12LRN
3 – 10
5. IPM check method
Turn off the power, let the large capacity electrolytic capacitor (C10) discharge completely, and dismount the IPM. Then, using a tester, check leak
current between C and E.
When using a digital tester, the (+) and (-) tester lead wires in the table must be reversed.
Values in ( ) are for digital tester.
6. DC Over Current Error ( 6-0 error)
Needle-type tester
Normal resistance value
(-)
(+)
P
N
(several M
)
U
V
W
Needle-type tester
Normal resistance value
(-)
(+)
U
N
(several M
)
V
W
* 1
Check the connection of compressor lead wire on PWB.
TU : RED
TV : WHITE
TW : ORANGE
* 2
Refer to "IPM CHECK METHOD".
* 3
Check the connection of compressor terminal marking.
Refer to " DISASSEMBLING PROCEDURE OUTDOOR UNIT".
* 4
Check to make sure thermistors are installed in correct portions.
Refer to "THERMISTOR TEMPERATURE CHARACTERISTICS".
Yes
No
䌙䌥䌳
䌎䌯
䌙䌥䌳
䌎䌯
Yes
* 1
No
abnormal
l
a
m
r
o
n
b
a
l
a
m
r
o
n
* 2
abnormal
normal
normal
* 3
Yes
abnormal
No
normal
e
d
o
m
g
n
il
o
o
C
e
d
o
m
g
n
it
a
e
H
4
*
4
*
l
a
m
r
o
n
b
a
l
a
m
r
o
n
b
a
l
a
m
r
o
n
l
a
m
r
o
n
l
a
m
r
o
n
b
a
l
a
m
r
o
n
b
a
䌎䌯
l
a
m
r
o
n
l
a
m
r
o
n
START
Replace PWB.
Modify compressor terminal
marking.
Clean indoor heat exchanger.
Fix IPM PWB with screws securely.
Modify or replace termistor.
Are valves(2-way
and 3-way) close?
Does compressor
rotate?
Check IPM
lead wire.
䋨䌕䌖䌗䋩
Check
䌉䌐䌍
short circuit.
Check compressor
terminal.
Does compressor
rotate?
Does compressor rotate
more than 30 seconds?
Is IPM PWB floating
from the heat sink?
Check the AC power
supply voltage when
compressor rotate.
(rated voltage±10%)
Cooling mode?
Check indoor
exchanger termistor and
discharge thermistor.
Check outdoor
exchanger termistor and
discharge thermistor.
Check indoor
heat exchanger.
Check outdoor
heat exchanger.
6-0 error memory is
recorded.
Check the refrigerant amount.
Check the discharge pressure.
Check the installation condition.
ReplacePWB
ReplaceCompressor
Fullyopenstopvalves
Modify the connection of
compressor lead wire on PWB.
Connect stable power supply.
Clean indoor heat exchanger.
Modify or replace termistor.
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