On the covered Goodman gas furnace, EE1 means the low-stage pressure switch circuit is closed at the start of the heating cycle. Goodman lists the low-stage pressure switch contacts sticking and a short in the pressure-switch circuit wiring. First, note whether the inducer starts before you see the code.
Differential
Likely causes of “Goodman gas furnace code EE1”, and how to tell them apart
- 1
Low-stage pressure switch contacts that stick closed
What separates it The code appears as the call for heat starts, before the inducer has had time to build draft
How to confirm A technician checks that the switch is open with the inducer off; Goodman lists a sticking switch
- 2
A short in the pressure-switch wiring
What separates it The control sees the circuit closed regardless of the switch
How to confirm With power off, a technician looks for pinched or chafed insulation along the harness
- 3
A switch or hose connected to the wrong port
What separates it The code starts after a repair or part swap
How to confirm Compare the hose and wire positions against the unit's wiring diagram
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether the inducer motor starts before the code shows
- Whether the code came after a repair
- The furnace model and the date of manufacture on the label
- How many times the furnace restarts before it locks out
Try in this order
0 of 5 completedWhat to do first
ReversibleNote whether the inducer starts before you see the code.
Correct only the documented fault domain
ReversibleGoodman says to replace the low-stage pressure switch and repair any short in the wiring. Never jumper a pressure switch.
Watch the start of one heating cycle
ReversibleFrom the thermostat, call for heat and note the order: inducer, then pressure-switch proving, then igniter. The code at the very start points at the switch circuit rather than the vent.
Power the furnace off at the switch
ReversibleBefore any panel comes off, turn the furnace power switch off. A technician should handle the harness and the switch.
Replace the switch and repair the wiring
ReversibleGoodman's corrective action is to replace the low-stage pressure switch and repair any short in the wiring that reaches it.
Model-specific
What is true of this model and not of its siblings
- Shown as
- EE1 on the control's display or flash code.
- Applies to
- Goodman two-stage furnaces such as the GM9C96 and GC9C96 family.
Stop boundary
When this stops being a self-service repair
- !Never jumper a pressure switch to get heat; it removes the draft proof the burner relies on
- !Call a gas furnace technician; the switch and wiring sit behind the burner access panel
Evidence ledger
Sources behind this answer
Exact questions
Common questions
What does EE1 mean on a Goodman gas furnace?+
The low-stage pressure switch circuit is closed at the start of the heating cycle. Goodman lists the low-stage pressure switch contacts sticking and a short in the pressure-switch circuit wiring.
Can I bypass the switch?+
No. Goodman says to replace the switch; bypassing it defeats the check that the vent is drawing.
Is it a vent blockage?+
A blocked vent usually keeps a switch open, not closed. A closed reading at the start points at the switch or its wiring.