Table of Contents
You already invested. The standby generator is installed, it ran through last year’s outages without a hitch, and you feel good about it. But here’s the thing, most homeowners don’t think about it until it’s too late. A generator that worked fine last fall isn’t automatically ready for the next storm.
Sitting unused between exercise cycles, exposed to Indiana’s freeze-thaw swings, and slowly burning through a battery that may or may not hold a charge anymore, your system has a lot going on under the hood. Whole home generator maintenance going into storm season isn’t just a good idea. It’s what keeps your backup power from being the thing that fails you when everything else already has.
This isn’t a guide for new owners or people shopping for backup power. This is for homeowners across Central Indiana, including Carmel, Fishers, Noblesville, Westfield, Zionsville, Geist, McCordsville, and throughout Hamilton County, who already have a system installed and want to know if it’s actually ready. Specifically, what a proper standby generator readiness check involves, and whether your system would pass one today.
Key System Checks Before Storm Season
- Battery Condition
If there’s one component that causes more no-start situations than anything else, it’s the battery. Standby generators use a battery to initiate startup. Over time, those batteries lose their ability to hold a charge, especially after the kind of winters we get here in Indiana.
Most batteries last between two and four years. If yours is approaching that window, get it load-tested ahead of severe weather. A weak battery might still read as “charged” on a surface check but fail under the actual demand of a startup sequence. Battery condition is one of the first things a Generac-certified technician checks during a generator readiness check, and for good reason. It’s not something you’d catch just looking at the unit from outside.
- Oil Level and Condition
This one is straightforward but worth taking seriously, especially if your generator logs extended runtime during a multi-day outage. Oil breaks down, and it gets low faster than people expect when a generator runs for 24, 48, or 72 continuous hours.
Check the oil level against the manufacturer’s recommended fill line, and inspect its condition. Dark, gritty oil past its service interval recommendations isn’t doing your engine any favors. If you haven’t tracked runtime hours, your service provider can pull that data from the unit’s controller. For Generac owners, the maintenance reminder built into the controller display handles this automatically. Don’t dismiss those alerts. They’re based on actual runtime, not just the calendar.
- Air Filter
Generators breathe. A clogged or deteriorated air filter restricts airflow to the engine, affecting combustion and potentially causing the unit to run rough or to trip fault codes under load. Air filters are inexpensive to replace and easy to overlook.
Pull the filter and inspect it. If it’s visibly dirty, discolored, or damaged, swap it. If it’s borderline, replace it anyway. Peace of mind before a storm is worth more than saving a few dollars on a filter.
- Spark Plug Condition
Spark plugs wear gradually. The gap widens over time, and fouled or corroded plugs cause misfires that manifest as rough running, especially at startup. This is particularly common in generators that haven’t logged many runtime hours and have been sitting for months between uses.
A generator that starts and runs smoothly during its weekly exercise cycle but then stumbles under a real electrical load during an outage is often dealing with a spark plug problem. Replacing plugs is part of any thorough Generac generator maintenance before severe weather and should be done according to the manufacturer’s recommended schedule.
- Fuel Supply and Fuel Lines
Whether your system runs on natural gas or liquid propane, the fuel supply check looks a little different, but it’s equally important.
In natural gas systems, the concerns are pressure and line integrity. Your technician will verify that the gas supply is consistent and that no fittings or connections have developed leaks, which is especially important after a winter of ground shifting and freeze-thaw stress on older fittings.
For liquid propane systems, it comes down to one question: how much fuel is in the tank? A generator at full load can consume propane faster than most homeowners expect. Knowing your current level, approximate consumption rate, and tank capacity tells you how long you can run before a refill is needed. This is a standard part of any thorough backup generator inspection, and if your Generac unit has Mobile Link monitoring, a connected tank monitor can automatically track levels.
Either way, inspect the fuel lines for cracking or wear. After a full season of temperature swings, rubber fittings can develop issues that aren’t obvious from a distance.
Once the individual components check out, the next question is whether the system works correctly as a whole. That’s where performance testing comes in, and it’s an area where many installed generators fall short, without their owners ever knowing it.
Performance Tests Every Generator Should Pass
- The Exercise Cycle Isn't Enough
Most standby generators are programmed to run a weekly or bi-weekly exercise cycle, a brief, unloaded startup that keeps the engine lubricated and the battery charged. That cycle is valuable, but it doesn’t tell you how the system performs under actual electrical load. Running for 12 minutes with no house circuits connected is very different from powering your HVAC, refrigerator, and other loads when the grid goes down.
Going into storm season, your generator should complete a loaded test run. This means running the system while connected to your home’s electrical circuits to confirm it can handle the demand without tripping, losing frequency, or showing signs of voltage instability. A trained technician can run a proper generator load test and document the results. If your system hasn’t been load tested recently, this is usually where issues surface. It’s far better to find them now than mid-storm.
- Automatic Transfer Switch Verification
The automatic transfer switch (ATS) is the component that detects a utility outage and switches your home to generator power. It’s what makes a standby system genuinely automatic. You don’t have to do anything when the lights go out. But the ATS has moving parts, contacts, and logic controls that need to be confirmed operational before storm season.
A transfer switch test verifies that the switch correctly detects simulated loss of utility power, transfers within the expected time window (usually within seconds), and returns smoothly when utility power is restored. Issues with the ATS often don’t surface during routine exercise cycles because those tests don’t fully simulate a utility interruption as a real outage does.
If the transfer switch has never been tested separately from the generator, it is worth doing so. Standby generator service in Indianapolis and surrounding areas from an authorized provider will include this as part of a comprehensive system check.
- Fault Code Review
Modern standby generators log fault codes and maintenance alerts in the controller’s memory. These can include records of past events, such as hard shutdowns, voltage anomalies, and low-oil-pressure warnings, which aren’t always visible on the panel display but are accessible via diagnostic tools.
Before outages become a risk, have a certified technician perform a fault code analysis as part of a full system diagnostics review. It’s not just about clearing alerts. It’s about understanding whether past events indicate a developing pattern. A recurring low oil pressure code, for example, might point to a seal issue worth addressing before you need the system to run continuously for three days.
For Generac systems with Mobile App enabled, some of this data is already being logged remotely. But a full system diagnostics review in person goes further than remote monitoring alone.
Beyond scheduled testing, your generator may already be showing signs of needing attention before outages become a risk. These are worth knowing.
Signs Your Generator May Need Service Before a Storm
Even without a formal inspection, certain behaviors tell you the system deserves a closer look before outages become a real possibility. None of these are things to ignore:
- Delayed startup. If your generator hesitates noticeably before starting, whether during an exercise cycle or after a power interruption, that points to a battery, fuel-delivery, or control-board issue. A properly functioning unit should start within seconds.
- Warning lights or fault codes on the display. Yellow maintenance indicators and red alarm indicators mean different things, but neither should be dismissed as routine. Red LEDs in particular indicate a condition that may prevent the generator from running when needed.
- Running rough or surging. A generator that sounds uneven, surges under load, or produces visible exhaust that doesn’t clear quickly is telling you something. Rough running can come from fuel delivery problems, a dirty air filter, worn spark plugs, or a developing engine issue.
- Oil spots or residue around the unit. Any sign of oil or fuel leakage on or around the generator needs attention before the unit logs significant runtime hours during an actual outage.
- No exercise cycle in recent months. If your system has been sitting without completing its programmed test runs, possibly due to a controller glitch or a missed schedule change, it needs a proper startup evaluation before you count on it.
Any of these alone is enough reason to schedule a generator pre-season inspection rather than wait until a storm watch is already posted.
Generator Service in Central Indiana
Homeowners across Indianapolis, Carmel, Fishers, Noblesville, Westfield, and the broader Hamilton County area put their generators through real tests every storm season. Indiana weather doesn’t give much warning. Derecho winds, severe spring thunderstorms, and ice storms that knock out power for days are all part of living here. A generator service before storm season is what separates a system that’s ready from one that just looks ready.
At Midwest Generator Solutions, we provide standby generator service across Central Indiana as an authorized provider for Generac, Kohler, and Briggs & Stratton systems. Our technicians are trained to manufacturer standards, follow a structured preventive maintenance program, and have access to genuine parts, so your system gets serviced in a way that keeps your warranty valid and your coverage intact.
Pre-season inspections cover everything discussed above: battery condition, oil level and quality, air and fuel systems, spark plug condition, transfer switch operation, loaded performance testing, and a full fault code review. Most of what we find during these visits isn’t visible from the outside or detectable during a routine exercise cycle. It only shows up when the system is tested under real conditions. We’ll tell you exactly what we find, what needs attention now, and what can wait.
Once storm alerts start circulating across Central Indiana, our schedule fills quickly. Booking ahead means you’re not competing with every other homeowner who waits. If your generator hasn’t had a formal inspection this year, now is the right time to get it on the calendar.
Reach out to Midwest Generator Solutions to schedule your pre-season generator inspection. Call (317) 831-8677 to get started.
FAQs
How often should a standby generator be professionally serviced?
Most manufacturers recommend a professional service interval once per year or at specific engine-hour thresholds, whichever comes first. If your generator runs frequently or logs long hours during extended outages, you may reach the hour-based threshold before a full year passes. Annual service keeps your warranty intact and catches wear before it becomes a failure.
What does a pre-season generator inspection actually cover?
A thorough inspection includes battery load testing, oil level and condition check, air filter inspection, spark plug review, fuel supply and fuel line inspection, transfer switch testing, a loaded startup test, and a fault code diagnostic. The goal is to confirm that the system will perform reliably under real outage conditions, not just during a brief exercise cycle.
My generator completed its exercise cycle this week. Does that mean it's ready?
Not necessarily. The weekly exercise cycle confirms the engine starts, and the battery holds enough charge to initiate startup. Still, it doesn’t test the system under load or verify that the transfer switch will operate correctly during a real utility interruption. A full pre-season inspection goes further than what the exercise cycle reveals.
What's the difference between a yellow and a red indicator light on my generator?
On most Generac systems, yellow LEDs indicate maintenance notifications, such as an oil change due or a service interval reached. Red LEDs indicate alarm conditions that could prevent the generator from running. Both need to be addressed, but a red alarm is more urgent. If you’re seeing any indicator light and aren’t sure what it means, contact a service provider to pull the fault code rather than guessing.
How do I know if my liquid propane tank has enough fuel for an extended outage?
This depends on your tank capacity, your generator’s fuel consumption rate (measured in gallons per hour at various loads), and the length of the outage. A service technician can walk you through the math for your specific system. If you have a Generac unit with Mobile Link, you may be able to add a cellular tank monitor that tracks propane levels remotely and alerts you when levels drop.
Does servicing my generator before storm season affect my warranty?
It should actually protect it. Most manufacturer warranties, including Generac’s, require that a certified technician perform maintenance at specified intervals. Skipping service or using non-authorized providers can void warranty coverage. Using an authorized service provider like Midwest Generator Solutions ensures the work is logged appropriately and your warranty remains valid.
Is there a difference between generator service and generator maintenance?
In practice, the terms overlap. “Maintenance” typically refers to scheduled, preventive work done at regular intervals, such as oil changes, filter replacements, spark plug replacements, and system checks. “Service” can include that, plus diagnostics and repair of any issues identified. A pre-season visit often combines both: completing any overdue maintenance items and running a full system inspection.