Bosch Climate 5000 Series Service Manual page 56

5 6 | Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units
8.6.9 High pressure protection (P2)
Error Code
Malfunction decision conditions
Supposed causes
Table 28
Troubleshooting:
Figure 64
Data subject to change
P2
If the sampling voltage is not 5V, the LED will display the failure.
Improper / Incorrect Wiring
Over load protector faulty
System blockage
Outdoor PCB faulty
Low pressure protection
Low pressure protection
Check whether the wiring
between the low pressure
protector and the outdoor No
PCB is correct and well
connected
Yes
Check if low pressure
protector is damaged
Method: Disconnect the plug.
Method: Disconnect the plug.
Measure the resistance of the
Measure the resistance of the
low pressure protector. I f the
No
low pressure protector. I f the
protector is normal the value
should be o
o
Yes
Check whether the outdoor
Check whether the outdoor
ambient temperature is
ambient temperature is
Yes
within the system operation
range (refer to table 8)
No
Check whether valve core
Check whether valve core
of high pressure valve is
No
of high pressure valve is
opened
opened
Yes
Check if the indoor fan runs
Check if the indoor fan runs
No
properly in cooling mode
properly in cooling mode
Yes
Replace outdoor PCB
Replace outdoor
No
Does the system has sufficient
No
amount of refrigerant?
Yes
System should operate normally
Correct wiring
Replace the low pressure protector
Stop the system
Stop the
Fully open valve core of
high pressure valve
Please refer to E8 fault
troubleshooting steps
defined in Section 8.6.7
Charge the unit with proper
amount of refrigerant as
defined in the IOM
Service Manual
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