Atl Troubleshooting - Bosch IDS 2.0 Service Manual

Service Manual

12.3.18 AtL Troubleshooting

LED display output:
Description:
Possible causes:
Table 46
Procedure:
Figure 33
1) Cooling:15~125°F, Heating:-4~86°F
2) See Section 13.4
Bosch Thermotechnology Corp. | 07.2021
AtL
Ambient Temperature Limited Condition
 Ambient temperature beyond operating range
 Incorrect O/B thermostat setting
 T4 sensor fault
Is the ambient
Yes
temperature
beyond operating
range? 1
No
Yes
Is the thermostat
set to energize O/B
in heating mode?
No
Yes
Did the T4 sensor
fail? 2
No
Restart system
No service required. Wait
for temperature to be within
range
Correct thermostat setting
Replace T4 sensor
Bosch IDS 2.0 | 59
Data subject to change