Bosch IDS BOVA15 Installation Instructions Manual page 33

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
pressure in the
system?
No
Is the system
overcharged?
No
Is the
high pressure switch
wired correctly and resistance
≥1Ω?
No
Check
PFC module: power
on the unit, when the fan is
running, is the voltage
between P-N (CN3)
<310V?
No
Is the
compressor current
>11.5A for 2/3T and
>15.5A for
4/5T?
No
Restart system
Figure 53
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
Is the
Yes ambient temperature
>120°F?
Yes
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 high
Yes
pressure switch
Replace
Yes
Control Board
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
mode?
No
Are the service valves
open?
Yes
Is there abnormal
pressure in the
system?
No
Is the system
undercharged?
No
Is the
resistance of T5
in range of Table
16?
Yes
Is the
EEV/TXV working
normally?
Yes
Check
the winding resistance:
1.The resistance of two windings (U,V,W)
<1.5Ω for 2/3T and <1Ω for 4/5T
2.The resistance between compressor
winding and ground
>10MΩ
Yes
Is the
compressor current >11.5A
for 2/3T and >15.5A for
4/5T?
No
Restart System
Figure 54
Installation Instructions
Is the
Yes ambient temperature
>120°F?
Yes
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
Adjust or replace
No
EEV/TXV
Replace compressor
No
Yes Replace compressor
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