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Error code reference
Lennox Furnace Error Code DS1 Slow Flash / DS2 OFF
Flame sensed without gas valve energized. (G32V-5 units)
SourceLennox G32V Series Furnace - Service ManualTable 21, Page 25
Diagnostic procedure
The full DS1 Slow Flash / DS2 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
Check flame sensor and gas valve wiring.
SourceLennox G32V Series Furnace - Service ManualTable 21, Page 25
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
3 manuals in the MyPros+ library document this code for Lennox furnace.
Models covered by the manuals that document this code
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