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Error code reference
Ingersoll Rand Furnace Error Code E3.1
Shorted pressure switch, 1st stage (pressure switch is closed when it should be open).
SourceIngersoll Rand S9V2 Furnace - Service Facts: Gas-Fired Condensingp. 54, 59, 66
Diagnostic procedure
The full E3.1 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
Verify PS1 is oriented correctly for the application, then cycle power and call for 1st stage heat; measure 24V across PS1 (orange to yellow).
SourceIngersoll Rand S9V2 Furnace - Service Facts: Gas-Fired Condensingp. 54, 59, 66
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
1 manual in the MyPros+ library documents this code for Ingersoll Rand furnace.
Models covered by the manuals that document this code
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