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
8.13 Low pressure protection (P6)
Error Code P6
Malfunction decision conditions
When the pressure of the system reaches a certain value, the low pressure protector will switch off.
After the pressure resume to normal, the protection code will disappear.
Supposed causes
f Wiring mistake
f Pressure protector faulty
f Indoor fan motor faulty
f Outdoor PCB faulty
f Refrigerant leak
Table 36
Troubleshooting:
Figure 56
Yes
Replace outdoor PCB
R
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p
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o
w
p
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s
s
u
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p
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Replace low pressure protector
No
Check if high pressure valve
core is fully open
No
S
t
o
p
t
h
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u
n
i
t
Stop the unit
Yes
Open high pressure valve
core fully
No
C
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Check if the indoor fan runs
properly in cooling mode
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.
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.
please refer to the solution of [fan
speed has been out of control
malfunction]. Find out the cause and
have it solved.
No
Yes
Yes
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o
k
Check whether the
refrigerant system is ok
No
Yes
No
Check wiring between the
low pressure protector
and ODU PCB
Connect it well
Disconnect the low pressure
protector and measure the
resistance of it. If the
protector is okay, the
value should be 0.
Check if the outdoor ambient
temperature is lower than low
end of operation range.

Bosch BMS500-AAU048-1AHCXB Specifications

General

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