8 flashes
Easy Fix
Goodman · HVAC Systems (AC, Furnaces & Heat Pumps)
Low Flame Current
Quick Answer
Error code 8 flashes on your Goodman HVAC Systems (AC, Furnaces & Heat Pumps) means: Low Flame Current. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Remove the flame sensor and clean it thoroughly with fine emery cloth
2
Measure the flame current with a microamp DC clamp meter (target above 1.5 microamps)
3
Verify the furnace chassis is properly grounded to the electrical system ground
4
Check gas manifold pressure with a manometer and adjust if below specification
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Flame sensor
Emery cloth
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