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Error code reference
Lennox Furnace Error Code E 250
Limit switch circuit open.
SourceLennox SLP98DFV - Service Manual: High-Efficiency Gas Furnacep. 19
Diagnostic procedure
The full E 250 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 for proper firing rate on furnace. Ensure there is no blockage in heater. Check for proper air flow. If limit not closed within 3 minutes, unit will go into 1-hour soft lockout. Resumes normal operation after fault is cleared.
SourceLennox EL296UHE - Service Manual: High-Efficiency Gas Furnacep. 12
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
4 manuals in the MyPros+ library document this code for Lennox furnace.
Models covered by the manuals that document this code
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