Bosch IDS BOVB20 - Page 38

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