Quick diagnosis
What this code is telling you
Most likely trigger
Carbon buildup on flame sensor rod
Recommended replacement
Furnace Flame Sensor
Diagnostic path
4 ordered checks
Part fit
Exact model number required
Safety first
Before opening the appliance
Unplug the appliance before removing panels or testing internal components. Do not bypass safety switches or live-test high-voltage, gas, refrigerant, or combustion components unless you are qualified to do so.
Read the full safety disclaimerRoot cause
Why the control reported this error
The furnace control locks out or reports this fault when the expected ignition, airflow, pressure, flame, or limit sequence is not proven. Check carbon buildup on flame sensor rod first, then verify poor furnace electrical earth ground connection and misaligned flame sensor outside of flame path before replacing furnace Flame Sensor.
Symptoms
What you may notice
- ✓Burners ignite for 2-5 seconds then shut off repeatedly
- ✓E2 code blinks on furnace display board
- ✓Home fails to warm up
Possible causes
Check the most likely causes first
- 1
Carbon buildup on flame sensor rod
Start here when it matches your symptoms.
- 2
Poor furnace electrical earth ground connection
- 3
Misaligned flame sensor outside of flame path
- 4
Faulty integrated furnace control (IFC)
Diagnostic sequence
Work through these checks in order
Stop when you find the fault. Do not perform a step that requires skills or live testing you are not qualified to do.
- 1
Check 1
Shut off power, remove flame sensor, and clean steel probe with fine Scotch-Brite pad.
- 2
Check 2
Check ground wire screw on furnace cabinet for tightness and paint insulation.
- 3
Check 3
Ensure burner flame completely engulfs tip of flame sensor.
- 4
Check 4
Replace flame sensor.
Replacement part reference
Furnace Flame Sensor
Exact OEM part number
Model number required
Fitment note
The exact OEM part number varies by model and production revision. Verify the complete model number before ordering.
Verify the appliance model before ordering.
Manufacturers can use different parts under the same error code across model families and production revisions.
Where do I find my model number? →FixCodeDB may earn a commission from qualifying purchases made through affiliate links.
Common questions
Quick answers for this fault
What should I check first for E2?
Start with carbon buildup on flame sensor rod. If that checks out, continue through the diagnostic sequence above rather than replacing a part based on the code alone.
Does E2 always mean Furnace Flame Sensor is bad?
No. An error code identifies the condition the control detected, not a guaranteed failed part. Confirm the likely causes and wiring first. The exact OEM part number varies by model and production revision. Verify the complete model number before ordering.
When should I stop troubleshooting E2 myself?
Stop if the next step requires live electrical testing, sealed-system work, gas or combustion service, or any procedure outside your training. Unplug the appliance before removing panels or testing internal components. Do not bypass safety switches or live-test high-voltage, gas, refrigerant, or combustion components unless you are qualified to do so.
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