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Error code reference
Lennox Furnace Error Code E228
Unable to perform successful pressure switch calibration.
SourceLennox SLP98DFV - Service Manual: High-Efficiency Gas Furnacep. 19
Diagnostic procedure
The full E228 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
Retry after 300 seconds. Check vent system and pressure switch wiring connections.
SourceLennox SLP98DFV - Service Manual: High-Efficiency Gas Furnacep. 19
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
2 manuals in the MyPros+ library document this code for Lennox furnace.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
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