19
Low Pressure Switch Open
This code typically points to
- Low charge
- Restricted indoor airflow
- Low load conditions
- Refrigerant-side issue
Next checks to confirm
- Verify actual refrigerant conditions
- Verify airflow before condemning switch
Escalation
Repeated trips with verified airflow indicate refrigerant issue.
Reset behavior
Self-clears when pressure recovers; repeated trips may lock out.
Urgent
Fix now