e3.1
Shorted Pressure Switch, 1st Stage
This code typically points to
- 1st-stage pressure switch shorted/stuck closed
Next checks to confirm
- Verify switch state before inducer starts
- If PS1 does not close within 60 seconds, control reports e3.1 and increases inducer to high speed to try to close PS1
Escalation
Inducer speed-up retry attempt
Reset behavior
Clears when pressure-switch state normalizes.
Urgent
Fix now