Switch #1 — Exterior (All Models)
Switch #1 — Exterior (All Models) Located on the back of the generator cabinet, just below the roof line near the electrical connections. Small black button or knob. Must be in the ON / "I" position.
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Generac
Auxiliary Shutdown
An emergency stop (E-stop) switch was activated or left in the OFF position.
Code
2800
Need service now? Skip the troubleshooting — open a service ticket and we'll handle it.
âš SAFETY FIRST: Always follow lock-out/tag-out procedures before inspecting wiring. Never clear an alarm without first correcting the root cause.
Overview
What 2800 means
An emergency stop (E-stop) switch was activated or left in the OFF position.
E-stop switch left in OFF position after maintenance
Accidental bump flipping a switch to OPEN
Dirty, corroded, or damaged switch contacts
Loose or broken wiring in the safety circuit
Switch locations
Know where to inspect first
Switch #2 — Interior (15 kW+ Units Only)
Switch #2 — Interior (15 kW+ Units Only) Located inside the control access panel on the black firewall panel, upper right corner. Units 14 kW and under typically have only 1 switch.
Step-by-step workflow
Follow the diagnostic and reset sequence
1
Verify the Error Code
CheckConfirm the controller is displaying Error Code 2800 (Auxiliary Shutdown). On Evolution/Nexus controllers this appears on the digital display. Check the Generac Mobile Link app if connected — it will log the fault with a timestamp.
2
Set Controller to OFF
ActionOpen the generator's control access panel. Locate the Manual / Auto / Off selector on the controller and press OFF before touching any switches or wiring.
Why: Placing the unit in OFF prevents the generator from auto-starting while you inspect and reset components. Finding the OFF button: On the Evolution controller, OFF is the red button marked with a circle (â˜) in the bottom row. On a Nexus controller, press the button to the center position labeled OFF. Evolution Controller Nexus Controller
3
Inspect All Auxiliary E-Stop Switches
CheckLocate each E-stop switch on your unit. Verify each is in the ON position (marked "I"). An open or "O" position will trigger Error 2800.
Visual inspection checklist: ✓ Switch knob or button is in the "I" / ON position ✓ No visible physical damage to switch housing ✓ No corrosion, dirt, or debris on switch contacts ✓ Wiring connections at switch terminals are tight and secure
4
Cycle Each Switch OFF Then Back ON
ActionEven if switches appear to be in the ON position, cycle each one: press to OFF, wait 3 seconds, then press back to ON. This clears any contact contamination or borderline open circuits that may not be visible to the eye.
5
Clear the Fault Code on the Controller
ResetOn the controller keypad, navigate to the alarm/fault screen. Press ENTER (or OFF then ENTER depending on controller version) to clear the active fault code. The display should confirm the alarm has cleared.
Evolution Controller: Menu → Faults → Enter to clear. Nexus Controller: Off → Enter to clear fault → verify no alarm remains.
6
Return to AUTO and Test
ResetPress the controller back to AUTO. The unit should return to standby mode within 10 seconds, indicated by a steady green light. Confirm status in the Mobile Link app — status should read "Ready to Run."
âš¡ Success indicator: Green ready light on, no fault codes displayed, Mobile Link shows "Ready to Run."
After reset
Did the code clear?
Yes — code cleared
The code cleared and the unit returned to standby. Log the incident, confirm ready-to-run status, and monitor the next exercise cycle.
No — code returned
If the code returns immediately, stop resetting and move into service. The issue likely needs inspection of wiring, switches, or a controller-level component.
Prevention
Best practices and next checks
Post-Maintenance Check
Always confirm all E-stop switches are in the ON position after any service, inspection, or cleaning of the generator.
Get a Maintenance Plan
Get a Maintenance Plan from A&A Power Generators and let us handle your preventative maintenance needs.
Maintenance Log Entry
Add an E-stop switch check to your routine 6-month maintenance checklist and after any storm-related generator operation.
Enable Mobile Link Alerts
Register your generator on the Generac Mobile Link app to receive instant fault notifications before a power outage occurs.
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Still need help?
A&A Power can take it from here.
If the issue persists after following the workflow, route the unit into ticket, appointment, or consultation support so the team can take over with the right service path.
