e1
Moderate
Carrier · Central Air Conditioners & Furnaces
Low Refrigerant / Low Pressure Fault
Quick Answer
Error code E1 on your Carrier Central Air Conditioners & Furnaces means: Low Refrigerant / Low Pressure Fault. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Check suction and discharge pressures with a refrigerant gauge manifold
2
Look for oil stains around fittings and coils as indicators of refrigerant leaks
3
Perform a leak test with an electronic leak detector or nitrogen pressure test
4
Check the metering device for proper superheat and subcooling readings
5
Only a licensed HVAC technician with EPA Section 608 certification may handle refrigerant
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
Refrigerant (R-410A or R-22 depending on system age)
TXV valve
Low-pressure switch
Leak repair materials (solder, brazing rods)
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