When an inverter generator runs but its outlets are dead, unplug every appliance, shut the generator down, restart it with no load, and plug one known-working low-wattage appliance directly into an outlet. Next, reset the circuit breakers, the GFCI receptacles, and any model-specific overload or inverter controls. If output still does not return, or a protection device trips with nothing connected, stop troubleshooting and follow the manufacturer’s service procedure.
Most no-output problems come from a protection device doing its job: a tripped breaker, a tripped GFCI, or an overload shutdown that cuts electrical output while the engine keeps running. This guide shows how to separate those resettable faults from a real internal failure. It also explains which checks are safe for owners and when a generator powering your essentials needs warranty or technician attention.
Quick answer
Disconnect all loads, stop the generator, restart it unloaded, and test one outlet with a small appliance plugged in directly, with no extension cord. Reset the breakers, GFCI, and overload or inverter controls exactly as your owner’s manual describes. If a breaker or GFCI trips with nothing plugged in, or output never returns, contact an authorized service center.
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Why is my inverter generator running but producing no electricity?
The usual reason is that a protection device has shut off AC output while the engine keeps running. Cat’s guidance on an engine running with no power notes that some inverter generators keep the engine going during an overload condition while electrical output stays off.
Tripped circuit breaker: An overload or a short circuit trips the breaker, which cuts power to the outlets to protect the generator. Resetting it on the control panel often restores output.
Overload shutdown: Too many devices drawing power at once, or several motors starting together, can trigger the inverter’s overload protection. Output stays off until you reset the generator as your manual describes.
Tripped GFCI receptacle: A ground fault in a cord or appliance can trip the GFCI outlet. That outlet goes dead while other outlets may still work.
Faulty appliance or cord: A damaged extension cord or a broken appliance can look exactly like a generator with no output.
Loss of residual magnetism: This affects conventional brushed generators, which rely on leftover magnetism in the alternator to start producing voltage. Most inverter generators use a permanent-magnet alternator, so this cause rarely applies to them. Check your model’s documentation before assuming it does.
Internal fault: A failed inverter module, control board, alternator winding, or internal wiring can stop output entirely. Owners should not repair these.
| Symptom | What it usually points to | What to check |
|---|---|---|
| Engine running, overload light on | Overload shutdown | Remove all loads, then perform the model’s overload reset |
| Breaker handle in the middle or OFF position | Tripped breaker | Move it fully to OFF, then ON, or press the reset button |
| One outlet dead, GFCI button popped out | Ground fault on that receptacle | Unplug cords and appliances, then press RESET |
| GFCI or breaker trips again with nothing plugged in | Fault inside the generator | Stop and contact service |
| USB/DC ports work, AC outlets dead | AC protection tripped, or an AC-side fault | Reset the AC breaker and overload; if output does not return, contact service |
| USB/DC and AC all dead, no warning lights | Control panel or inverter fault | Inspect for visible damage, then contact service |
| AC works at the panel but not at the device | Extension cord or appliance | Swap the cord, then test a different appliance |
What is the safe five-minute checklist?
- Disconnect loads: Unplug every appliance, extension cord, and transfer-switch connection.
- Stop and cool down: Turn the generator off and let it sit for a few minutes. While it cools, look for loose cables, visible damage, and low fluid levels. Cat recommends this basic inspection before deeper troubleshooting.
- Restart unloaded: Start the engine with nothing connected and check the output-ready and warning lights.
- Reset protection: Reset the breakers, the GFCI, and the overload or inverter controls as described below.
- Test directly: Plug a small appliance you know works, such as a lamp or phone charger, straight into the generator.
- Reconnect one at a time: Add loads one by one, starting with the largest motor load. Give each one time to start before adding the next.
How do I reset an inverter generator after an overload?
Remove every load, then follow your model’s reset procedure. On many models that means turning the control knob or engine switch to OFF and letting the engine stop completely. Cat notes that certain models need the engine stopped for several seconds before you restart, and output returns only after that restart. Other models use a dedicated reset button. Generac’s no-power support article states that overload, inverter, and reset procedures vary by model, so the owner’s manual is the authority.
Where are the circuit breakers and GFCI reset buttons?
Both are usually on the main control panel, next to the outlets. Breakers may be toggle switches or push-to-reset buttons, sometimes one per outlet group. GFCI reset buttons sit on the face of the receptacle itself, between the two sockets. Generac advises moving a toggle breaker fully to OFF before switching it back ON, or pressing a push-button breaker until it latches.
Why will the GFCI not reset on my generator?
A GFCI usually refuses to reset because a ground fault is still present or the receptacle has failed. Unplug all cords and appliances and press RESET again. Generac’s guidance is clear: if the GFCI keeps tripping with no load connected, stop troubleshooting that circuit. A fault inside the generator or a failed receptacle needs service. Moisture can also cause nuisance trips, so let a wet unit dry under cover before trying again.
Should I test the generator with Eco mode turned off?
Yes. Turn Eco mode off for diagnosis. Eco mode lowers engine speed at light loads, and a sudden large load can then trip overload protection before the engine speeds up. Testing with Eco off removes that variable. If the generator handles the load with Eco off but trips with it on, the generator is probably fine; leave Eco off for motor-driven appliances.
What does it mean if the overload light stays on while the engine runs?
It usually means output protection is still latched and the generator has not been reset correctly. Disconnect every load and perform the full shutdown-and-restart procedure. If the light stays on with nothing plugged in after a proper reset, the cause is likely an internal fault in the inverter or control electronics. Contact service.
Why does a 2,000-watt generator trip when my appliances add up to less?
Startup surges stack. The example below uses illustrative values; take real figures from your generator’s label and each appliance’s nameplate.
| Item (example values) | Running watts | Startup watts |
|---|---|---|
| Generator rating | 1,600 running | 2,000 starting |
| Refrigerator | 600 | 1,800 for a few seconds |
| Coffee maker | 900 | 900 |
| Total | 1,500 (below 1,600) | 900 + 1,800 = 2,700 (above 2,000) |
The running total looks safe. But when the refrigerator compressor cycles on while the coffee maker is heating, demand briefly reaches 2,700 watts and the inverter shuts off output. The fix is to stagger loads, so you avoid running a heating appliance while a compressor or pump might start.
Does flashing the field with a drill work on an inverter generator?
Usually not. Flashing restores residual magnetism in conventional brushed generators. The method is to plug a corded drill into the running generator, hold the trigger, and spin the chuck backward. Most inverter generators use permanent magnets, which do not lose magnetism this way. Only use this method if your manufacturer’s documentation describes it for your model.
How can I tell whether the appliance, extension cord, or generator is faulty?
Test at the generator first. Generac recommends plugging a small, known-working appliance directly into the generator, without an extension cord. If it works, the generator is producing power, and the problem lies downstream. Next, test the same appliance through the extension cord. If it fails only through the cord, replace the cord. If the original appliance fails at a working outlet, the appliance is at fault. Undersized or long cords can also cause voltage drop that makes motors stall and trip protection.
Can a failed inverter module, AVR, alternator, or control board cause zero output?
Yes, each can, but which parts your generator contains depends on its design. Component layouts vary by model, so treat the following as general background, not a repair guide.
Brushes: Brushed conventional generators use brushes to carry current to the rotor. Worn brushes break that connection. Most inverter generators have no brushes.
Automatic Voltage Regulator (AVR): Conventional generators use an AVR to control output voltage, and a faulty AVR can cause no power or unstable power. In inverter generators, the inverter module and control board handle voltage regulation, and a failure there can stop output entirely.
Alternator windings: Heat or age can burn out or break the windings, so the alternator can no longer generate electricity. This needs a repair or replacement.
Loose or corroded connections: Loose or corroded connections can stop power reaching the outlets. Owners can safely inspect external cables and plugs with the generator off. Leave internal connections to a technician.
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Which tools and tests are safe for owners?
A known-good appliance is the safest diagnostic tool. A multimeter is useful only when your manual permits outlet voltage checks. The drill-flashing technique applies to conventional brushed generators only; see the section above before trying it.
| Testing Voltage Output | Inspecting Wiring and Connections |
|---|---|
| If the manual allows it, use a multimeter set to AC volts to check voltage at the outlets. Compare the reading with the voltage printed on the generator’s label. Never probe inside the housing. | With the generator off and cool, check external cords, plugs, and panel connections for looseness or damage. Replace damaged cords rather than repairing them. |
Never open the housing of a running or recently run generator. Do not attempt component-level repairs without model-specific service documentation. A zero reading at an unloaded outlet after every reset has been done points to an internal fault.
What if the generator feeds a transfer switch or house wiring?
Disconnect the transfer switch or inlet cord first and test directly at the generator. If the generator works on its own, the fault is in the power cord, the inlet box, the transfer switch, or a tripped breaker in the house panel. Have a licensed electrician inspect that wiring. Never connect a generator to house wiring without a transfer switch.
When should I stop troubleshooting and contact an authorized service center?
Stop when the resets and direct-appliance tests do not restore output, or when any protection device trips with nothing connected. The Generac portable generator troubleshooting guide and Cat both direct owners to customer support or an authorized service center at that point.
| Condition | Resettable by the owner? | Next step |
|---|---|---|
| Output returns after the breaker, GFCI, or overload reset | Yes | Reconnect loads one at a time and stagger startups |
| Works directly but not through a cord or transfer switch | Yes (outside the generator) | Replace the cord or call an electrician |
| Trips with an appliance connected but holds unloaded | Usually | Test that appliance on its own; it may be faulty or exceed the rating |
| Breaker or GFCI trips with no load connected | No | Authorized service |
| Overload light stays on after a correct reset | No | Authorized service |
| No AC output, no indicators, or burning smell | No | Stop using it and arrange warranty or technician diagnosis |
Opening the unit yourself may void the warranty. Electrical parts can also hold a dangerous charge after shutdown. Disconnect all loads and let the generator cool before any external inspection.
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How do I prevent output loss?
- Manage loads: Add up startup watts, not just running watts, and start the largest motor first.
- Keep connections dry: Run the generator under a ventilated cover outdoors and use outdoor-rated cords.
- Inspect regularly: Check cords, plugs, and the control panel for damage before each use.
- Maintain the engine: Follow the manual’s oil, fuel, and storage schedule. Then a sagging engine is less likely to trigger protection under load.
What do owners say?
Owners like
- Dependable starting when the generator is maintained properly
- Quieter running than conventional portable generators
- Stable power that suits sensitive electronics
- Compact, portable size and good fuel efficiency
- Clear indicator lights and simple reset controls on well-designed models
Common complaints
- Output can cut out after an overload while the engine keeps running
- GFCI or breaker trips are confusing when the generator otherwise seems normal
- Model-specific reset steps are not always easy to find or follow
- Some owners lose output early and need a warranty evaluation
- Service and technical support can be frustrating when internal inverter parts fail
Summarised from owner reviews and long-term user reports; individual experiences vary.
What is the short version?
Start with simple checks. Disconnect everything, restart unloaded, reset the breaker, GFCI, and overload controls, and test with a known-good appliance plugged in directly. Turn Eco mode off while you diagnose, and stagger startup surges once output returns. Drill flashing and brush checks belong to conventional generators, not most inverter models. Faults in the inverter module, control board, or windings need professional service.
Regular maintenance and careful load management prevent most of these problems. A properly maintained generator means reliable power when you need it most.
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