36
Installation and Maintenance
Service Manual
14/18K:
24/28K:
43 Communication failure with Unit A
●
Ƽ
●
●
44 Communication failure with Unit B
Ƽ
Ƽ
●
●
45 Communication failure with Unit C
○
○
Ƽ
●
46 Communication failure with Unit D
●
○
Ƽ
●
47 Unit A freeze protection
Ƽ
○
Ƽ
●
48 Unit B freeze protection
○
●
Ƽ
●
49 Unit C freeze protection
●
●
Ƽ
●
50 Unit D freeze protection
Ƽ
●
Ƽ
●
51 Unit A
overheating prevention protection
○
Ƽ
Ƽ
●
52 Unit B
overheating prevention protection
●
Ƽ
Ƽ
●
53 Unit C
overheating prevention protection
Ƽ
Ƽ
Ƽ
●
54 Unit D
overheating prevention protection
○
○
○
Ƽ
55 Unit A communication wire misconnection or expansion valve malfunction
●
○
○
Ƽ
56 Unit B communication wire misconnection or expansion valve malfunction
Ƽ
○
○
Ƽ
57 Unit C communication wire misconnection or expansion valve malfunction
○
●
○
Ƽ
58 Unit D communication wire misconnection or expansion valve malfunction
●
●
○
Ƽ
Note: discharge the position in below pictures with discharge resistance after open the top cover and
check if the voltage is below 20V with universal meter, then begin to check.
1 IPM protection malfunction:
Main checking point:
● If the input voltage of the unit is within normal range?
● If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
● If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
● If the unit is overloaded? If the heat radiation of the unit is good?
● If the refrigerant charge is suitable?
Flow chart:
9.3 Malfunction Checking and Elimination
Compressor overload protection
Viewing malfunction code
through remote controller within
200s; displayed directly on
nixietube after 200s
H3
P
L
n
o
it
c
n
u
fl
a
m
e
r
a
w
d
r
a
H
h
c
t
a
m
t
o
n
o
d
t
i
n
u
r
o
o
d
t
u
o
d
n
a
t
i
n
u
r
o
o
d
n
I
E
E
n
o
it
c
n
u
fl
a
m
e
r
a
w
d
r
a
H
p
i
h
c
y
r
o
m
e
m
f
o
n
o
it
c
n
u
fl
a
M
Wrong connection of communication wire or malfunction of
electronic expansion valve
Hardware malfunction
dn
Malfunction of complete units current detection
Hardware malfunction
U5
3
L
n
o
it
c
n
u
fl
a
m
e
r
a
w
d
r
a
H
1
n
a
f
r
o
o
d
t
u
o
f
o
n
o
it
c
e
t
o
r
p
n
o
it
c
n
u
fl
a
M
Detection status of wrong connection of communication wire
or malfunction of electronic expansion valve
Operation status
dd
7
E
s
u
t
a
t
s
n
o
it
a
r
e
p
O
t
c
il
f
n
o
c
e
d
o
M
o
F
s
u
t
a
t
s
n
o
it
a
r
e
p
O
e
d
o
m
g
n
il
c
y
c
e
r
t
n
a
r
e
g
ir
f
e
R
L
A
s
u
t
a
t
s
n
o
it
a
r
e
p
O
n
a
f-
X
1
H
s
u
t
a
t
s
n
o
it
a
r
e
p
O
e
d
o
m
g
n
it
a
e
h
n
i
n
r
u
t
e
r
li
o
r
o
g
n
it
s
o
rf
e
D
Start failure of compressor
Viewing malfunction code
through remote controller within
200s; displayed directly on
nixietube after 200s
Lc
4
E
r
o
s
s
e
r
p
m
o
c
f
o
n
o
it
c
e
t
o
r
p
e
r
u
t
a
r
e
p
m
e
t
e
g
r
a
h
c
s
i
d
h
g
i
H
Overload protection
E8
5
E
n
o
it
c
e
t
o
r
p
t
n
e
rr
u
c
r
e
v
o
t
i
n
u
e
l
o
h
W
5
P
n
o
it
c
e
t
o
r
p
t
n
e
rr
u
c
e
s
a
h
p
r
o
s
s
e
r
p
m
o
C
Compressor desynchronizing
H7
d
L
n
o
it
c
e
t
o
r
p
e
s
r
e
v
n
i-
e
s
a
h
p
/
g
n
i
k
c
a
l-
e
s
a
h
p
r
o
s
s
e
r
p
m
o
C
IPM modular protection
H5
DC bus-bar low volt
L
P
n
o
it
c
e
t
o
r
p
e
g
a
H
P
n
o
it
c
e
t
o
r
p
e
g
a
tl
o
v
h
g
i
h
r
a
b
-
s
u
b
C
D
PFC protection
HC
7
U
l
a
m
r
o
n
b
a
s
i
e
v
l
a
v
y
a
w
-r
u
o
f
e
h
T
14/18K:
24/28K:
43 Communication failure with Unit A
●
Ƽ
●
●
44 Communication failure with Unit B
Ƽ
Ƽ
●
●
45 Communication failure with Unit C
○
○
Ƽ
●
46 Communication failure with Unit D
●
○
Ƽ
●
47 Unit A freeze protection
Ƽ
○
Ƽ
●
48 Unit B freeze protection
○
●
Ƽ
●
49 Unit C freeze protection
●
●
Ƽ
●
50 Unit D freeze protection
Ƽ
●
Ƽ
●
51 Unit A
overheating prevention protection
○
Ƽ
Ƽ
●
52 Unit B
overheating prevention protection
●
Ƽ
Ƽ
●
53 Unit C
overheating prevention protection
Ƽ
Ƽ
Ƽ
●
54 Unit D
overheating prevention protection
○
○
○
Ƽ
55 Unit A communication wire misconnection or expansion valve malfunction
●
○
○
Ƽ
56 Unit B communication wire misconnection or expansion valve malfunction
Ƽ
○
○
Ƽ
57 Unit C communication wire misconnection or expansion valve malfunction
○
●
○
Ƽ
58 Unit D communication wire misconnection or expansion valve malfunction
●
●
○
Ƽ
Note: discharge the position in below pictures with discharge resistance after open the top cover and
check if the voltage is below 20V with universal meter, then begin to check.
1 IPM protection malfunction:
Main checking point:
● If the input voltage of the unit is within normal range?
● If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
● If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
● If the unit is overloaded? If the heat radiation of the unit is good?
● If the refrigerant charge is suitable?
Flow chart:
