Quick diagnosis
What this code is telling you
Most likely trigger
Soiled or oxidized flame sensor
Recommended replacement
Furnace Flame Sensor Rod
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 soiled or oxidized flame sensor first, then verify disconnected ground wire and low gas supply pressure before replacing furnace Flame Sensor Rod.
Symptoms
What you may notice
- ✓Burners light briefly then go out
- ✓Igniter glows repeatedly without establishing sustained flame
- ✓LED blinks 1 short, 4 long flashes
Possible causes
Check the most likely causes first
- 1
Soiled or oxidized flame sensor
Start here when it matches your symptoms.
- 2
Disconnected ground wire
- 3
Low gas supply pressure
- 4
Defective spark module / igniter
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
Clean flame sensor rod with fine steel wool.
- 2
Check 2
Check cabinet ground wire connection for tight contact.
- 3
Check 3
Disconnect electrical power before opening panels. Verify gas valve is turned completely on.
- 4
Check 4
Replace flame sensor rod.
Replacement part reference
Furnace Flame Sensor Rod
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 14?
Start with soiled or oxidized flame sensor. If that checks out, continue through the diagnostic sequence above rather than replacing a part based on the code alone.
Does 14 always mean Furnace Flame Sensor Rod 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 14 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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