Amana AMVC960803BN Error Code EE8: High Stage Pressure Switch Stuck Closed
What Does Code EE8 Mean?
Error code EE8 on the Amana AMVC960803BN means the high-stage pressure switch circuit was already closed when a heating cycle began, before the induced draft blower reached high-stage speed. This two-stage furnace uses a separate high-stage pressure switch that should only close when the inducer is running at high speed and creating sufficient negative draft. If the switch is already closed at startup, the control module records it as a fault.
The furnace will continue to operate on low stage only, providing reduced heat output. The induced draft blower runs normally, and the low-stage pressure switch operates correctly. Only high-stage operation is blocked.
Stuck switch contacts — where the contact surfaces have welded or fused together — are the most common cause. A short circuit in the high-stage pressure switch wiring that creates a continuous circuit path can produce the same fault. A technician will use a multimeter to test the switch continuity while the inducer is off; if the switch shows continuity when it should be open, it must be replaced.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| High stage pressure switch contacts sticking closed | Most common | ✗ Call a pro → |
| Short in high stage pressure switch wiring | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- EE8 is present and the furnace cannot reach high-stage capacity — a technician must test the high-stage pressure switch and replace it if faulty
- Replacing the switch does not clear the fault — the wiring must be inspected for shorts between the switch terminals
Sources
✓ Verified against manufacturer service manual — March 2026