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Error code reference
Lennox Furnace Error Code LED-OFF
Control failure or power failure or hard lockout (G776 ignition control, -1 and -2 models).
SourceLennox G26 Series Furnace - Service Manualp. 16
Diagnostic procedure
The full LED-OFF procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
If power and gas supply are OK, try removing thermostat demand for at least 30 seconds. If LED remains off when demand is returned, replace control.
SourceLennox G26 Series Furnace - Service Manualp. 16
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented
7 manuals in the MyPros+ library document this code for Lennox furnace.
Models covered by the manuals that document this code
- G23Q2(X)-50
- G23Q2/3(X)-75
- G23Q3(X)-100
- G23Q3(X)-50
- G23Q3/4(X)-100
- G23Q3/4(X)-125
- G23Q4/5(X)-100
- G23Q4/5(X)-75
- G23Q5/6(X)-125
- G23Q5/6(X)-150
- G26
- G26-1
- G26-2
- G26-3
- G26-4
- G26-5
- G26-6
- G26Q2-50
- G26Q3-50
- G26Q3-75
- G26Q4/5-75
- ML180DF045P24A
- ML180DF045P36A
- ML180DF070P36A
More models are covered than are listed here.
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