Error Code Troubleshooting - Bosch IDS BOVA15 Installation Instructions Manual

Installation Instructions

15.11 Error Code Troubleshooting

WARNING: HAZARDOUS VOLTAGE

When measuring resistance , make sure the unit is powered
off and wait 3 min before taking measurement.
C3 (Condenser coil sensor (T3) is not reading correctly in cooling)
Is the
service valve
closed or the connection
pipe bent/
blocked?
No
Is the
location of T3
sensor wrong?
No
Is the
T3 sensor wire
plugged in
correctly?
Yes
Is the
resistance of
T3 sensor in the
range of Table
15?
Yes
Is the
T4 sensor wire
plugged in
correctly?
Yes
Is the
resistance of
T4 sensor in the
range of Table
15?
Yes
Is
there another
heat source near
T3/T4?
No
Replace control board
Figure 42
2 8 |
Open service valve or
Yes
replace the pipe
Yes
Correct the location
Refer to wiring
No diagram for
correct connection
No Replace T3 sensor
Refer to wiring
No
diagram for
correct connection
Replace T4 sensor
No
Remove all other
Yes
heat sources
WARNING: HAZARDOUS VOLTAGE

When measuring resistance , make sure the unit is powered
off and wait 3 min before taking measurement.
E4 (Temperature sensor fault (T3, T4, T5, T3L))
Is the
T3/T4/T5/T3L
sensor wired
correctly?
Yes
Is
ambient
temperature <5°F?
Yes
Is the
resistance of T3/T4/T3L
in the range of Table
15?
Yes
Is the
resistance of T5
in the range of Table
16?
Yes
Replace control board
Yes
Restart system
Figure 43
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)
Refer to wiring
No diagram for
correct wiring
No No need to service
No Replace sensor
Replace sensor
No