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SUMMARY OF TROUBLESHOOTING METHOD FOR OUTDOOR UNIT
MODEL : RAC-70YHA4 AND RAC-80YHA4
Checking the IPM IC of IPM P.W.B.
1) Power off the unit.
2) Disconnect compressor wire connector between
compressor to IPM P.W.B.
3) Check the diode value between below point :-
a) Terminal U, V, W (+ side of multimeter probe) to
Terminal P (WHT wire) ( - side of multimeter probe).
It shall be around 0.40 to 0.43.
b) Terminal N (BLK wire) (+ side of multimeter probe) to
Terminal U, V, W ( - side of multimeter probe)
It shall be around 0.40 to 0.43.
**During normal running, DC voltage between below point are:-
a) Terminal P & Terminal N shall be around 320V
b) Terminal U, V, W (+ side of multimeter probe) to Terminal N
( - side of multimeter probe) shall be around 160V.
Checking the compressor
motor winding.
1) Power off the unit.
2) Disconnect compressor
wire connector between
compressor to IPM P.W.B.
3) Check the resistance
value between WHT, YEL,
RED wire of compressor
wire. It shall be same on all
terminals between 1Ω to 3Ω.
Checking the reactor winding.
1) Power off the unit.
2) Disconnect YEL and BRN
wire at TAB3 and TAB4 from
MAIN P.W.B.
3) Check the resistance value
between YEL & BRN wire of
reactor. It shall be around
0.01Ω to 0.1Ω.
** During normal running, DC
voltage between TAB 3 and
TAB4 shall be 17V to 20V.
Checking all the fuse continuity.
There are 5 fuses inside the MAIN
P.W.B.
1) Power off the unit.
2) Check the continuity of below fuse:
a) F1 (25A)
b) F5 (3.15A)
c) F6 (3.15A) d) F3 (3A)
e) F4 (2A)
Checking the power source.
1) Power ON the unit.
2) Check the AC voltage from power
source between terminal L and N.
It shall be around 240 ±10 V
Checking the connection of 1, 2, 3 terminal to the indoor.
1) Power ON the unit.
2) After around 1 minute, check the AC voltage between terminal as below table.
Connection condition
All connection OK
Terminal 1 no connection
Terminal 2 no connection
Terminal 3 no connection
WHT
WHT
U
YEL
YEL
V
RED
RED
W
CN21(BLU)
COMPRESSOR
CN22(BLU)
BRN
TAB4
TAB3
YEL
REACTOR
3A FUSE
3.15A FUSE
FUSE
3.15A FUSE
BRN
BLU
L
N
(GRN
& YEL)
POWER SOURCE
Voltage value between terminal
1 to 2
2 to 3
240V
around 0.3V
240V
0.1-0.4V
240V
100 - 120V
120-140V
240V
0.1-0.4V
Checking the fan motor
winding.
1) Power off the unit.
2) Disconnect fan motor wire
from CN24 of MAIN P.W.B.
3) Check the resistance value
between RED, WHT, BLK
wire of fan motor. It shall
be around 20Ω to 50Ω.
**During normal running, DC
voltage between RED, WHT,
BLK wire of fan motor (+ side
of multimeter probe) to
Terminal N (R741 leg) (- side
of multimeter probe) shall
be around 160V.
WHT
IPM P.W.B
BLK
P(+) N(-)
WHT
BLK
WHT
BLK
U
V
DRIVE
CIRCUIT
W
P N
CN24
(WHT)
2A FUSE
CN15
(WHT)
CN17
POWER
(WHT)
CIRCUIT
CN18
(WHT)
CN20
(WHT)
CN25
(WHT)
CN30
(WHT)
CN27
(WHT)
SWITCHING
POWER
CIRCUIT
CN2
(RED)
CN10
(RED)
MAIN P.W.B
CN9
(BLK/
BLU)
CN8
(WHT)
BLK
RED
WHT
1
2
3
(GRN
& YEL)
CONNECTION
TO INDOOR UNIT
Outdoor LD301
indication
1 to 3
240V
Off or 1 time blink
240V
9 times blink
9 times blink
240V
9 times blink
Test Run
1) Remove Terminal 3
connection.
2) Power ON the unit and
wait for 30 seconds.
3) Press and hold test
switch for 5 seconds.
Checking the expansion
valve winding.
1) Power off the unit.
2) Disconnect the
expansion valve from
CN15 of MAIN P.W.B.
3) Check the resistance
value between wire of
expansion valve as
below:-
a) WHT to BRN
b) ORN to BRN
c) YEL to RED
d) BLU to RED
It shall be around
46Ω ± 3.7Ω.
CAPA P.W.B
Checking the reversing
RED
OUTDOOR
valve winding.
WHT
FAN
MOTOR
1) Power off the unit.
BLK
2) Disconnect the reversing
valve wire from CN2 of
EXPANSION
MAIN P.W.B.
VALVE
6
3) Check the resistance
EEPROM
value between the wire
of reversing valve.
TEST
It shall be around
1.9kΩ.
MICON
Checking the outdoor
temperature thermistor.
DRM1
DRM2
1) Power off the unit.
DRM3
PSC
2) Disconnect the
B-12V
B-0V
thermistor wire from
SELF-CHECK
CN10 of MAIN P.W.B.
3) Check the resistance
REVERSING
value between the
VALVE
wire of thermistor.
It shall be around
OUTDOOR
TEMPERATURE
1.7kΩ ± 0.3kΩ.
THERMISTOR
Checking the defrost
DEFROST
THERMISTOR
thermistor.
1) Power off the unit.
OH
THERMISTOR
2) Disconnect the
thermistor wire from
CN9 of MAIN P.W.B.
3) Check the resistance
value between the
wire of thermistor.
It shall be around
1.7kΩ ± 0.3kΩ.
Checking the OH thermistor.
1) Power off the unit.
2) Disconnect the thermistor wire from
CN8 of MAIN P.W.B.
3) Check the resistance value between
the wire of thermistor.
It shall be around 25kΩ ± 5kΩ.
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