105
LED indications of fan operating condition (LED5 and LED6 on controller board)
Operation
LED5/LED6 (Red)
Lit
Normal (Stop)
Normal (Operating)
Fan stops.
Controller board is outputting waveform for fan driving.
Contents
Operation LED5/LED6 (Red) Importance
2 blinks
1
2
3
4
5
6 blinks
8 blinks
7 blinks
Abnormal
is detected
Abnormality of bus voltage: Abnormal if bus voltage inspected for 1.5msec. is less than 60V or more than 390V.
Abnormality of overcurrent: Abnormal if current value of DC bus in fan controller board is over the cut-off point.
Abnormality of startup failure: Abnormal if the operating speed does not reach 100rpm even 12 sec passed after startup.
Abnormality of position detection: Abnormal if the position of U-phase cannot be detected after starting up fan.
Abnormality of disconnection: Abnormal if the first pattern of U/V/W-phase position detected after startup is H/H/H or L/L/L.
Meaning of error code and detection method
Remark
These
LEDs
are not
used
for
service.
U2
U7
U1
UF
UP
UH
U6
U3
U4
U5
U9
P1
P2
P9
P4
P5
P6
P8
Indication
Error
Error
code
w
1
Outdoor controller board
Contents
Inspection method
LED1 (Green) LED2 (Red)
3 blinking 1 blinking
2 blinking
W
1 Error code displayed on remote controller
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)
Abnormality of super heat due
to low discharge temperature
1
Check if stop valves are open.
2
Check if connectors (TH4, LEV-A, and LEV-B) 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 worked.)
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 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 ther-
mistor (TH8)
Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8)
1
Check if connectors (TH3, TH4, TH6 and TH7) on outdoor controller board and conn-
ector (CN3) on outdoor power board are not disconnected.
2
Measure resistance value of outdoor thermistors.
Abnormality of radiator panel
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 the continuity of contactor (52C).
4
Check if power supply voltage decreases.
5
Check the wiring of CN52C.
6
Check the wiring of CNAF. (RP4~6VHA only)
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 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 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)
W
2 LED1 on power board for RP4, RP5 and RP6
1 blink: Power is supplied. 3 blinks: Power is supplied to warm up compressor.
2 blinks: Power is supplied to compressor. Blinking: Limited control is being performed.
P111
P112
P111
P113
P113
P113
P112
P112
P112
P112
P113
P106
P106
P108
P106
P107
P107
Detailed
reference
page
OCT04A-4.qxp 04.9.29 9:17 AM Page 105
