Bosch IDS BOVA20 - Error Code Troubleshooting

Installation Instructions
Bosch IDS BOVA20 & BOVC20 Split System Heat Pump - BTC 761703109 A (12.2023)
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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.
Figure 47
C3 (Condenser coil sensor (T3) is not reading correctly in cooling)
Is the
location of T3
sensor wrong?
Correct the location
Refer to wiring
diagram for
correct wiring
Replace control board
Yes
No
Yes
No
Is the
T3 sensor
wired correctly?
No
No
Is the
resistance of
T3 sensor in the
range of Table
15?
Yes
Replace T3 sensor
Is the
T4 sensor
wired correctly?
Refer to wiring
diagram for
correct wiring
Is the
resistance of
T4 sensor in the
range of Table
15?
Yes
No
Yes
Replace T4 sensor
WARNING: HAZARDOUS VOLTAGE
• When measuring resistance , make sure the unit is powered
off and wait 3 min before taking measurement.
Figure 48
E4 (Temperature sensor fault (T3, T4, T5, Th, T3L, TF))
Is the
T3/T4/T5/Th/T3L/TF
sensor wired
correctly?
Is the T4 (ambient
temperature) <-4°F?
Replace sensor
Replace sensor
Restart system
Refer to wiring
diagram for
correct wiring
No service required
No
Yes
No
Yes
No
Yes
No
Yes
Is the
resistance of T3/T4/Th/T3L
in the range of Table
15?
Is the
resistance of T5/Tf
in the range of Table
16?