10 flashes
Moderate
Goodman · HVAC Systems (AC, Furnaces & Heat Pumps)
Line Voltage Polarity Reversed
Quick Answer
Error code 10 flashes on your Goodman HVAC Systems (AC, Furnaces & Heat Pumps) means: Line Voltage Polarity Reversed. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Verify polarity at the furnace disconnect using a multimeter or polarity tester
2
Check that hot connects to the correct terminal and neutral to the neutral terminal
3
Test the dedicated circuit at the electrical panel for proper wiring
4
Correct any reversed wiring found at the disconnect or junction box
5
A licensed electrician should investigate if the issue is within the electrical panel
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
Electrical wire
Wire connectors
Disconnect switch (if faulty)
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