Mitsubishi Heavy Industries Air Conditioning Fault Codes For PAC Multi Indoor and Outdoor systems V, VD, VF, VF/1, VG

PAC SELF-DIAGNOSIS INFORMATION
Inverter PAC Indoor Units	FDT		V, VD, VF, VF/1, VG
	FDTC		V, VD, VF, VF/1,
	FDU		VF, VF/1, VG
	FDUM		1, 1R, V, VD, VF, VF/1
	FDE		VG
	FDEN		V, VD, VF, VF/1
	FDF		VD
Error Code	Indoor PCB LEDs		Outdoor unit LEDs		Description of Fault	Possible Cause
	RED	GREEN (1)	RED	GREEN (1)
No Error Code	Off	Flashing	Off	Flashing	-	Normal Operation
	Off	Off	2x	Off	Indoor unit power supply	Power OFF, broken wire, blown fuse, broken transformer wire
	3x	Flashing	Off	Flashing	Remote controller wires	Poor or wrong connection, broken wire
					Remote controller	Faulty Remote controller
"W AIT" or "INSPECT I/U"	Off	Flashing	2x	Flashing	Communication error (indoor-outdoor)	Faulty interconnect wiring, faulty PCB
					Remote Controller	Improper setting of master and slav e by Remote Controller
E1	Off	Flashing	Off	Flashing	Communication error (indoor-remote control)	Poor or wrong connection, broken wire, intrusion of noise, faulty indoor PCB or
E5	2x	Flashing	2x	Flashing	Indoor - Outdoor communication fault	Poor connection, incorrect wiring, indoor or outdoor PCB
	2x	Flashing	Off	Flashing	Electrical Noise	CPU Runaway on Outdoor control PCB
					Outdoor Control PCB	Faulty Outdoor Control PCB (Communication Circuit)
	2x	Flashing	Off	Off	Outdoor Control PCB	Faulty Outdoor Control PCB or Power supply
E6	1x	Flashing	Off	Flashing	Indoor heat exchanger temp sensor	Faulty sensor, poor connection, faulty indoor PCB
E7	1x	Flashing	Off	Flashing	Indoor return air temp sensor	Faulty sensor, poor connection, faulty indoor PCB
E8	1x	Flashing	Off	Flashing	Indoor heat exchanger temp sensor	Heating ov erload, faulty sensor, faulty indoor PCB
E9	1x	Flashing	Off	Flashing	Float switch activ ated	Blocked drain, faulty pump, faulty indoor PCB, faulty float switch
E10	Off	Flashing	Off	Flashing	No. of indoor units connected	Too many units connected to 1 controller (MAX 16)
E14	3x	Flashing	Off	Flashing	Remote controller Fault	No master assigned to slav es, incorrect wiring, broken wire between master &
E16	1x	Flashing	Off	Flashing	Indoor fan motor	Faulty Indoor fan motor, poor connection, faulty indoor PCB
E18	1x	Flashing	Off	Flashing	Address S etting Error	Address setting error of master and slav e indoor units
E19	1x	Flashing	Off	Flashing	Mode Setting	Incorrect mode setting
E20	1x	Flashing	Off	Flashing	Indoor fan motor	Fan motor speed fault or faulty indoor Power PCB
E21	1x	Flashing	Off	Flashing	Panel Limit S witch error	Defectiv e limit switch, air inlet panel set, I/D control PCB
E28	Off	Flashing	Off	Flashing	Remote Controller temp sensor	Faulty Remote controller temp sensor

Mitsubishi Heavy Industries Air Conditioning Fault Codes For RAC Multi Indoor and Outdoor systems

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Orion Air Conditioning & Refrigeration Ltd

10 Grisedale Court,

Woburn Road Ind. Est.

Kempston,

Bedfordshire,

MK42 7EE,

United Kingdom