What this code means
The American Standard S9V2 furnace service manual identifies E7.1 as first-stage gas valve energized when it should be off.
Safe checks
- Confirm the thermostat is on, set correctly, and calling for heating or cooling.
- Check the air filter and visible return-air path for obvious airflow restrictions.
- Record the displayed code or flash sequence before scheduling service.
First step
Record the code, check the thermostat and filter, and schedule service if the condition remains.
Frequently asked questions
What does E7.1 mean on a American Standard S9V2B060U4PSC?
The American Standard S9V2 furnace service manual identifies E7.1 as first-stage gas valve energized when it should be off.
What should I safely check before scheduling service?
Use only the visible, non-invasive checks listed on this page. Do not open equipment panels.
When should GreenFlow handle this code?
Call GreenFlow if the code repeats, the equipment is locked out, heating or cooling is not restored, or the condition involves gas, ignition, pressure, wiring, a motor, or a control board.