A957_O
Low Refrigerant Pressure (latched alarm)
This code typically points to
- Low-charge / airflow / EXV / restriction family
Next checks to confirm
- Evaluate low-pressure cause
- Same low-suction-pressure section applies as 21L
Escalation
4-hour lockout
Reset behavior
Automatic after lockout interval if fault clears; hard numeric 21L logic may still apply in repeated cases.
Urgent
Fix now