LUV INVERTER SERIES
Self-diagnostics and Trouble-shooting
42/38LUV028H
42/38LUV035H
42/38LUV052H
42/38LUV065H
42/38LUV070H
42/38LUV080H
Part 2 of 2
MA
JOR
CO
MPO
NEN
T C
HEC
KIN
G
Mo
del
B
ran
d
Term
inal
W
ind
ing
Res
ista
nce
(Ω)
MO
NO
-IN
V-0
9-H
P-I
Z
DA
108X
1C-2
0FZ
3 To
shib
a B
lue
– R
ed
Blu
e –
Bla
ck
Red
- B
lack
0.71±
8% (
200 C
) M
ON
O-I
NV
-12-
HP
-IZ
MO
NO
-IN
V-0
9-IZ
MO
NO
-IN
V-1
2-IZ
MO
NO
-IN
V-1
8-IZ
C
-6R
VN
93H
0N
San
yo
0.66
8 ±8%
(25
0 C)
MO
NO
-IN
V-2
4-IZ
C
-6R
Z14
6H1A
S
anyo
0 .
452 ±
8% (
250 C
)
CO
MPR
ESSO
R
Use a
mult
i-mete
r to m
easu
re th
e res
ista
nce
valu
e of
eac
h win
ding
.
Mea
sure
the
resi
stan
ce v
alue
of e
ach
win
ding
.
Mo
del
C
apac
ito
r Te
rmin
al
Win
din
g R
esis
tan
ce
(Ω)
(200 C
)
MO
NO
-IN
V-0
9-H
P-I
Z
YD
K24
-6G
2.
5μF/
45
0V
AC
Blu
e -
Red
21
3 ±
8%
M
ON
O-I
NV
-12-
HP
-IZ
MO
NO
-IN
V-0
9-IZ
R
ed -
Bla
ck
435 ±
8%
M
ON
O-I
NV
-12-
IZ
MO
NO
-IN
V-1
8-IZ
Y
DK
53-6
F
2.5μ
F/4
50
VA
C
Red
- B
lack
98
± 8
%
Blu
e -
Red
14
7 ±
8%
MO
NO
-IN
V-2
4-IZ
Y
DK
53-6
N
2.5μ
F/4
50
VA
C
Yel
low
- B
lack
97
± 8
%
Blu
e -
Red
18
0 ±
8%
OU
TDO
OR
FA
N M
OTO
R
IND
OO
R F
AN
MO
TOR
Mea
sure
the
resi
stan
ce v
alue
of e
ach w
indi
ng.
Mo
del
C
apac
ito
r W
ind
ing
Res
ista
nce
(Mai
n/A
ux.
) (Ω
)
MO
NO
-IN
V-0
9-IZ
R
PG
18H
1.
2μF/
45
0V
AC
37
5 /
377 ±
8%
MO
NO
-IN
V-0
9-H
P-I
Z
RP
G20
D
1.5μ
F/4
50
VA
C
400
/ 38
3 ±
8%
MO
NO
-IN
V-1
2-H
P-I
Z
MO
NO
-IN
V-1
2-IZ
MO
NO
-IN
V-1
8-IZ
R
PG
28
D
1.5μ
F/4
50
VA
C
260
/ 38
5 ±
8%
Red
– B
lack
: M
ain
Win
ding
Bla
ck –
Whi
te: A
uxill
iary
Win
ding
Po
siti
on
R
esis
tan
ce V
alu
e
Whi
te -
Red
23
1Ω ±
8% (
20℃
)
Red
- B
row
n 1 0
9Ω ±
8% (
20℃
)
Wh
ite
Re
d
Ye
llo
wB
lue
Gra
y
Bro
wn
Bla
ck
1 2 3 4 5
Gre
y
Blu
e
Ye
llo
w
Re
d
Wh
ite
Bla
ck
Bro
wn
MO
NO
-IN
V-2
4-IZ
Y
DK
36-4
C
3μF/
45
0V
AC
Res
ista
nc
e V
alu
e
Po
sit
ion
Ora
nge
- R
ed
Red
- P
ink
Yel
low
- R
ed
Red
- B
lue
MO
NO
-IN
V-0
9-H
P-I
Z
MP
2835
M
ON
O-I
NV
-12-
HP
-IZ
MO
NO
-IN
V-0
9-IZ
MO
NO
-IN
V-1
2-IZ
MO
NO
-IN
V-1
8-IZ
M
P24
23B
MO
NO
-IN
V-2
4-IZ
M
P24
23
Red
Yello
wB
lue
Pin
k
Ora
nge
1 2 3 4 5
Blu
e
Pin
k
Yello
w
Ora
nge
Red
LOU
VRE
STEP
PER
MO
TOR
Mea
sure
the
resi
stan
ce v
alue
of e
ach w
indi
ng.
200Ω±
7%
(25℃
)
Roo
m te
mp.
(T1)
sen
sor,
Ind
oor
coil
tem
p.(T
2) s
enso
r,
Out
door
coi
l tem
p.(T
3) s
enso
r,
Out
door
am
bien
t tem
p.(T
4) s
enso
r,
Com
pres
sor
exha
ust t
emp.
(Te)
sen
sor.
Mea
sure
the
resi
stan
ce v
alue
of e
ach
win
ding
by
usin
g th
e m
ulti-
met
er.
Som
e fr
eque
ntly
-use
d R
-T d
ata
for
T1,
T2,
T3
and
T4
sens
or:
Tem
per
atu
re (℃
) 5
10
15
20
25
30
40
50
60
Res
ista
nce
Val
ue
(KΩ
) 26
.9
20.7
16
.1
12.6
10
8
5.2
3.5
2.4
Tem
per
atu
re (℃
) 5
15
25
35
60
70
80
90
100
Res
ista
nce
Val
ue
(KΩ
) 14
1.6
88
56.1
36
.6
13.8
9 .
7 6.
9 5
3.7
Som
e fr
eque
ntly
-use
d R
-T d
ata
for
Te s
enso
r:
TEM
PER
ATU
RE
SEN
SOR
S
Mea
sure
the
resi
stan
ce o
f eac
h and
comp
are w
ith th
e tab
le pr
ovide
d.
020406080100
120
140
160
180
200
05
1015
2025
3035
4045
50
KΩ
℃
Te
T1,
T2,
T3,
T4
TEM
PER
ATU
RE,
RES
ISTA
NC
E TA
BLE
- A
LL S
ENSO
RS
•T
urn
off
th
e p
ow
er
an
d let
the in
vert
er
ele
ctr
oly
tic c
ap
acit
or (
C01,C
02,C
03
) d
isch
arg
e
co
mp
lete
ly. U
se a
sui
tabl
e te
ster
to c
heck c
on
tin
uit
y.
•W
he
n u
sin
g a
dig
ital te
ste
r, t
he (
+)
an
d (
-) t
este
r le
ad
wir
es in
the t
ab
le m
ust
be re
vers
ed
.
REC
TIFI
ER C
HEC
KIN
G
•T
urn
off
th
e p
ow
er a
nd a
llow
the
larg
e e
lectr
oly
tic
ca
pacit
ors
(C
01,C
02,C
03) t
o d
isch
arg
e c
om
ple
tely
.D
ism
ou
nt
the IP
M.
Us
ing
a te
ste
r, c
heck fo
r lea
kage
cur
rent
bet
wee
n C
and
E
•W
hen
usin
g a
dig
ital te
ste
r, t
he (
+)
an
d (
-) t
este
r lead
wir
es
mu
st
be r
evers
ed
as
show
n in
the
2 ta
bles
bel
ow.
INTE
LLIG
ENT
POW
ER M
OD
ULE
[IPM
] CH
ECK
ING
LUV HIGHWALL INVERTER ADVANCED DIAGNOSTICS
38LUV028/35H [Compressor DA108X1C-23EZ]
MAIN PCB
Main Chip IRMCK341
Indicator LED1
Colour Blue
Function Indicates chip status
Action Meaning Flashing slow [0.5Hz] Standby Energised [steady] Normal Flashing fast [2.5Hz] System error
38LUV052 [Compressor DA130S1C-20FZ]
MAIN PCB
Main Chip [TMP86P807NG]
Indicator LED 1
Colour Yellow
Function Indicates chip status
Power [+5V DC]
Indicator LED 4
Colour Red
Function Indicates DC volts
341 Chip [Sensorless motor control IC for appliances]
Indicators LED 5 LED 6
Colour Red Green
Function Indicates chip status
Red LED Green LED Meaning Indoor Code
Off On Standby mode None
On Off Normal operation None
Off Flash IGBT over current protection P0
On On DC voltage upper or lower limit exceeded P1
Flash On Chip engine error P1
Flash Off Chip engine start error P4
On Flash Chip engine phase missing P4
Flash Flash Communication error P4
Action Meaning
Flashing slow [0.5Hz] Standby
Energised [steady] Normal operation
Flashing fast [2.5Hz] System error
Action Meaning
Energised [steady] DC power
Off No power
See table below
38LUV052H-1 [Compressor DA130M1C-31FZ]
MAIN PCB
Main Chip TMP86FH09ANG
Indicator LED 2
Colour Yellow
Function Indicates chip status
Power +5V DC
Indicator LED 1
Colour Red
Function Indicates DC volts present
341 Chip Sensorless motor control IC for appliances
Indicators LED 4 LED 3
Colour Red Green
Function Indicates chip status
Red LED Green LED Meaning Indoor Code
Off On Standby mode None
On Off Normal operation None
Off Flash IGBT over current protection P0
On On DC voltage upper or lower limit P1 or P10 or P11 or P12
Flash Off Compressor speed out of control P4 or P46
On Flash Chip engine phase missing P4 or P43 or P44 or P45
Flash Flash Communication error P4 or P40
Flash On Chip 341 – EPROM error E5
Action Meaning
Flashing slow [0.5Hz] Standby
Energised [steady] Normal operation
Flashing fast [2.5Hz] System error
Action Meaning
Energised [steady] DC power normal
Off No power
See table below
38LUV065/70H [Compressor DA150S1C-20FZ]
MAIN PCB
Main Chip TMP86P807NG
Indicator LED 1
Colour Yellow
Function Indicates chip status
Power +5V DC
Indicator LED 4
Colour Red
Function Indicates DC volts
341 Chip Sensorless motor control IC for appliances
Indicators LED 5 LED 6
Colour Red Green
Function Indicates chip status
Red LED Green LED Meaning Indoor Code
Off On Standby mode None
On Off Normal operation None
Off Flash IGBT over current protection P0
On On DC voltage upper or lower limit exceeded P1
Flash On Chip engine error P1
Flash Off Chip engine start error P4
On Flash Chip engine phase missing P4
Flash Flash Communication error P4
Action Meaning
Flashing slow [0.5Hz] Standby
Energised [steady] Normal operation
Flashing fast [2.5Hz] System error
Action Meaning
Energised [steady] DC power
Off No power
See table below
38LUV080H [Compressor DA250S2C-30MT]
MAIN PCB
Main Chip TMP86FH46NG
Indicator LED 1
Colour Yellow
Function Indicates chip status
Power +5V DC
Indicator LED 2
Colour Red
Function Indicates DC volts present
IPM PCB
Intelligent Power Module
Indicator LED 1 LED 2 LED 3
Colour Red Green Red
Function Indicates status [see below] DC Power
Red LED 1 Green LED 2 Red LED 3 Meaning I/dr. Code
On Off
Off
No
pow
er Standby mode None
Off On Normal operation None
Flash Off IGBT current protection P0
On On DC voltage limit exceeded P1
Off Flash
On
Pow
er n
orm
al
[+3.
3V D
C] Compressor speed control P4
Flash On Chip engine phase missing P4
Flash Flash Communication error P4
On On Reserved for future use None
Action Meaning
Flashing slow [0.2Hz] Standby
Energised [steady] Normal operation
Flashing fast [2.5Hz] System error
Action Meaning
Energised [steady] DC power normal
Off No power
LUV Generation 2
TROUBLE SHOOTING
INDOOR UNITS
Indoor Unit Error Display
Display LED STATUS
E0 EEPROM parameter error
E1 Indoor / outdoor units communication protection
E2 Zero-crossing signal error
E3 Indoor fan speed has been out of control
E5 Open circuit or short circuit of outdoor temperature sensor or outdoor unit
EEPROM parameter error
E6 Open circuit or short circuit of room or evaporator temperature sensor
P0 IPM malfunction or IGBT over-strong current protection
P1 Over voltage or too low voltage protection
P2 Temperature protection of compressor top.
P4 Inverter compressor drive error
Note: E4 & P3: Reserved function.
Diagnosis and Solution
1. EEPROM parameter error diagnosis and solution
If the EEPROM chip
is welded on PCB,
replace the PCB
directly. Otherwise,
check whether the
EEPROM chip
plugged in PCB well?
Yes
No
Yes
Correct the connection.
Replace the indoor PCB.
Shut off the power supply and
turn it on 5 seconds later. Is it
still displaying the error code?
2. Indoor unit and outdoor unit communication protection error diagnosis and solution
Yes
Yes
Measure Vs, is it moving alternately
between positive value and negative
value?
(Vs is the voltage between S and N of
outdoor unit.)
Yes
Power off, then turn on the unit 5 seconds
later(reconnect the power wire).Is the error
still displaying after several minutes?
No
Yes
Change the outdoor Main PCB.
Power on. Is the error extinguished?
Check all the wirings between indoor and
outdoor, indoor PCB and outdoor PCB
following the wiring diagram. Are all the
wirings connected correctly?
Is the wiring to the indoor PCB
connected correctly?
Change the indoor PCB.
Yes
Change the outdoor main PCB.
No
Is the wiring to the outdoor PCB
connected correctly?
Power on. Is the error extinguished?
Change the outdoor main PCB.
No
3. Indoor fan speed has been out of control diagnosis and solution
Shut off the power supply
and turn it on 5 seconds
later.Is it still displaying
the error code?
S h u t o f f t h e p o w e r
supply, rotate the cross
fan by hand. Does it
rotate properly?
The unit operates normally.
Disassembly the
connection between
fan and motor, check if
the bearing is normal?
Replace the bearing.
Check the wires of
fan motor. Are all the
connections good?
No
Yes
No No
Replace indoor fan motor.
Yes
Correct the connections.No
No
Yes
Yes
Check the resistance value of
indoor fan motor, is it normal?
Replace indoor PCB.
Yes
4. Open circuit or short circuit of temperature sensor diagnosis and solution
Check the connections
between temperature
sensor and PCB. Are
the connections good?
Correct the connections.No
Yes
Yes Replace indoor or outdoor PCB.
Replace the sensor and
c h e c k i f t h e p r o b l e m
happen again?
Check the resistance value
of the sensor via table1
and table 2, is it normal?
No
5. IPM malfunction or IGBT over-strong current protection diagnosis and solution
Check if the wiring between
module PCB and compressor
connected correctly.
Correct the connection.No
Yes
IPM continuity check. Check if the IPM
terminal resistance values are uniform. Replace the module PCB.No
Check if the IPM installed correctly.
Yes
Correct the installation, tighten the
screws and apply silicon grease.No
Check if the outdoor fan
can run properly.
Yes
NoCorrect the connection of fan motor
or replace the fan motor.
Yes
Replace outdoor control PCB.
Does the problem still remain?
Replace the compressor.
Yes
6. Over voltage or too low voltage protection diagnosis and solution
Check if the power
supply is normal.
C h e c k i f a l l t h e
connections are good.
Disconnect the unit with power supply and try to
restart the unit when power supply gets normal.No
Yes
No Correct the connections.
Yes
Check if the voltage between
P and N is around DC 320V.
Replace outdoor control PCB.
No
7. High temperature protection of compressor top diagnosis and solution
Check if the air flow system
of indoor and outdoor units
are obstructed?
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.Yes
No
Yes
Yes
Turn off the power supply and turn
it on 10 minutes later.
Check if the unit can
start normally.No
Check if the refrigerant
charge volume is normal?
Recharge the correct
refrigerant volume.
Refrigerant system is blocked, such
as capillary or welded point of pipes.
Yes
Check if all the connection, especially
the connection of OLP (Over Load
Protector) sensor is good.
Correct the connection.No
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the OLP.No
Replace the outdoor control PCB.Yes
No
8. Inverter compressor drive error diagnosis and solution
Check all the wires between control
PCB, module PCB and compressor. Correct the connections.No
IPM continuity check. Check if the IPM
terminal resistance values are uniform.
Yes
Replace outdoor module PCB.No
Yes
Replace outdoor control PCB.
Does the problem remain?
Replace the compressor.
Yes
9. Zero crossing detection error diagnosis and solution
Check if the connections and
power supply is normal?
Correct the connections. Turn on the
unit when the power supply is good.No
Yes
Indoor PCB is defective.
Replace indoor PCB.
Safety
Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity power in
capacitor.
Electrolytic Capacitors
(HIGH VOLTAGE! CAUTION!)
Connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, - terminals of the electrolytic capacitor on the
contrary side of the outdoor PCB.
Note: The picture above is only for reference. The plug of your side may be different.
Main parts check
1. Temperature sensor checking
Disconnect the temperature sensor from PCB, measure the resistance value with a tester.
Temperature Sensors.
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor discharge temp.(T5) sensor.
Measure the resistance value of each winding by using the multi-meter.
Table 1:Some frequently-used R-T data for T1,T2,T3 and T4 sensor:
Temperature (℃) 5 10 15 20 25 30 40 50 60
Resistance Value (KΩ) 26.9 20.7 16.1 12.6 10 8 5.2 3.5 2.4
Table 2:Some frequently-used R-T data for T5 sensor:
Temperature (℃) 5 15 25 35 60 70 80 90 100
Resistance Value (KΩ) 141.6 88 56.1 36.6 13.8 9.7 6.9 5 3.7
Resistance value (KΩ)
T emperature (℃)
0
20
40
60
80
100
120
140
160
180
200
0 5 10 15 20 25 30 35 40 45 50
T5
T1,T2,T3,T4
LAK Self Diagnostics
The LED mounted on the Low Ambient Kit [LAK] provides indication of the following:
Type Contents LED Flashing
Error LAK ambient temp. sensor fault Flashes 7 times and then off for 2.5s, cyclically
Error Zero crossing signal fault Flashes 6 times and then off for 2.5s, cyclically
Error LAK pipe temp. sensor fault Flashes 5 times and then off for 2.5s, cyclically
Normal Power supply: 50Hz, working in heating mode
Flashes 4 times and then off for 2.5s, cyclically
Normal Power supply: 50Hz, working in cooling mode
Flashes 3 times and then off for 2.5s, cyclically
38LUV GEN1 AND 2 PCBs EXPLAINED On the original residential inverters, some models had a separate PCB for outdoor fan speed control. This PCB is called a low ambient kit [LAK].
2nd generation products now all have this low ambient control feature combined into the main PCB.
Not all 2nd generation PCB’s are backward compatible with 1st generation indoor units.
Be very specific about what product you have when ordering replacement spare parts.
This includes the PCBs, reactors and compressors.
Model Generation 1 Generation 2 Comments 38LUV28 1 PCB LAK & main PCB combined 38LUV35 1 PCB LAK & main PCB combined 38LUV52 2 PCB’s LAK separate from main PCB 38LUV65 2 PCB’s LAK separate from main PCB 38LUV70 2 PCB’s LAK separate from main PCB 38LUV80 1 PCB LAK & main PCB combined
38LUV52 1 PCB LAK & main PCB combined 38LUV065H 1 PCB LAK & main PCB combined 38LUV070H 1 PCB LAK & main PCB combined
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