Bosch BMS500-AAU048-1AHCXB User Manual

Service Manual Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit | 65
Bosch Thermotechnology Corp. | 04.2020
Data subject to change
8.20 Low pressure switch open (P6/J6)
Error Code J6/P6
Malfunction decision conditions If the sampling voltage is not 5V, the LED displays a failure code.
Supposed causes
f Wiring mistake
f Overload protector faulty
f System block
f Outdoor PCB faulty
Table 43
Troubleshooting:
Figure 63
Lo w p re ssu r e p r o t e ctio n enabled
A
r
e
t
h
e
l
o
w
p
r
e
s
s
u
r
e
p
r
o
t
e
c
t
o
r
a
n
d
m
ai
n
c
o
nt
r
o
l
b
o
a
r
d
w
i
r
e
d
p
r
o
p
e
r
l
y
?
Are the low pressure
protector and main control
board wired properly?
e
t
h
o
d
:
M
e
a
s
u
r
e
t
h
e
r
e
s
i
s
t
a
n
c
e
o
f
t
h
e
l
o
w
p
r
e
s
s
u
r
e
p
r
o
t
e
c
t
o
r
.
I
f
t
h
e
p
r
o
t
e
c
t
o
r
i
s
n
o
r
m
a
l
t
h
e
v
a
l
u
e
i
s
o
.
D
o
e
s
a
p
r
o
b
l
e
m
s
t
i
l
l
e
x
i
s
t
?
Method: Disconnect the connection
Measure the resistance of the
low pressure protector. If the
protector is normal the value is
0. Does a problem still exist?
Yes
Yes
e
c
o
n
n
e
c
t
t
h
e
l
o
w
p
r
e
s
s
u
r
e
Reconnect the low pressure
p r o t e cto r a n d m ain PCB
D
o
e
s
a
p
r
o
b
l
e
m
s
t
i
l
l
e
x
i
s
t
?
R eplace outdoor m ain PCB
Does a problem still exist?
No
R
e
p
l
a
c
e
l
o
w
p
r
e
s
s
u
r
e
p
r
o
t
e
c
t
o
r
Replace low pressure protector
No
I
s
t
h
e
l
o
w
p
r
e
s
s
u
r
e
p
r
o
t
e
c
t
o
r
b
r
o
k
e
n
?
Is the low
pressure protector
broken?
I
s
t
h
e
o
u
t
d
o
o
r
a
m
b
i
e
n
t
t
e
m
p
e
r
a
t
u
r
e
t
o
o
l
o
w
?
Is the outdoor ambient
tem pera ture too low?
No
S
t
o
p
t
h
e
u
n
i
t
Sto p th e u n it Yes
O
p
e
n
t
h
e
v
a
l
v
e
c
o
r
e
o
f
t
h
e
h
i
g
h
p
r
e
s
s
u
r
e
v
a
l
v
e
Open the valve core of the
high pressure valve
No
I
s
t
h
e
v
a
l
v
e
c
o
r
e
o
f
t
h
e
h
i
g
h
p
r
e
s
s
u
r
e
v
a
l
v
e
f
u
l
l
y
o
p
e
n
e
d
?
Is the valve core of the
high pressure valve fully
opened?
I
s
t
h
e
i
n
d
o
o
r
f
a
n
r
u
n
n
i
n
g
p
r
o
p
e
r
l
y
i
n
c
o
o
l
i
n
g
m
o
d
e
?
Is the indoor fan running
properly in cooling mode?
R
e
f
e
r
t
o
t
h
e
s
o
l
u
t
i
o
n
t
o
t
h
e
m
a
l
f
u
n
c
t
i
o
n
o
f
f
a
n
s
p
e
e
d
b
e
i
n
g
o
u
t
o
f
c
o
n
t
r
o
l
.
F
i
n
d
t
h
e
c
au
s
e
a
n
d
r
eso
l
v
e
t
h
e
p
r
o
b
l
e
m
.
Refer to the solution to the malfunction
of fan speed being out of control. Find
the cause and resolve the problem.
No
Yes
Yes
Vacuum the system and
weigh-in refrigerant as per
the system requirement
No

Bosch BMS500-AAU048-1AHCXB Specifications

General

Brand	Bosch
Model	BMS500-AAU048-1AHCXB
Category	Air Conditioner
Language	English