Bosch BMS500-AAU036-1AHCXC - High Pressure Protection (PC 30)

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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
8.6.8 High pressure protection (PC 30)
Error Code PC 30
Malfunction decision conditions If the sampling voltage is not 5V, the LED will display the failure.
Supposed causes
f Improper / Incorrect Wiring
f Over load protector faulty
f System blockage
f Outdoor PCB faulty
Table 39
Troubleshooting:
Figure 71
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Check whether the wiring
between thehighpressure
switch and outdoor PCB
is correct and connected
properly
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:
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Method: Disconnect theplug.
Measurethe resistance of
the
high pressure protector,if
theprotectoris normalthe
value should be 0
Yes
Yes
Correct wiring No
Replacethe high pressure protector No
Check if the high
pressure protector
is broken
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5
0
ć
Check whetherthe outdoor
ambient temperature is
higher than 50ć
No
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Stop the unit Yes
Yes
Ensure the outdoor unit is venlated properly
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x
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r
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s
d
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t
y
Checkwhether theheat
exchangeris dirty
No
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Cleanthe heat exchanger Yes
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y
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m
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o
k
Checkwhether therefrigerant
system is ok
Replace the outdoor
PCB
No
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n
High pressure protection
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y
Check if the outdoor fan runs
properly
Please refer to E8 fault
troubleshoong steps defined
in Secon 8.6.7
No
Yes
NO
Check if the outdoor unit
is ventilated properly