Bosch BMS500-AAU048-1AHCXB 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
8.19 High pressure switch open (J5)
Error Code J5
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 42
Troubleshooting:
Figure 62
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Are the high pressure
switch and main control
board wired correctly?
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Method: Disconnect the plug.
Measure the resistance of
the
high pressure protector, if
the protector is normal the
value is 0, Does a problem
still exist?
Yes
Yes
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Connect high pressure
switch and main control
board
No
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Replace high pressure protector No
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?
Is the high
pressure protector
broken?
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5
0
ć
"
Is the outdoor ambient
temperature is higher than
50ć"
No
S
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Stop the unit Yes
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Check if the outdoor unit
ventilation is good
Yes
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Ensure that the outdoor unit
ventilation is functioning properly
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y
?
Is the heat exchanger dirty?
No
C
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Clean the heat exchanger Yes
Vacuum the system and weigh-in
refrigerant as per the system
requirement
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?
Replace outdoor main
PCB. Is the problem
resolved?
High pressure protection enabled
I
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f
a
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n
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p
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l
y
?
Is the outdoor fan running
properly?
s
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f
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.
F
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a
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s
o
l
v
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d
.
please refer to the solution of [fan
speed has been out of control
malfunction] . Find out the cause and
have it solved.
No
Yes
NO
Yes

Bosch BMS500-AAU048-1AHCXB Specifications

General

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