66
U2
U7
U1
UL
U8
Ud
UF
UP
UH
U6
U3
U4
U5
U9
P1
P2
P9
P4
P5
P6
P8
Indication Error
Check
code
*1
Outdoor controller board
Contents Inspection method
LED1 (Green)
LED2 (Red)
3 blinking 1 blinking
2 blinking
3 blinking
*1 Check code displayed on remote controller
*2 Refer to service manual for indoor unit.
4 blinking
5 blinking
6 blinking
7 blinking
1 blinking
2 blinking
3 blinking
4 blinking
4 blinking
Abnormality of comp. surface
thermistor(TH34)
and discharging
temperature (TH4)
Abnormality of superheat due
to low discharge temperature
1Check if stop valves are open.
2
Check if connectors (TH4, TH34, LEV-A, and LEV-B) on outdoor controller
board are not disconnected.
3Check if unit is filled with specified amount of refrigerant.
4Measure resistance values among terminals on indoor valve and
outdoor linear expansion valve using a tester.
Abnormal high pressure (High
pressure switch 63H operated.)
Abnormality of outdoor fan
motor rotational speed
1Check if outdoor units have a short cycle on their air ducts.
2Check if connector
(63H/63L)
on outdoor controller board is not disconnected.
3Check if heat exchanger and filter is not dirty.
4Measure resistance values among terminals on linear expansion valve
using a tester.
1Check if stop valves are open.
2Check looseness, disconnection, and converse connection of
compressor wiring.
3
Measure resistance values among terminals on compressor using a tester.
4Check if outdoor unit has a short cycle on its air duct.
5Check leakage of refrigerant.
Compressor overcurrent
breaking(Startup locked)
Compressor overcurrent breaking
Abnormality of current sensor (P.B.)
Abnormality of power module
Open/short of discharge thermistor (TH4)
and comp. surface thermistor (TH34)
Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8)
1
Check if connectors (TH3, TH4, TH6, TH7 and TH34) on outdoor controller
board, and connector (CN3) on outdoor power board are not disconnected.
2Measure resistance value of outdoor thermistors.
Abnormality of heat sink
temperature
1Check if outdoor units have a short cycle on their air ducts.
2Measure resistance value of outdoor thermistor(TH8).
1Check the outdoor fan motor.
2Check if connector
(TH3)
on outdoor controller board is disconnected.
Abnormality of voltage 1Check looseness, disconnection, and converse connection of
compressor wiring.
2
Measure resistance value among terminals on compressor using a tester
.
3Check the continuity of contactor (52C).
4Check if power supply voltage decreases.
5Check the wiring of CN52C.
6Check the wiring of CNAF.
Abnormality of room temperature thermistor (TH1)
Abnormality of pipe temperature thermistor /Liquid (TH2)
Abnormality of pipe temperature
thermistor/Condenser-Evaporator
1Check if connectors (CN20, CN21, CN29 and CN44) and terminal
blocks on indoor controller board are not disconnected.
2Measure resistance value of indoor thermistors.
Note: Refer to the indoor unit's Installation Manual.
Abnormality of drain sensor (DS)
Float switch(FS) connector open
Indoor drain overflow protection
1Check if connector (CN31)(CN4F) and terminal blocks on indoor controller
board is not disconnected.
2Measure resistance value of indoor thermistors.
3
Measure resistance value among terminals on drain-up machine using a tester.
4Check if drain pump works.
5Check drain function.
Freezing (cooling)/overheating
(heating) protection
1Check if indoor unit has a short cycle on its air duct.
2Check if heat exchanger and filter is not dirty.
3Measure resistance value on indoor and outdoor fan motors.
4Check if the inside of refrigerant piping is not clogged.
Abnormality of pipe
temperature
1
Check if indoor thermistors(TH2 and TH5) are not disconnected from holder.
2Check if stop valve is open.
3
Check converse connection of extension pipe. (on plural units connection)
4Check if indoor/outdoor connecting wire is connected correctly.
(on plural units connection)
P.30
P.31
P.30
P.33
P.31
P.33
P.33
P.34
P.33
P.34
P.30
P.31
P.31
P.32,33
*2
*2
*2
*2
*2
*2
Detailed
reference
page
Protection from overheat operation(TH3)
Abnormal low pressure (Low
pressure switch 63L operated.)
Note: Refer to the indoor unit's Installation Manual.
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