Troubleshooting steps
Check refrigerant charge verify airflow clean condenser coil check pressure switch
HVAC Error Codes
E4 – High pressure switch fault
High pressure switch activated
Details
High pressure switch has been triggered indicating excessive system pressure.
Error typealarm
MeaningHigh pressure
Typical causesRefrigerant overcharge restricted airflow dirty condenser coil
SolutionsCheck refrigerant charge verify airflow clean condenser coil check pressure switch
Severityhigh
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CarrierE4
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FAQ
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What causes high pressure?
High pressure is caused by excessive refrigerant or restricted heat rejection.
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