Bosch BMS500-AAU036-1AHCXC - Compressor Discharge Temperature Protection (PC 06)

| 73
Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
8.6.11 Temperature protection of compressor discharge (PC 06)
Error Code PC 06
Malfunction decision conditions
When the compressor discharge temperature(T5) is more than 115°C for 10 seconds, the compressor
will stop and restart when T5 is less than 90°C.
Supposed causes
f Improper / Incorrect Wiring
f System refrigerant leakage
f Discharge temperature (T5) sensor faulty
f Outdoor PCB faulty
Table 42
Troubleshooting:
Figure 77
Temperature protection of
compressor discharge
C
h
C
C
e
c
k
w
h
e
t
h
e
r
t
h
e
c
o
m
p
r
e
s
s
o
r
d
i
s
c
h
a
r
g
e
t
e
m
p
.
i
s
m
o
r
e
t
h
a
n
1
1
°
Check whether the
compressor discharge temp. is
more than 115°C (239°F)
c
o
m
p
r
e
s
s
o
r
d
i
s
c
h
a
r
g
e
t
e
m
p
.
s
e
n
s
o
r
a
n
d
P
C
B
a
c
c
o
r
d
i
n
g
t
o
w
i
r
i
n
g
d
i
a
g
r
a
m
s
?
Check whetherthe
connection is corect between
compressordischarge temp.
sensor and PCBaccording
to wiring diagrams?
M
e
a
s
u
r
e
t
h
e
re
s
i
s
t
a
n
c
e
v
a
l
u
e
o
f
c
o
m
p
r
e
s
s
o
r
d
i
s
c
h
a
r
g
e
Measurethe resistance value
of compressordischarge
temp. sensor is within the normal
range according to Appendix 2.
No
Ye s
Ye s
No
C
or
r
e
c
t
t
h
e
w
i
r
i
n
g
c
o
n
n
e
c
t
i
o
n
Correct thewiringconnection
Fix leakage and
re-charge the system.
R
e
p
l
a
c
e
t
h
e
c
o
m
p
r
e
s
s
o
r
d
i
s
c
h
a
r
g
e
t
e
m
p
.
se
n
s
o
r
Replacethe compressor dischargetemp. sensorNo
Ye s
Replacehighpressure valveassembly
Ye s
No
R
e
p
l
a
c
e
o
u
t
d
o
o
r
m
a
i
n
P
C
B
Replaceoutdoor main PCB
No
Check if
there is any refrigerant
leakage