The Question Most Generator Owners Ask Too Late
You bought a standby generator, had it professionally installed, and now it sits quietly beside your house doing its weekly self-test every Sunday morning. Everything seems fine. So when exactly do you actually need to have someone come out and service it?
This is one of the most common questions we get from homeowners across the Houston area. Most people assume that because the generator starts up on its own and the test cycle runs without issue, the unit is in good shape. That assumption has led to more than a few unpleasant surprises when a real outage hits and the generator either fails to carry the full load or shuts down after a few hours.
We’ve been maintaining generators in Houston and the surrounding communities since 2010, and we can tell you that proper service intervals make an enormous difference in both reliability and longevity. Here is a straightforward breakdown of what the maintenance schedule should look like and what you risk by skipping it.
The Short Answer: Once a Year at Minimum
For most residential standby generators running on natural gas or propane, the manufacturer recommendation is a full service every 12 months or every 200 hours of operation, whichever comes first. In Houston, where generators may run for extended periods during hurricane season or severe storms, you may hit that 200-hour mark faster than you expect.
Both Generac and Kohler publish detailed maintenance schedules in their owner’s manuals, and those schedules are not arbitrary. They are based on engineering data about how long components like oil, filters, spark plugs, and belts hold up under real operating conditions.
If your generator runs longer than usual during a storm event, don’t wait until the annual anniversary to schedule a service. Running for 48 or 72 consecutive hours puts real wear on the engine, and an inspection afterward is smart practice.
What a Proper Generator Service Includes
A generator tune-up from a certified technician is not just an oil change. A thorough annual service covers several systems, each of which can cause a failure if neglected.
Engine oil and oil filter. Generator engines, like car engines, break down oil over time. Dirty or degraded oil accelerates wear on internal engine components. Oil and filter replacement is the foundation of every service visit.
Air filter. Houston’s humidity and outdoor environment mean your generator’s air filter collects debris faster than you might expect. A clogged air filter restricts combustion and reduces efficiency.
Spark plugs. Worn spark plugs lead to hard starts, misfires, and rough running. They’re inexpensive to replace and critical to reliable startup.
Fuel system inspection. For propane-powered units, we inspect fuel lines, connections, and the carburetor. For natural gas units, we verify gas pressure and inspect the regulator.
Battery and starter system. The generator’s starting battery is one of the most common failure points. We test battery voltage, check connections, and replace the battery on the recommended cycle, typically every two to three years.
Coolant check. Larger standby generators use liquid cooling systems. Coolant degrades over time and needs to be checked and replaced according to the manufacturer schedule.
Transfer switch inspection. The transfer switch is the component that switches your home between utility and generator power. We inspect it for signs of wear, corrosion, or loose connections.
Exercise test and load check. After the mechanical service is complete, we run the unit under load and verify it performs correctly across the full range of your home’s electrical demand.
According to Generac’s official maintenance guidelines , annual professional service is required to maintain warranty coverage on their residential standby products. Skipping service doesn’t just risk reliability; it can void the protection you paid for.
Seasonal Considerations for Houston Generators
Houston’s climate creates some specific maintenance considerations that differ from cooler parts of the country.
Pre-storm season service. The Atlantic hurricane season runs June through November, with peak activity in August and September. We strongly recommend scheduling your annual service before June so your generator is fully ready before that window opens. Every year we get calls in August from homeowners who haven’t had their generator serviced, and sometimes we can fit them in quickly, but there are no guarantees once storm season is active.
Heat and humidity. Houston’s summers are brutal on mechanical equipment. High ambient temperatures affect how your generator manages heat, and humidity accelerates corrosion on battery terminals and electrical connections. These are things a trained technician will catch during an inspection that you might not notice yourself.
Post-extended-run service. If your generator ran for more than 24 hours during a storm, schedule a service call within the following month. Check the oil level yourself immediately after a long run, and call us if anything looks or sounds unusual.
Warning Signs That Mean You Shouldn’t Wait for Annual Service
Beyond the annual schedule, there are specific signs that your generator needs attention sooner. Don’t ignore these.
- The unit hesitates or fails to start during the automatic weekly test
- You notice unusual smoke, smell, or noise during operation
- The control panel displays a fault code or warning light
- The generator shuts down before the outage ends
- Oil or coolant appears to be leaking from the unit
Any of these issues warrants a call to a certified technician. Call us if you see any of them. A generator problem rarely announces itself at a convenient time, and the sooner it is looked at the less likely it is to become a failed start during an outage.
The Case for a Maintenance Plan
One of the things we offer at Critical Power Solutions is a structured maintenance plan that takes the scheduling burden off the homeowner entirely. Rather than trying to remember when the last service was or tracking hours of operation yourself, we keep the records and reach out to you when service is due.
A maintenance plan also gives you priority scheduling during busy storm season periods, when demand for service technicians across the Houston area spikes dramatically. Our plan customers don’t wait in line.
You can learn more about our generator maintenance plans on our website, or give us a call and we’ll walk you through the options.
The Electrical Generating Systems Association consistently notes that the majority of generator failures in emergency situations are directly attributable to deferred or skipped maintenance. Reliability is not a passive outcome. It is the result of consistent, professional care.
Keep Your Generator Ready When You Need It Most
How often should a generator be serviced? At a minimum, once a year, and more frequently if it’s been running hard. For Houston homeowners, that means booking your annual service before June, doing a quick post-storm check after any extended run, and keeping an eye out for warning signs between service visits.
We’ve been keeping generators running reliably across Houston, Sugar Land, Katy, and Richmond since 2010. Contact Critical Power Solutions to schedule your annual generator service or ask about our maintenance plans. A quick service call now is far less costly than a generator failure during the next major storm.