CRITICALError Code
E3: High Pressure Switch Trip
High pressure switch opened due to excessive refrigerant pressure.
What This Error Code Means
Refrigerant pressure exceeded the safe maximum limit.
Common Causes
Dirty outdoor coil
Outdoor fan not running
Refrigerant overcharge
Non-condensable gases
Restriction in circuit
Affected Brands
CarrierTraneDaikinLGSamsung
How ROMA Heating Fixes This Error Code
Clean outdoor coil
Check fan operation
Verify refrigerant charge
Check for restrictions
Test pressure switch
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