Error Codes

Black = All Units

Red = 4, 5, 6 & 7 Series Blue = 8 Series Green = KX / KX2 / KXR

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
No Indication	-	Stays Off	Keeps Flashing	Stays Off	Keeps Flashing	No Fault	• Normal operation
	-	Stays Off	Lights Continuously	Stays Off	Lights Continuously	Indoor circuit board	• There is a unit, on the same network, where the indoor circuit board or the CPU has a fault
	-	Stays Off	Stays Off	Stays Off	Stays Off	Mains power	• No mains power detected (power off or power failure) • T phase wire is open circuit
	-	Flashes 3 times	Keeps Flashing	Stays Off	Keeps Flashing	Remote controller wiring	• Remote controller wires - X&Y connections are reversed • Remote controller wires - Y&Z connections are reversed • Remote controller wiring is open circuit. (X wire broken - a beep is produces and no indication is made. Z wire broken - no beep and no indication)
	Stays Off	Flashes 3 times	Keeps Flashing	Stays Off	Keeps Flashing	Infra red receiver wiring	• Open circuit or poor connection in receiver unit wiring. (Power - Red. Ground - Black)

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E1	Keeps Flashing	(1) Lights or Stays Off	Undefined	Stays Off	Keeps Flashing	Indoor circuit board	• Indoor circuit board or CPU failure
	Keeps Flashing	Flashes 3 times	Keeps Flashing	Stays Off	Keeps Flashing	Infra-red receiver	• Open circuit or poor connection in the signal cable (white) of the infra red receiver unit • Electrical noise interference of the infra red receiver unit
	-	-	-	-	-	Remote controller wiring	• Open circuit or poor connection of remote controller wiring • Electrical noise interference of the remote controller wiring. (Other electrical sources are too close to the controller cable causing interference)
	-	-	-	-	-	Indoor circuit board	• Defective communication circuit on indoor circuit board
	-	-	-	-	-	Indoor circuit board	• Indoor circuit board fault
	-	Stays Off	Keeps Flashing	Stays Off	Keeps Flashing	Interconnecting wiring	• The remote controller wires X,Y&Z are connected to A&B terminals on the indoor unit terminal block • The indoor/outdoor signal wires A&B are connected in a loop • Indoor circuit board or CPU fault
	-	(3) Flashes 3 times	Keeps Flashing	Stays Off	Keeps Flashing	Remote controller wiring	• A PAC remote controller is connected to the KX indoor unit • Remote controller wire Y is open circuit • Remote controller wires X&Y connections are reversed

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E2	-	Flashes Once	Keeps Flashing	Stays Off	Keeps Flashing	Indoor unit address	• Duplication of indoor unit address • More than 49 indoor units are connected on a network
	-	Stays Off	Keeps Flashing	Stays Off	Keeps Flashing	Indoor unit address	• Duplication of indoor unit number when addressing with the remote controller

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E3	Keeps Flashing	Flashes Twice	Keeps Flashing	Stays Off	Stays Off	Power Supply	• No mains power at indoor or outdoor unit (power off or power failure) • Outdoor unit circuit board fault
	Keeps Flashing	Flashes Twice	Keeps Flashing	Stays Off	Keeps Flashing	Interconnecting cable	• Open circuit or poor connection of the outdoor unit control cable • Incorrect address of the outdoor unit
	Keeps Flashing	Flashes Twice	Keeps Flashing	(1) Lights or Stays Off	Undefined	Outdoor unit power	• No mains power at outdoor unit (power off or power failure) • Outdoor unit circuit board fault
	Keeps Flashing	Flashes Twice	Keeps Flashing	Flashes 3 Times	Keeps Flashing	Outdoor unit address	• Incorrect address of the outdoor unit
	-	Flashes Twice	Keeps Flashing	Lights or Stays Off	Undefined	Outdoor circuit board	• Outdoor unit circuit board
	-	Flashes Twice	Keeps Flashing	Stays Off	Keeps Flashing	Incorrect address	• Incorrect address of the indoor unit • Incorrect address of the indoor unit and/or outdoor unit while trying to auto address (KX2 only)
	-	Flashes Twice	Keeps Flashing	Stays Off	Keeps Flashing	Interconnecting cable	• Open circuit or poor connection or outdoor unit control cable (outdoor unit address not detected)
	-	Flashes Twice	Keeps Flashing	Stays Off	Stays Off	Outdoor unit power	• No mains power at outdoot unit

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E4	Keeps Flashing	Flashes Once	Keeps Flashing	Stays Off	Keeps Flashing	Incorrect address	• Incorrect address of the indoor/outdoor unit

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E5	Keeps Flashing	Flashes Twice	Keeps Flashing	Flashes Twice	Keeps Flashing	Interconnecting cable	• Open circuit or poor connection of the outdoor unit control cable • Electrical noise interference of the interconnecting control wiring (other electrical sources are too close to the controller cable causing interference)
	Keeps Flashing	Flashes Twice	Keeps Flashing	Stays Off	Stays Off	Outdoor unit power	• No mains power at outdoor unit (power off or power failure) • The power cable is not connected to the outdoor circuit board
	Keeps Flashing	Flashes Twice	Keeps Flashing	(1) Lights or Stays Off	Undefined	Electrical noise	• The outdoor unit circuit board or CPU is out of control while current is flowing
	-	Flashes Twice	Keeps Flashing	32 sec Time Flash	Stays Off or Lights Continuously	Outdoor circuit board	• Outdoor unit circuit board or CPU failure
	-	Flashes Twice	Keeps Flashing	Stays Off	Keeps Flashing	Interconnecting cable	• Indoor/outdoor unit transmission error. Wires A&B have been swapped after mains power was turned on
	-	Flashes Twice	Keeps Flashing	Stays Off	Stays Off	Outdoor unit power	• No mains power at outdoor unit (power off or power failure)

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E6	-	Flashes Once	Keeps Flashing	Stays Off	Keeps Flashing	Indoor coil sensor	• Indoor unit heat exchanger sensor (ThIR) defective (resistance is open circuit or closed circuit) • Poor connection of sensor connector on the indoor PCB

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E7	-	Flashes Once	Keeps Flashing	Stays Off	Keeps Flashing	Indoor return air sensor	• Indoor unit return sensor (ThIA) defective (resistance is open circuit or closed circuit) • Poor connection of sensor connector on the indoor PCB

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E8	Keeps Flashing	Flashes Once	Keeps Flashing	Stays Off	Keeps Flashing	Heating overload	• Overload in heating (extraordinarily high indoor heat exchanger temperature)
						Indoor coil sensor	• Indoor unit heat exchanger sensor (ThIR) failure (resistance of sensor is closed circuit)
						Indoor circuit board	• Abnormality of the heat exchanger sensor input

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E9	-	Flashes Once	Keeps Flashing	Stays Off	Keeps Flashing	Condensate drain motor	• Drain motor (DM) failure (drain motor open circuit or the drain motor is disconnected from the indoor PCB)
						Condensate float switch	• High limit of condenssate still detected in drain tray (the drain motor can not remove the condensate - blockage in discharge pipe or condensate returning to drain tray) • Float switch stuck in high position
						Wiring of accessory	• Incorrect wiring of condensate drain kit (typically on wall mounted indoor units)
						Indoor circuit board	• Defective float switch input circuit on indoor PCB • Defective drain motor output circuit on indoor PCB

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E10	-	Stays Off	Keeps Flashing	Stays Off	Keeps Flashing	Number of indoor units connected	• 17 or more units are connected to one remote controller (maximum permitted: 16 indoor units)

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E11	-	Stays Off	Keeps Flashing	Stays Off	Keeps Flashing	Indoor unit address	• More than one indoor unit is connected to a remote controller while trying to address the unit from the remote controller

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E12	-	Flashes Once	Keeps Flashing	Stays Off	Keeps Flashing	Incorrect address	• One or more units (indoor or outdoor) are still addressed at 48 or 49 (factory setting) • While trying to auto address, one or more of the units (either indoor or outdoor) is not set at 49 • Auto address is not possible on the system you are commissioning (Auto address is only possible on a single KX2 system)

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E14	-	-	-	-	-	Master /slave set up	• Incorrect setting of SW2 on indoor unit PCB when setting up a master / slave system • Incorrect control wiring between master and slave(s) (XYZ) • Open circuit of control wiring between master and slave(s)

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E28	-	Stays Off	Keeps Flashing	Stays Off	Keeps Flashing	Remote controller sensor	• Failure of the sensor within the remote controller

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E30	-	Stays Off class="p"	Keeps Flashing	Flashes Once	Keeps Flashing	-	• Indoor/outdoor unit connected error

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E31	Keeps Flashing	Stays Off	Keeps Flashing	Flashes Twice	Keeps Flashing	Indoor unit address	• Duplication of an indoor unit address nmber (U00 - U47)
	-	Stays Off	Keeps Flashing	8 Time Flash	Keeps Flashing	Outdoor unit address	• Duplication of outdoor unit address • Incorrect outdoor unit address • Outdoor unit address number has been changed since the power was turned on

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E32	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Outdoor unit power	• The anti phase device has detected that two phases of the mains power need to be swapped. • The (L2) phase of the mains power (primary side of contactor) has been detected as open phase

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E33	Keeps Flashing	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Compressor current	• Abnormally high current drawn by compressor (CM) • Open phase detected at L1 or L3 (secondary side of contactor) • Faulty outdoor unit PCB
	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Compressor current	• Abnormal current drawn by inverter compressor (CM1) • Abnormally high current drawn by fixed speed compressor (CM2)

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E34	Keeps Flashing	Stays Off	Keeps Flashing	Flashes Twice	Keeps Flashing	Compressor current	• Abnormally low current (or no current) detected by (CT) on L3 • Open phase detected at L3 (secondary side of contactor)
	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Compressor current	• Abnormal low current (or no current) detected by (CT) on L3 • Open phase detected at L3 (secondary side of contactor) • Error on inverter board

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E35	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Compressor discharge temperature	• The discharge gas temperature is abnormally high (›70°C) • Insufficient refrigerant
						Outdoor heat exchanger sensor	• Outdoor unit heat exchanger sensor (ThOR) defective (resistance is open circuit or closed circuit) • Poor connection of sensor connector on the outdoor unit PCB

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E36	Keeps Flashing	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Compressor discharge temperature	• The discharge temperature is abnormally high • Insufficient refrigerant • Poor airflow through condenser coil • Compressor discharge temperature sensor (ThOD) defective
	-	Stays Off	Keeps Flashing	Flashes 5 Times	Keeps Flashing
	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E37	Keeps Flashing	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Outdoor heat exchanger sensor	• Outdoor unit heat exchanger sensor (ThOR) defective (resistance is open circuit) • Poor connection of sensor connection on outdoor unit PCB
	-	Stays Off	Keeps Flashing	Keeps Flashing	Keeps Flashing
	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E38	Keeps Flashing	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Outdoor air sensor	• Outside air temperature (ThoA) defective (resistance is open circuit) • Poor connection of sensor connection on outdoor unit PCB
	-	Stays Off	Keeps Flashing	Keeps Flashing	Keeps Flashing
	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E39	Keeps Flashing	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Compressor discharge temperature sensor	• Compressor discharge temperature sensor (ThOD) defective (resistance is open circuit) • Poor connection of sensor connection on outdoor unit PCB
	-	Stays Off	Keeps Flashing	Keeps Flashing	Keeps Flashing
	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E40	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	High Pressure Switch	• The high pressure switch (63H or 63H1) has tripped • System overcharged with refrigerant • One (or more) of the service valves is shut • Insufficient airflow (or no airflow) over the condensercoil
	-	Stays Off	Keeps Flashing	Flashes 3 Times	Keeps Flashing
	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E41	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Inverter Power Transistor	• The power transistor for the inverter has overheated

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E42	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Compressor Current	• Abnormally high current detected in inverter compressor

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E43	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Number of indoor units	• The maximum number of indoor units connected to one outdoor unit has been exceeded

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E45	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Inverter wiring	• Transmission error between inverter and outdoor unit PCB • Loose connection of (Cnl)

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E46	-	Stays Off	Keeps Flashing	Flashes Once	Keeps Flashing	Address setting	• There is a conflict of address settings • A combination of: automatic / manual / remote control addresses coexist on one network

Check Indications						Fault at	Details of fault
Receiver Unit (if applicable)		Indoor Circuit Board		Outdoor Circuit Board
Error Code	Red LED	Red LED	Green LED	Red LED	Green LED
E57	-	-	-	-	-	Refrigerant circuit	• Refrigerant leak or shortage of refrigerant
						Indoor heat exchanger sensor	• Indoor unit heat exchanger sensor (ThIR) is defective (short circuit)
						Indoor unit circuit board	• Indoor unit PCB defective (defective sensor input circuit)
						Address setting	• Incorrect addressing of SW1 when commissioning a Multi System