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Won't Start

Generac Standby Generator

Severity: Critical

Source: OnlyErrorCodes.com — Every error code. One place.

Generac Generator Won't Start — Causes & Fixes

What Does This Error Mean?

When a Generac generator won't start, check the control panel for alarm codes first. Then verify fuel supply, battery voltage, oil level, and air filter in that order.

How to Fix It

  1. Check the control panel for alarm codes

  2. Confirm the fuel supply

  3. Check the battery

  4. Check the oil level

  5. Check the main circuit breaker

  6. Test in MANUAL mode

  7. Check the air filter

Frequently Asked Questions

Why won't my Generac start after a power outage?

If the generator worked on the last exercise cycle but fails during a real outage, check that the automatic transfer switch (ATS) is sending the start signal. A faulty ATS is a common failure point.

My Generac cranks but won't fire — what is wrong?

If the starter turns the engine but it won't ignite, suspect fuel delivery (gas pressure, carburetor varnish on propane models) or a fouled spark plug. Also check the choke closes on cold starts.

How do I manually test my Generac generator?

Use the TEST button on the control panel to run a manual exercise cycle, or switch to MANUAL mode and press START. Run for at least 20 minutes under load at least once a month.