamp and microcomputer normality pilot lamp) or red LED (check pilot lamp).

a.Check Indicator Table;

Indoor Unit Side

Error Code	Cause
E1	When multiple remote controllers are used for control, the power supply to some indoor units is OFF.
	Indoor unit PCB fault
	The remote controller wire Y is open. The remote controller wires X and Y are reversely connected. Noise is penetrating the remote control lines. The remote controller or indoor control PCB is faulty.
E5	Indoor / outdoor transmission error.
	Outdoor unit control PCB is faulty when the power is turned on, or the inverter parts are faulty.
	Outdoor unit microcomputer failure.
E6	Indoor unit heat exchanger thermistor failure
E7	Indoor unit return air thermistor failure
E8	Heating overload (indoor heat exchanger temperature is abnormally high) and indoor heat exchanger thermistor is faulty.
E9	The float SW operates (with FS only). Drain up kit wiring fault.
E10	When multi-unit control by remote controller is performed, the number of units is over (more than 17 units). Two remote controller are provided for one controller is performed.
E16	Fan motor is faulty (FDTA 501, 601 type, FDKN type)
E28	Remote controller thermistor failure
F4	Fan motor fault
P2	Transducer module protection
P3	Over current
P4	Discharge temperature of compressor overheat, ambient temperature overheat
P7	DC voltage of outdoor unit abnormal
P8	Leakage or reverse valve fault
F6	Outdoor sensor fault
FC	Compressor drive fault
A18	EPROM
A19	LAN/Master-Slave
A19	LAN/Master-Slave
A20	Voltage drop
E0	Display message
OL	Overload
LH	Low heat
rSt	Reset
	Outdoor coil freezing
E13	Freeze-prevention operation activated