Bosch BMS500-AAS030-1CSXRB User Manual

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Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit Service Manual
04.2020 | Bosch Thermotechnology Corp.Data subject to change
8.21 AC Voltage protection (J8)
Error Code J8
Malfunction decision conditions An abnormal voltage rise or drop is detected by checking the speciÀ ed voltage detection circuit.
Supposed causes
f Abnormal power supply
f Wiring mistake
f Bridge rectifier faulty
f IPM board faulty
Table 44
Troubleshooting:
Figure 64
A
C
p
o
w
e
r
i
n
p
u
t
v
o
l
t
a
g
e
AC power input voltage
protection enabled
C
h
e
c
k
w
h
e
t
h
e
r
t
h
e
p
o
w
e
r
v
o
l
t
a
g
e
i
s
n
o
r
m
a
l
.
Check whether the power
voltage is normal.
Measure outdoor
terminal voltage
to check if it is normal.
R
e
s
t
a
r
t
t
h
e
u
n
i
t
w
h
e
n
t
h
e
p
o
w
e
r
Restart the unit when the power
supply normalizes
No
Yes
No
Yes
Yes
No
R
e
p
l
a
c
e
t
h
e
I
P
M
b
o
a
r
d
,
Replace the IPM board, If the IPM and
main board are on the same board,
replace the outdoor main PCB
Yes
R
e
p
l
a
c
e
t
h
e
P
F
Replace the PFC module (If exists)
No
Yes
Check if the voltage between
L and N is normal.
Yes
Check if input voltage of
bridge rectifier is normal.
Yes
No
No
M
e
a
s
u
r
e
w
h
e
t
h
e
r
t
h
e
v
o
l
t
a
g
e
b
e
t
w
e
e
n
P
a
n
d
N
i
s
n
o
r
m
a
l
Measure whether the voltage
between P and N is normal
R
e
p
l
a
c
e
t
h
e
b
r
i
d
g
e
r
e
c
t
i
f
i
e
r
Replace the bridge
rectifier
No
C
h
e
c
k
w
h
e
t
h
er
b
r
i
d
g
e
r
e
c
t
i
f
i
e
r
i
s
n
o
r
m
a
l
C
Check whether
bridge rectifier is
normal
Check wiring connection
of reactor or inductance
h
e
c
k
w
h
e
t
h
e
r
r
e
a
c
t
o
r
o
r
i
n
d
u
c
t
a
n
c
e
i
s
n
o
r
m
a
l
C
o
Check whether reactor
or inductance is normal
Yes
R
e
p
l
a
c
e
r
e
a
c
t
o
r
o
r
i
n
d
u
c
t
a
n
c
e
Replace reactor or
inductance
No
Check the connection
of power wires
Ensure wire connection
of L and N is firm
Ensure wire connection
bridge rectifier

Bosch BMS500-AAS030-1CSXRB Specifications

General

Brand	Bosch
Model	BMS500-AAS030-1CSXRB
Category	Air Conditioner
Language	English