A standby generator is your home or business’s first line of defense during a power outage—but only if it’s functioning properly. Like any mechanical system, generators require ongoing care to stay reliable. The challenge? Most issues start quietly and worsen over time, often going unnoticed until the moment you need backup power most. Knowing the generator service signs early can help you prevent costly breakdowns, expensive emergency repairs, and total power failure. Here are the top 10 warning signs that it’s time to schedule generator maintenance before it’s too late.
1. Trouble Starting or Delayed Startup
If your generator takes longer than usual to start—or doesn’t start at all—that’s a major red flag. Delayed startup is often caused by battery failure, fuel delivery issues, or a malfunctioning starter motor. Any hesitation during startup should trigger immediate service.
2. Visible Fuel, Oil, or Coolant Leaks
Leaking fluids are one of the most obvious and urgent signs of generator trouble. Fuel or oil on the ground can signal cracked hoses, faulty gaskets, or damaged fuel lines. Coolant leaks can lead to overheating and serious internal damage if left unresolved.
3. Unusual Noises During Operation
Generators typically produce a consistent, low hum. If you begin hearing grinding, rattling, or clanking sounds, internal components may be worn, loose, or out of alignment. Strange noises are a clear signal it’s time to service your generator.
4. Excessive Exhaust Smoke
A properly functioning generator burns clean. If your system is producing thick, dark, or colored smoke, it could be due to oil burning, a clogged air filter, or a failing injector. These issues can reduce efficiency and shorten your generator’s lifespan.
5. Dashboard Warning Lights or Fault Codes
Modern generators include digital control panels that display alerts or error codes when something’s wrong. If you see any warning lights or unfamiliar messages on the dashboard, don’t ignore them—they’re your generator’s way of asking for help.
6. Inconsistent Power Output
Flickering lights or sudden voltage drops during generator use often indicate internal problems such as worn brushes, fuel system inconsistencies, or control board issues. If your generator can’t hold a stable load, it’s time for a check-up.
7. Irregular Test Runs or Self-Check Failures
Standby generators are programmed to run automatic self-tests, often weekly, to verify they’re ready for action. If your generator skips these tests, fails them, or shuts down mid-test, it’s a clear indicator that service is needed.
8. Visible Corrosion or Physical Damage
Rust, frayed wires, and dented components aren’t just cosmetic problems—they can compromise your generator’s functionality and safety. Physical damage increases the risk of electrical shorts, fuel leaks, and structural failure.
9. Fuel Smell or Poor Fuel Efficiency
If you notice a strong fuel odor near the generator or you’re going through fuel more quickly than usual, it could be a sign of leaks, poor combustion, or an internal fault. These issues reduce runtime and raise safety concerns.
10. Overdue for Routine Maintenance
One of the most common—but most preventable—issues is simply falling behind on scheduled maintenance. If you haven’t serviced your generator in over a year, or can’t remember your last oil change, it’s time to get back on track. Use a generator repair checklist to make sure you’re covering all critical systems.
Why Proactive Service Matters
Waiting for something to go wrong can be costly. A minor issue left unchecked can quickly escalate into a full system failure. Commander Power Systems offers preventive maintenance plans designed to catch problems early, optimize performance, and extend the life of your equipment. Our team services all major brands and provides comprehensive reporting, so you know your system is always ready.
Schedule Your Generator Inspection Today
Don’t wait for an emergency to discover your generator isn’t working. If you’ve noticed any of these generator service signs—or if it’s been a while since your last checkup—contact Commander Power Systems today. We’ll perform a full diagnostic, walk you through our generator repair checklist, and get your system back to peak condition before the next outage hits.
