Bosch Climate 5000 Series Service Manual page 54

5 4 | Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units
8.6.8 High pressure protection (P1)
Error Code
Malfunction decision conditions
Supposed causes
Table 27
Troubleshooting:
Figure 62
Data subject to change
P1
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
High pressure protection
High pressure protection
Check whether the wiring
between the high pressure
between the high pressure
switch and outdoor PCB No
switch and
is correct and connected
properly
Yes
Check if the high
pressure protector
is broken
Method: Disconnect the plug.
Method:
Disconnect the plug.
Measure the resistance of the
the
Measure the resistance of
high pressure protector, if No
high pressure protector, if Replace the high pressure protector
the protector is normal the
the protector is normal the
value should be 0
Yes
Check whether the outdoor
Check whether the outdoor
ambient temperature is
Yes
ambient temperature is
higher than 50
higher than 50
No
Check if the outdoor unit
NO Ensure the outdoor unit is ven lated properly
is ventilated properly
Yes
Check if the outdoor fan runs
Check if the outdoor fan runs
No
properly
properly
Yes
Check whether the heat
Check whether the heat
Yes
exchanger is dirty
exchanger is dirty
No
Replace the outdoor
PCB
No
Check whether the refrigerant
Check whether the refrigerant
system is ok
system is ok
Correct wiring
Stop the unit
top the unit
Please refer to E8 fault
troubleshoo ng steps defined
in Sec on 8.6.7
Clean the heat exchanger
Clean the heat exchanger
Service Manual
08.2020 | Bosch Thermotechnology Corp.