Amana AMVM970803BN Error Code EE8: High Stage Pressure Switch Closed at Start

What Does Code EE8 Mean?

Code EE8 means the high-stage pressure switch was closed when the control module expected it to be open at the start of the heating cycle. Because the module cannot verify high-stage draft safely, it blocks high-fire operation — but the furnace can still run normally on low stage, which is why this is a low-severity code.

On this modulating furnace, separate pressure switches monitor low- and high-stage draft. EE8 is the high-stage switch stuck closed, typically from sticking contacts or a short in the switch wiring.

EE8 is the high-stage counterpart of EE1 (low-stage switch closed at start). It is the opposite of EE9 (high-stage switch that fails to close). Naming them precisely matters: EE8 is a high-stage switch stuck closed, which limits the furnace to low stage rather than shutting it down.

What You'll Notice

• The furnace runs but never reaches high stage, with EE8 displayed
• Heat output feels limited on very cold days when high-fire is needed
• Low-stage operation is normal
• The fault appears at the start of the heating cycle

Common Causes

How This Is Diagnosed

A technician checks the high-stage pressure switch for contacts stuck closed and inspects the switch circuit wiring for a short that would hold the circuit closed. The switch is tested for correct open/close behavior.

If the contacts stick, the high-stage switch is replaced; if the wiring is shorted, it is repaired. The furnace remains usable on low stage while this is scheduled.

When to Call a Professional

This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:

• The furnace will not reach high stage on cold days and shows EE8
• Heat output feels insufficient during the coldest weather
• You want full high-fire capacity restored

✓ Verified against manufacturer service manual — March 2026