HIGHError Code
E4: Low Pressure Switch TripEmergency Diagnosis & Repair
Low pressure switch opened due to suction pressure dropping too low.
What This Error Code Means
Refrigerant suction pressure fell below minimum safe level.
Common Causes
Refrigerant leak
Circuit restriction
Evaporator frozen
Airflow restriction
Filter drier restricted
Affected Brands
CarrierTraneDaikinLGSamsungGoodman
How ROMA Heating Fixes This Error Code
Check refrigerant pressures
Look for leak signs
Inspect evaporator coil
Clean or replace filter
Repair leak and recharge
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