e4
Moderate
Carrier · Central Air Conditioners & Furnaces
High Pressure Cutout
Quick Answer
Error code E4 on your Carrier Central Air Conditioners & Furnaces means: High Pressure Cutout. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Clean the outdoor condenser coil with a garden hose and approved coil cleaner
2
Verify the condenser fan motor is running and spinning in the correct direction
3
Check discharge pressure and compare to normal operating range for ambient temperature
4
Inspect for kinks or restrictions in the liquid line
5
A licensed HVAC technician should check refrigerant charge and verify no non-condensables are present
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Condenser fan motor
Condenser fan blade
High-pressure switch
Condenser coil cleaner
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