e4
Moderate
Goodman · HVAC Systems (AC, Furnaces & Heat Pumps)
Low Pressure Switch Open
Quick Answer
Error code E4 on your Goodman HVAC Systems (AC, Furnaces & Heat Pumps) means: Low Pressure Switch Open. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Check the evaporator coil and thaw if frozen before proceeding
2
Inspect the air filter and replace if dirty
3
Look for oil stains at refrigerant connections indicating leaks
4
Connect gauges and measure suction pressure
5
A licensed HVAC technician must perform leak detection and refrigerant charging per EPA regulations
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)
Low-pressure switch
TXV valve
Leak repair materials
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