AtL
Ambient temperature limited condition
This code typically points to
- Ambient beyond operating range
- Incorrect O/B thermostat setting
- T4 sensor fault
Next checks to confirm
- Verify ambient conditions
- Verify thermostat O/B configuration
- Check T4 sensor
Escalation
Limited condition, NOT necessarily a hardware failure.
Reset behavior
Clears when ambient returns to operating range.
Informational
No action needed