270
Easy Fix
Lennox · HVAC Systems (AC, Furnaces & Heat Pumps)
Low Flame Current
Quick Answer
Error code 270 on your Lennox 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 and clean the flame sensor with fine emery cloth
2
Measure the flame current with a microamp meter (should be above 1.5 microamps)
3
Verify the furnace is grounded properly to the home's electrical ground
4
Check manifold gas pressure and adjust if necessary
5
Ensure the flame sensor is positioned so the flame wraps around the sensor rod
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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