Goodman GMVC960803BN Error Code EE1: Low Stage Pressure Switch Stuck Closed
What Does Code EE1 Mean?
Error code EE1 on the Goodman GMVC960803BN indicates that the low-stage pressure switch circuit was closed at the start of a heating cycle. The pressure switch is a safety device that normally opens when the inducer is off and closes only after the inducer creates sufficient negative pressure in the flue. If it is already closed before the inducer starts, the control module interprets this as a fault and will not allow the furnace to run.
A stuck or welded pressure switch — where the switch contacts have fused in the closed position — is the most common mechanical cause. Shorts in the pressure switch wiring can also cause the circuit to appear closed when it should not be. The control module will not attempt to start the inducer or ignition sequence until this condition is corrected.
A technician will test the pressure switch continuity with a multimeter while the inducer is off to confirm whether the switch contacts are sticking. If the switch is confirmed faulty, it must be replaced. If the switch tests normally, the wiring harness between the switch and the control board must be inspected for shorts.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Low stage pressure switch contacts sticking closed | Most common | ✗ Call a pro → |
| Short in pressure switch circuit wiring | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- EE1 is present at startup — a technician must test the pressure switch continuity and inspect the wiring before the furnace can be operated
- Replacing the pressure switch does not clear the fault — the wiring harness requires further inspection for shorts
✓ Verified against manufacturer service manual — March 2026