Bosch IDS BOVB20 Installation Instructions Manual page 38

Installation Instructions
WARNING: HAZARDOUS VOLTAGE

When measuring resistance , make sure the unit is powered
off and wait 3 min before taking measurement.
P3 (Compressor over current protection)
Are
you running in force
mode?
No
Are the service valves
open?
Yes
Is there abnormal
Yes
pressure in the
system?
No
Is the system
overcharged?
No
Is the
high pressure switch
wired correctly and resistance
≥1Ω?
No
Did the compressor fail?
No
Restart system
Figure 67
3 8 |
Is the
Yes ambient temperature
>120°F?
No
Quit force mode
Open the service valves
No
Clear any blockage in the
refrigerant,Correct poor
heat exchange (air flow
restriction, motor failure)
Yes Adjust refrigerant
Replace high
Yes
pressure switch
Yes Replace compressor
WARNING: HAZARDOUS VOLTAGE

When measuring resistance , make sure the unit is powered
off and wait 3 min before taking measurement.
P4 (High compressor discharge temperature (T5) protection)
Are
you running in force
Yes
mode?
No
Are the service valves
open?
Yes
Is there abnormal
pressure in the
system?
No
Is the system
overcharged?
No
Is the
resistance of T5
in range of Table
16?
Yes
Restart System
Figure 68
Bosch IDS BOVB20 Split System Heat Pump - BTC 761701316 C (02.2022)
Is the
Yes ambient temperature
>120°F?
No
Quit force mode
Open the service valves
No
Clear any blockage in the
refrigerant,Correct poor
Yes
heat exchange (air flow
restriction, motor failure)
Yes Adjust refrigerant
Replace T5 sensor
No
Yes