High Pressure Switch Open (J5) - Bosch Climate 5000 Series Service Manual

6 4 | Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit

8.19 High pressure switch open (J5)

Error Code
Malfunction decision conditions
Supposed causes
Table 42
Troubleshooting:
Figure 62
Data subject to change
J5
If the sampling voltage is not 5V, the LED displays a failure code.
Wiring mistake
Overload protector faulty
System block
Outdoor PCB faulty
High pressure protection enabled
Are the high pressure
Are the high pressure
switch and main control
switch and main control
board wired correctly?
Yes
Is the high
Is the high
pressure protector
pressure protector
broken?
broken?
Method:
Disconnect the plug.
Method: Method: Di Disconnect the plug. t th l
the
Measure the resistance of
the
Measure the resistance of
high pressure protector, if
high pressure protector, if
the protector is normal the
the protector is normal the
value is 0, Does a problem
value is o, Does a problem
still exist?
still exist?
Yes
Is the outdoor ambient
Is the outdoor ambient
temperature is higher than
Yes
temperature is higher than
50
50
No
Check if the outdoor unit
Check if the outdoor unit
NO
ventilation is good
ventilation is good
Yes
Is the outdoor fan running
Is the outdoor fan running
No
properly?
properly?
Yes
Yes
Is the heat exchanger dirty?
Is the heat exchanger dirty?
No
Replace outdoor main
Replace outdoor main
PCB. Is the problem Yes
. Is the problem
resolved?
resolved?
Connect high pressure
Connect high pressure onnect high pressure
No switch and main control
board
board board
No
Replace high pressure protector
Replace high pressure protector
Stop the unit
Stop the unit
Ensure that the outdoor unit
Ensure that the outdoor unit
ventilation is functioning properly
ventilation is functioning properly
please refer to the solution of [fan
speed has been out of control
speed has been out of control
malfunction] . Find out the cause and
malfunction . Find out the cause and
have it solved.
have it solved.
Clean the heat exchanger
Clean the heat exchanger
Vacuum the system and weigh-in
refrigerant as per the system
requirement
Service Manual
04.2020 | Bosch Thermotechnology Corp.