8 blinks
Easy Fix
York · HVAC Systems (AC, Furnaces, Heat Pumps & Thermostats)
Low Flame Current
Quick Answer
Error code 8 blinks on your York HVAC Systems (AC, Furnaces, Heat Pumps & Thermostats) 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 with fine emery cloth or a light abrasive pad
2
Measure flame current with a microamp DC clamp meter during burner operation (target above 1.5 microamps)
3
Verify the furnace chassis is properly grounded to the home's electrical ground system
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
Flame sensor gasket
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