Troubleshooting steps
Check for refrigerant leaks verify charge check airflow check pressure switch
HVAC Error Codes
E3 – Low pressure switch
Low pressure switch activated
Details
Low pressure switch has been triggered indicating insufficient system pressure.
Error typealarm
MeaningLow pressure
Typical causesRefrigerant leak low charge restricted airflow
SolutionsCheck for refrigerant leaks verify charge check airflow check pressure switch
Severityhigh
Catalog references
Where this appears
LennoxE3
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FAQ
Common questions
What causes low pressure?
Low pressure is caused by refrigerant leak or insufficient charge.
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