Skip to main content
Error code reference
Lennox Furnace Error Code 1+2
Low flame current during run mode (Board 100869).
SourceLennox G61MP Series - Service Manual: Gas Furnacep. 15
Diagnostic procedure
The full 1+2 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 sense rod for proper location and contamination; clean with steel wool or replace.
SourceLennox G61MP Series - Service Manual: Gas Furnacep. 15
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock 1+2 procedure $9.95
Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.
Where this code is documented
9 manuals in the MyPros+ library document this code for Lennox furnace.
Models covered by the manuals that document this code
- C33-18A-2F
- C33-24A-2F
- C33-30A-2F
- C33-36A-2F
- EL180DF045E36A
- EL180DF070E36B
- EL180DF090E48B
- EL180DF110E60C
- EL180DFE
- EL180UH045E36A
- EL180UH045XE36A
- EL180UH070E36B
- EL180UH070XE36B
- EL180UH090E60C
- EL180UH110E60C
- EL180UH110XE60C
- EL180UHE(X)
- EL280UH070P24A
- EL280UH070P36A
- EL280UH070XP36A
- EL280UH090P36B
- G60UH-1
- G60UH-24A-045
- G60UH-24A-045X
More models are covered than are listed here.
75,000+ service documents · 20,000+ error codes · 100+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax