U2
U7
U1
UL
U8
Ud
UF
UP
UH
U6
U3
U4
U5
U9
Indication Error
Check
code*
Outdoor controller board
Contents Inspection method
LED1 (Green)
LED2 (Red)
3 blinking 1 blinking
2 blinking
3 blinking
* Check code displayed on remote controller
** Refer to service manual for indoor unit.
4 blinking
5 blinking
6 blinking
7 blinking
1 blinking
4 blinking
4 blinking
Abnormality of discharging
temperature (TH4) and Comp.
surface temperature (TH33)
Abnormality of superheat due
to low discharge temperature
1Check if stop valves are open.
2Check if connectors (TH4, 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.)
Abnormal low pressure (Low
pressure switch 63L operated.)
Abnormality of outdoor fan
motor rotational speed
1Check if indoor/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(Start-up locked)
Compressor overcurrent breaking
Abnormality of current sensor (P.B.)
Abnormality of power module
Open/short of outdoor
thermistors (TH4, TH33)
Open/short of outdoor thermistors
(TH3, TH32, TH6, TH7 and TH8)
1Check if connectors
(TH3, TH32, TH4, TH33 and TH7/6)
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 indoor/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) (63HS) 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 if power supply voltage decreases.
4Check the wiring of CN52C.
5Check the wiring of CNAF.
Abnormality of room temperature
thermistor (TH1)
Abnormality of pipe temperature
thermistor /Liquid (TH2)
Abnormality of tank temperature
thermistor
1Check if connectors on indoor controller board are not disconnected.
2Measure resistance value of indoor thermistors.
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.23
P.24
P.23
P.26
P.24
P.26
P.26
P.27
P.26
P.24
P.23
P.24
P.24
P.25–
P.26
Detailed
reference
page
Protection from overheat
operation (TH3)
P.29P8
P9
P2
P1
**
**
**
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