Amana Furnace Code EE9
Warning
High-stage pressure switch never closed, so the furnace will not go to high fire. It usually keeps heating on low stage, which feels underpowered in cold weather.
Manual wording: “High-stage pressure switch circuit open.”
Documented for: Amana AMVC96, ACVC96, AMVM97, ACVM97, AM9S80, AC9S80, AR9S80, AD9S80, AR9T96, AD9T96 (seven-segment display controls)
Likely causes, most common first
- Pressure switch hose blocked, pinched, or connected improperly
- Blocked flue pipe and/or inlet air pipe, blocked drain system or weak induced draft blower
- Incorrect pressure switch set point or malfunctioning switch contacts
- Loose or improperly connected wiring
What you can safely check yourself
- Check the outdoor intake and exhaust pipes for snow, ice or debris
- Check the condensate drain line and trap for a clog
When to call a technician
If the venting and drain are clear, the high-stage pressure switch and inducer need a technician.
A Amana furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- *R9T96 & *D9T96 Two-Stage Gas Furnaces (Type FSP Category IV) - IOG-2038E (Daikin Comfort Technologies (Amana brand), Amana AR9T96, AD9T96 two-stage 96% AFUE gas furnaces (current R-32 era production)) · checked 2026-08-25
- Installation Instructions for *CVC96* & *MVC96* Two-Stage Gas Furnace - IOG-2015L (Daikin Comfort Technologies (Amana brand), Amana AMVC96, ACVC96 two-stage variable-speed 96% AFUE gas furnaces) · checked 2026-08-25