e5
Moderate
Goodman · HVAC Systems (AC, Furnaces & Heat Pumps)
Low Voltage Protection
Quick Answer
Error code E5 on your Goodman HVAC Systems (AC, Furnaces & Heat Pumps) means: Low Voltage Protection. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Measure voltage at the outdoor unit disconnect under load conditions
2
Verify voltage stays within the acceptable range (187-253VAC for 230V units)
3
Check all connections at the disconnect switch and outdoor unit terminal block
4
Verify wire gauge is adequate for the circuit length and amperage requirement
5
Contact a licensed electrician if supply voltage is consistently below the minimum threshold
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
Disconnect switch (if worn contacts)
Electrical wire (proper gauge)
Circuit breaker
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