Lennox Furnace Error Code DS1/DS2 Alternating Slow Flash
Watchguard - burners failed to ignite, or limit open more than 3 minutes, or lost flame sense 5 times in one heating cycle, or pressure switch opened 5 times in one heating cycle.
SourceLennox G60UH Series - Service Manual (Mid-Efficiency Gas Furnace)p. 15
The full DS1/DS2 Alternating Slow Flash 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.
SourceLennox G60UH Series - Service Manual (Mid-Efficiency Gas Furnace)p. 15
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Where this code is documented
1 manual in the MyPros+ library documents this code for Lennox furnace.
Models covered by the manuals that document this code
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