60
LED indications of fan operating condition (LED1 on outdoor Fan controller circuit board)
Operation
LED1 (Red)
Lighted
Normal (Stop)
Normal (Operating)
Fan stops.
Controller board is outputting waveform for fan driving.
Contents
Operation LED1 (Red) Importance
2 blinks
1
2
6 blinks
Abnormal
is detected
Abnormality of bus voltage: Abnormal if voltage is less than 200V or more than 760V.
Abnormality of overcurrent: Abnormal if current value of DC bus in over the cut-off point.
Meaning of error code and detection method
Remark
This LED is not
used for service.
U2
U1
UF
UP
UH
U6
U3
U4
U5
U9
P1
P2
P9
P4
P5
P6
P8
Indication
Error
Error
code
w
1
Outdoor controller circuit board
Contents
Inspection method
LED1 (Green) LED2 (Red)
3 blinking 1 blinking
2 blinking
W
1 Error code displayed on remote controller
W
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 (TH4)
1
Check if stop valves are open.
2
Check if connectors (TH4, LEV-A) on outdoor controller circuit 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 worked.)
1
Check if indoor/outdoor units have a short cycle on their air ducts.
2
Check if connector (63H) on outdoor controller circuit board is not disconnected.
3
Check if heat exchanger and filter is 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 (TH4)
Open/short of outdoor thermistors
(TH3, TH32, TH6, TH7 and TH8)
1
Check if connectors (TH3, TH32, TH4, TH6 and TH7) on outdoor controller
circuit board and connector (CN3) on outdoor power circuit board are not
disconnected.
2
Measure resistance value of outdoor thermistors.
Abnormality of heat sink
temperature
1
Check if indoor/outdoor units have a short cycle on their air ducts.
2
Measure resistance value of outdoor thermistor(TH8).
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 if power supply voltage decreases.
4
Check CN5 wiring on the outdoor power circuit board or noise filter
circuit board.
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 and CN29) on indoor controller circuit
board are not disconnected.
2
Measure resistance value of indoor thermistors.
Abnormality of drain sensor (DS)
Indoor drain overflow protection
1
Check if connector (CN31) on indoor controller circuit 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.30
P.30
P.32
P.32
P.32
P.31
P.31
P.31
P.31
P.32
W
2
W
2
W
2
W
2
W
2
W
2
Detailed
reference
page
OC338B-2.qxp 06.7.11 10:54 AM Page 60
