Error code reference
Ingersoll Rand Furnace Error Code E3.3
Shorted pressure switch, 2nd stage (pressure switch is closed when it should be open).
Shorted pressure switch, 2nd stage (pressure switch is closed when it should be open).
First step from the service manual
Cycle power OFF then ON, verify PS2 orientation is correct, measure 24V across PS2 (brown to yellow).
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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