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Error code reference
Lennox Furnace Error Code E275
Heat rate reduced to match indoor blower air flow; replace filter or repair duct restriction.
SourceLennox SLP98DFV - Service Manual: High-Efficiency Gas Furnacep. 20
Diagnostic procedure
The full E275 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
Furnace blower in cutback mode due to restricted airflow. Check filter and ductwork. Replace filter if needed or repair/add ductwork.
SourceLennox SLP98DFV - Service Manual: High-Efficiency Gas Furnacep. 20
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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