HVACopediaGoodman · Furnace
EE1 Pressure switch closed at start of heating cycle
What the control is telling you
At the start of a heat call the (low-stage) pressure switch circuit is already closed before the inducer runs. The control will not start the ignition sequence. Flowcharts call this code E1.
Applies to: Goodman/Amana/GMC gas furnaces, 9-speed ECM, 7-segment control. Two-stage 96%: AC9C96, AM9C96, GC9C96, GM9C96. Single stage 80%: VC9S80, VM9S80, AC9S80, AM9S80, GC9S80, GM9S80. Single stage 92/96%: VC9S96, VM9S96, AC9S96, AM9S96, AM9S92, GC9S96, GM9S96, GM9S92
Likely causes
- Pressure switch contacts stuck closed
- Short in the pressure switch circuit wiring (to another wire or to ground)
Test and repair steps
- Turn off power, remove the wires from the pressure switch and check the contacts with an ohmmeter while the inducer is off - they must be open.
- If the contacts read closed with no vacuum applied, replace the pressure switch (on two-stage furnaces this is the low-stage switch).
- If the switch is open, trace the pressure switch circuit wiring for a short to another wire or to ground and repair it.
- Reconnect, cycle the thermostat and confirm the code clears.
Settings for these units
Normal status displays (7-segment) · Goodman/Amana GM9S96/AM9S96
| Mode | Display |
|---|---|
| Idle | IdL |
| Continuous fan | FAn |
| Cooling, low stage | 1AC |
| Cooling, high stage | 2AC |
| Gas heat (single stage) | gH |
| Factory (OEM) test mode | EOL |
These are normal operating displays, not fault codes.
Normal status displays (7-segment) · Goodman/Amana GM9S80/AM9S80
| Mode | Display |
|---|---|
| Idle | IdL |
| Continuous fan | FAn |
| Cooling, low stage | 1AC |
| Cooling, high stage | 2AC |
| Gas heat (single stage) | gH |
| Factory (OEM) test mode | EOL |
These are normal operating displays, not fault codes.
- Normal status displays (7-segment) · Goodman/Amana GM9C96/AM9C96
- Minimum recommended filter size · Goodman/Amana GM9C96/AM9C96
Models that show this code
80 models in Goodman/Amana GM9S96/AM9S96, Goodman/Amana GM9S80/AM9S80, Goodman/Amana GM9C96/AM9C96
Other codes on the same units
- E10 Grounding fault / poor neutral connection
- E11 Flame rollout switch open
- EE0 Lockout - too many ignition retries (3)
- EE2 Pressure switch did not close (inducer runs, no ignition)
- EE3 High (primary) limit open
- EE4 Flame sensed with no call for heat
- EE5 Open fuse (short in low voltage wiring)
- EE6 Low flame signal
Save it for the next call
Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.
Source: Goodman RS6612022r1 (GM9S92/GM9S96/GC9S96 service), 1 Stage Troubleshooting Codes, p.29-30; Goodman RS6621008r2 (GM9S80 service), p.32-33; Goodman RS6612020r1 (GM9C96 service), 2 Stage Troubleshooting Codes, p.35-36; Error Code E1, E2 flowchart p.52 (RS6612022r1), p.37 (RS6621008r2), p.40 (RS6612020r1). Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.