Bosch IDS BOVA15 Installation Instructions Manual page 34

Installation Instructions
WARNING: HAZARDOUS VOLTAGE

When measuring resistance , make sure the unit is powered
off and wait 3 min before taking measurement.
P5 (Condenser coil temperature (T3) protection in cooling)
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
resistance of T3
in range of Table
15?
Yes
Are
T3 and T5 sensors
correctly placed after
service?
Yes
Is the
EEV/TXV working
normally?
Yes
Restart System
Figure 55
3 4 |
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 T3 sensor
No
Ensure they are
No
properly placed
Adjust or replace
No
EEV/TXV
P8 (DC outdoor fan motor protection)
Are outdoor
weather conditions
preventing the fan from
operating
normally?
No
Is the
Yes
motor insulation
resistance
>100KΩ?
No
Is the
resistance of two windings
(U2,V2,W2) (CN32) >36Ω, and/
or the resistance between
compressor winding and
ground >10MΩ?
No
Restart system
Figure 56
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
Power off until
severe weather
Yes
conditions subside
Replace motor
Yes
Replace motor
Yes