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Generac

Overcrank

Engine failed to start after multiple crank attempts. Usually fuel pressure, air in lines, or weak battery.

Code 1100 / 1101
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Overcrank

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Safety first

âš  SAFETY FIRST: Disconnect battery (negative lead first) before inspecting internal components. Never work on a generator that may auto-start.

Overview

What 1100 / 1101 means

Engine failed to start after multiple crank attempts. Usually fuel pressure, air in lines, or weak battery.

Insufficient fuel pressure or empty fuel tank / propane tank

Air in the fuel lines (especially after a new tank fill or long storage)

Weak or dead 12V battery unable to crank at sufficient speed

Faulty fuel regulator or stuck fuel solenoid valve

Clogged fuel filter or carburetor

Spark plug failure or fouled plugs

Low engine compression

Flooded engine (too many start attempts)

Step-by-step workflow

Follow the diagnostic and reset sequence

1

Check Fuel Supply

CHECK

Verify the fuel source. For natural gas, confirm supply is on at the meter and manual shutoffs are open. For propane, check tank level (must be above 20%). Low propane pressure is the single most common cause of Overcrank.

Natural gas: Call your utility to confirm adequate pressure at the meter. Propane: Tank should be at least 20–25% full. Cold weather causes pressure drops — a full tank is recommended heading into winter. Confirm all inline manual shutoff valves between the tank and generator are fully OPEN.
2

Check Battery Voltage

CHECK

A battery below ~11V cannot crank the engine fast enough for ignition. Test with a multimeter.

12.6V+ = Healthy. 12.0–12.5V = Charge and retest. Below 11.5V = Replace. Battery older than 4–5 years = Replace regardless of voltage reading.
3

Inspect Fuel Lines & Solenoid

ACTION

After a long shutdown or new propane delivery, air can enter the fuel lines. The fuel solenoid valve must open when a start is commanded — a stuck or faulty solenoid will prevent fuel from reaching the engine.

Listen for a click from the fuel solenoid when you initiate a start attempt. No click = solenoid may be faulty. For air-in-lines: attempt 2–3 manual start cycles to purge — allow 2 minutes between each attempt.
4

Inspect Spark Plugs

ACTION

Fouled or failed spark plugs prevent ignition. If the engine cranks freely but never fires, spark plugs are a common culprit — especially on units with 200+ hours or 2+ years of service.

Remove and visually inspect plugs. Look for: heavy carbon fouling, cracked insulator, worn electrode. Replace both plugs if in doubt. Correct gap per engine spec (typically 0.030 inches).
5

Clear the Overcrank Fault

RESET

After correcting the root cause, clear the alarm from the controller before attempting another start.

Evolution Controller: Press OFF/Reset. Navigate to Faults if needed and press Enter to clear. Nexus Controller: Press OFF → Enter to clear. Alternative: Pull all controller fuses, wait 10 seconds, reinstall to hard-reset.
Evolution Controller
Evolution Controller
Nexus Controller
Nexus Controller
6

Attempt Restart & Monitor

RESET

Return the controller to AUTO. The unit will attempt to start on the next power outage or manual test. If it overcranks again immediately, escalate to professional service.

If alarm returns: Do not continue clearing and retrying — contact A&A Power Generators. Repeated overcrank attempts with no resolution can damage the starter motor and flywheel ring gear.

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.

Open a Service Ticket

Need direct help?

Move from troubleshooting into the right support path.

Use the same workflow page to open a ticket, book service, or route into a broader consultation if the issue needs parts, diagnostics, or scheduling.

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Prevention

Best practices and next checks

Maintain Fuel Level

Keep propane tank above 25% at all times. Schedule auto-delivery with your propane supplier. For natural gas, test pressure annually.

Replace Battery Every 3–5 Years

A weak battery cannot crank fast enough for ignition — especially in cold weather when oil is thicker.

Annual Tune-Up

Replace spark plugs, air filter, and fuel filter annually or per Generac's service interval. Inspect fuel solenoid operation.

Get a Maintenance Plan

Let A&A Power Generators handle your preventative maintenance. +1-888-991-6933

Enable Mobile Link Alerts

Receive instant fault notifications via the Generac Mobile Link app before a real outage occurs.

Exercise Run Monitoring

Review your weekly exercise run log. A generator that struggles to start during exercise will fail during an outage.

Get a Maintenance Plan

Let A&A Power Generators handle all preventative maintenance for your generator.

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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.

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