72
U2
U1
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 shell thermostat
and discharging temperature (TH32)
1 Check if stop valves are open.
2 Check if connectors (TH32, LEV-A) on outdoor controller board are not
disconnected.
3 Check if unit fills with specified amount of refrigerant.
4 Measure 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
1 Check if indoor/outdoor units have a short cycle on their air ducts.
2 Check if connector (63H) on outdoor controller board is not disconnected.
3 Check if heat exchanger and filter are not dirty.
4 Measure resistance values among terminals on linear expansion valve using a
tester.
1 Check if stop valves are open.
2 Check looseness, disconnection, and converse connection of compressor wiring.
3 Measure resistance values among terminals on compressor using a tester.
4 Check if outdoor unit has a short cycle on its air duct.
Compressor over current breaking (Start-up locked)
Compressor over current breaking
Abnormality of current sensor (P.B.)
Abnormality of power module
Open/short of discharge thermistor (TH32)
Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8)
1
Check if connectors (TH3 or TH32, TH6 and TH7) on outdoor controller board
and connector (CN3) on outdoor power board are not disconnected.
2
Measure resistance value of outdoor thermistors.
Abnormality of heatsink
temperature
1 Check if indoor/outdoor units have a short cycle on their air ducts.
2 Measure resistance value of outdoor thermistor(TH8).
1 Check the outdoor fan motor.
2 Check if the connector of TH3 on outdoor controller board is disconnected.
Abnormality of voltage 1 Check looseness, disconnection, and converse connection of compressor wiring.
2 Measure resistance value among terminals on compressor using a tester.
3 Check the continuity of contactor (52C).
4 Check if power supply voltage decreases.
5 Check the wiring of CNAF.
Abnormality of room temperature thermistor (TH1)
Abnormality of pipe temperature thermistor /Liquid (TH2)
Abnormality of pipe temperature
thermistor/Condenser-Evaporator
1 Check if connectors (CN20, CN21, CN29 and CN44) on indoor controller board
are not disconnected.
2 Measure resistance value of indoor thermistors.
Abnormality of drain sensor (DS)
Float switch (FS) connector open
Indoor drain overflow protection
1 Check if connector (CN31)(CN4F) on indoor controller board is not disconnected.
2 Measure resistance value of indoor thermistors.
3 Measure resistance value among terminals on drain-up machine using a tester.
4 Check if drain-up machine works.
5 Check drain function.
Freezing (cooling)/overheating
(heating) protection
1 Check if indoor unit has a short cycle on its air duct.
2 Check if heat exchanger and filter is not dirty.
3 Measure resistance value on indoor and outdoor fan motors.
4 Check 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.
2 Check if stop valve is open.
3 Check converse connection of extension pipe. (on plural units connection)
4 Check if indoor/outdoor connecting wire is connected correctly. (on plural units
connection)
P.37
P.37
P.38
P.40
P.41
P.40
P.38
P.38
P.38
P.38
P.39
*2
*2
*2
*2
*2
*2
Detailed
reference
page
Protection from overheat operation (TH3)
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