Bosch IDS BOVA15 Installation Instructions Manual page 36

Installation Instructions
WARNING: HAZARDOUS VOLTAGE

When measuring resistance , make sure the unit is powered
off and wait 3 min before taking measurement.
AtL (Ambient Temperature Limited Condition)
Is the
ambient temperature
beyond operating range?
Cooling mode: 40-120°F
Heating mode: 5-86°F
No
Is the
thermostat set to
energize O/B in heating
mode?
No
Is the
T4 sensor seated
correctly?
Yes
Is the resistance of T4
in the range of Table 15?
Yes
Restart system
Figure 59
3 6 |
No service required.
Yes
Wait for temperature
to be within range
Correct thermostat
Yes
setting
Refer to wiring
diagram for
No
correct connection
Replace T4 sensor
No
Bosch IDS BOVA15 Split System Heat Pump - BTC 761701317 A (02.2022)