Goodman GMVC960803BN Error Code EE9: High Stage Pressure Switch Open
What Does Code EE9 Mean?
Error code EE9 on the Goodman GMVC960803BN means the high-stage pressure switch failed to close during a high-stage call for heat. The induced draft blower is running and low-stage operation continues normally, but the furnace cannot verify enough high-stage draft to move up to full output, so it stays on low stage. Like EE8, this is a partial-heat condition rather than a total shutdown, which is why it carries a low severity — but it means long run times and a home that may not reach setpoint when it is very cold outside.
On this two-stage, variable-speed 96% AFUE furnace the high-stage pressure switch is designed to close only once the inducer reaches high speed and pulls a strong negative draft through the flue. EE9 is the mirror image of EE8: where EE8 faults the high-stage switch for being stuck closed before the cycle, EE9 faults it for failing to close when it should. EE9 is also the high-stage version of EE2 — the same won't-close venting fault, but on the high-stage switch, so it limits the furnace to low stage instead of stopping it completely.
The causes are the same venting family that produces EE2, just evaluated at the higher draft required for high stage: a blocked or kinked pressure switch hose, a partially blocked flue or inlet-air pipe, a clogged condensate drain, or an induced draft blower too weak to reach high-stage RPM. If the mechanical draft is adequate, the switch itself may have the wrong set point, a failed diaphragm, or loose wiring.
What You'll Notice
- The furnace runs but never steps up to full heat, even on the coldest days
- Long run times and weak heat because the furnace is limited to low stage
- The 7-segment diagnostic display reads EE9
- The home does not reach the thermostat setpoint during very cold weather
- Low-stage heating otherwise operates normally
Common Causes
How This Is Diagnosed
A technician evaluates the high-stage draft path first, since a venting restriction is the common cause: they inspect the pressure switch hose for kinks, cracks, or water, check the flue and intake terminations for partial blockage, and verify the condensate drain and trap are clear. Anything reducing draft at high stage is corrected.
If the venting is clear, the technician measures the actual draft pressure at the high-stage switch with a manometer while the inducer runs at high speed and compares it to the switch's set point. That reveals whether the inducer cannot produce enough draft or whether the switch (or its wiring) fails to close under adequate pressure, and the failed part is replaced.
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 is stuck on low heat and will not step up to high stage, with EE9 displayed
- The pressure switch hose is intact but the high-stage switch still will not close
- The flue, intake, and condensate drain are confirmed clear yet EE9 persists
- The induced draft blower runs slowly or makes unusual noise and cannot reach high speed
Frequently Asked Questions
Why does my furnace still heat but never feel like it is at full power?
EE9 blocks only high-stage operation, so the furnace keeps running on low stage and delivers reduced output. On mild days you may not notice, but on very cold days the furnace cannot step up to the capacity it needs, so the home may fall short of the setpoint and run times get long.
How is EE9 different from EE2?
They are the same type of won't-close pressure switch fault, but on different switches. EE2 is the low-stage switch failing to close, which stops the furnace entirely. EE9 is the high-stage switch failing to close, which only demotes the furnace to low stage. EE9 is therefore less urgent but still worth fixing before deep cold.
What does repairing EE9 typically cost?
If the cause is a blocked hose, flue, or drain, the repair may be mostly labor. If the pressure switch or induced draft blower needs replacement, parts add to the cost. Pricing varies by region and by the actual cause, so get an estimate from your technician after diagnosis.
✓ Verified against manufacturer service manual — March 2026