A standby generator has one job: start every single time, without warning, in any weather. The only thing that guarantees it can is maintenance. We have serviced backup power systems across New Hampshire and Massachusetts since 1989, and nearly every no-start emergency call we run in a storm traces back to the same root cause — a unit that sat for years without professional attention.
As a Generac PowerPro Premier Dealer whose technicians train at the Generac factory annually, Chamberlin Electric follows the manufacturer’s service requirements on every unit we touch. Here is the full picture of what your generator needs, when it needs it, and what you can do yourself between professional visits.
Why Generator Maintenance Is Non-Negotiable
Think of your standby generator as a car engine that lives outside year-round, endures New England’s full temperature swing, and is expected to sprint from cold start to full load in seconds — sometimes after months of inactivity. Oil degrades over time whether or not the engine runs. Batteries weaken quietly, and cold snaps expose them. Rodents find enclosures irresistible in fall. Fuel system components, air filters, and spark plugs all age.
Maintenance is also a warranty matter. Generator warranties expect the unit to be maintained according to the manufacturer’s schedule, and skipped service can complicate a claim when a component fails. An inexpensive annual visit protects a five-figure investment — the math is not close.
The Maintenance Rhythm: Weekly, Monthly, and Annually
Weekly: The Self-Test (Automatic)
Your Generac runs a brief automatic exercise cycle — typically five to twelve minutes once a week at a day and time you choose — to circulate oil, charge the battery, and verify readiness. Your only job is awareness: notice whether it ran, and take any alarm or error code on the controller seriously. If you did not hear the exercise cycle this week, that silence is information. Modern units with Wi-Fi monitoring can push status alerts to your phone, so a missed test never goes unnoticed.
Monthly: The Homeowner Walk-Around
Once a month — more often in winter — give the unit two minutes of attention:
- Confirm the controller shows ready status with no alarms.
- Keep the enclosure clear: at least a few feet of clearance from snow drifts, leaves, grass clippings, and plantings, with air intakes and exhaust unobstructed.
- Look for signs of rodent activity, insect nests, or physical damage.
- Check for oil or fuel odors or visible leaks around the pad.
- For propane systems, glance at tank level — heading into a storm with a low tank defeats the purpose.
Annually: The Professional Service Visit
Once a year — or after roughly every couple hundred hours of runtime, whichever comes first — the unit needs a comprehensive dealer service. Heavy storm seasons with long run times can move that clock forward: a generator that carried your home through a week-long outage has aged the equivalent of many quiet months.
What a Professional Service Visit Actually Includes
A real dealer maintenance visit is much more than an oil change. When a Chamberlin Electric technician services your Generac, the checklist includes:
- Engine oil and oil filter replacement, using the oil grade specified for our climate.
- Air filter inspection and replacement, and spark plug inspection or replacement per the service interval.
- Battery testing under load, terminal cleaning, and replacement recommendations before winter exposes a weak cell.
- Valve clearance checks and adjustment as specified for your model — a commonly skipped item that directly affects starting reliability and engine life.
- Fuel system inspection: gas connections, regulator operation, and leak checks.
- Controller firmware, program settings, and exercise schedule verification.
- Transfer switch inspection — connections, contacts, and correct operation.
- A full simulated-outage test under load, confirming the system starts, transfers, carries the house, and retransfers exactly as it will in a real event.
- Enclosure, wiring, and pad inspection, including rodent damage — chewed harnesses are a leading cause of mystery faults in our area.
New Hampshire Seasonal Considerations
Our climate adds a few local wrinkles to the standard schedule. In late fall, we recommend confirming the battery is strong, the correct cold-weather oil is in the crankcase, and any cold-weather kit (battery warmer and crankcase heater) is functioning — these accessories dramatically improve cold-start reliability below freezing. Through winter, keep the unit shoveled out after every storm; a generator entombed in a plow drift cannot cool itself or breathe. In spring, clear winter debris and check for salt or moisture corrosion. For a deeper dive on cold-season care, see our winter generator maintenance tips.
Timing matters too. The smartest month to schedule annual service is before storm season peaks — late summer through early fall — when the calendar is flexible. After the first big ice storm, every dealer in the state is running emergency calls, and the units that get serviced in September are the ones purring in January.
DIY vs. Dealer: Where the Line Sits
Homeowners can and should handle the awareness tasks: monitoring the weekly exercise, keeping clearances open, watching tank levels, and reporting alarms promptly. Mechanically inclined owners sometimes handle basic oil changes on out-of-warranty units.
Everything else belongs with a trained technician — and not only for warranty reasons. Standby generators combine line-voltage electricity, pressurized fuel gas, and an automatic transfer switch tied into your home’s service equipment. Valve adjustments, fuel-system work, transfer switch service, and control diagnostics require training, instrumentation, and respect for the hazards involved. Generac PowerPro Premier Dealers exist precisely because the manufacturer wants this work done by people it has trained; our technicians return to the factory every year to stay current on new models and updated procedures.
During and After Extended Outages: The Forgotten Maintenance Window
Most maintenance guidance assumes a generator that mostly waits. But New Hampshire storms regularly produce outages measured in days, and continuous running changes the rules. During a long run, check the unit every day or so: confirm no alarms, verify airflow paths remain clear (drifting snow can bury intakes mid-storm), and monitor propane levels so a refill is ordered before the tank runs low — suppliers get very busy in regional outages. Some models call for checking or topping off oil during extended operation; know what your manual specifies before the storm, not during it.
After the grid returns, treat a multi-day run like the significant engine event it was. A post-storm checkup — oil condition, filters, battery recovery, and a scan of the controller’s event log — catches wear before it becomes a failure during the next event. Storms often come in clusters; the generator that just finished a four-day marathon may be asked to run again next week.
Fuel System Notes: Propane vs. Natural Gas
Fuel-side health is part of maintenance too, and the two fuels age differently. Natural gas systems are the simpler case — no tank to manage — but annual service still verifies regulator operation, connection tightness, and adequate supply pressure under load. Propane systems add tank logistics: keep the tank comfortably full heading into winter, since cold weather slows propane vaporization and a low tank in deep cold may struggle to deliver full-rated fuel flow exactly when demand peaks. Regulators and lines must stay protected from ice buildup and snow-shedding rooflines.
Either way, fuel work is professional territory. Gas leaks, pressure problems, and regulator faults are safety issues first and reliability issues second — if you ever smell gas near the unit, shut it down at the controller if safe to do so, leave the area, and call for service immediately.
The Payoff: What Well-Maintained Units Do Differently
The difference shows up exactly when it matters. Well-maintained generators start on the first crank in subzero cold, carry rated load without hunting or stalling, and run multi-day outages without drama. Neglected units are the ones we meet at 2 a.m. — dead batteries, varnished fuel components, chewed wiring, and error codes that had been flashing ignored for months.
Maintenance also compounds financially. Annual service extends engine life by years, preserves warranty coverage, maintains resale value (a documented service history is a genuine selling point for your home), and converts most would-be emergency repairs into planned, inexpensive fixes. Our customers’ experiences tell the story better than we can — browse our testimonials and you will notice how often reliability during a real outage is the headline.
Frequently Asked Questions
How often does a Generac generator need servicing?
Plan on professional service once a year, or sooner after heavy runtime — roughly every couple hundred operating hours. Between visits, the unit exercises itself weekly and you should do a quick visual check monthly. Long outages accelerate the schedule, so after a week-long storm event, book a service even if your annual visit is months away.
What happens if I skip generator maintenance?
Reliability decays silently — the unit may keep passing its brief weekly exercise while losing the health it needs to run for days under load. Skipped maintenance is the leading cause of storm-time failures we see, and it can complicate warranty claims. The annual visit costs a small fraction of a single emergency repair.
Can I service my Generac generator myself?
You can handle monitoring, clearances, and cleanliness, and experienced owners sometimes do basic oil changes. Valve adjustments, fuel and gas work, battery load-testing, transfer switch service, and diagnostics should be left to a certified technician — both for safety and to protect your warranty.
How do I know if my generator battery needs replacement?
Batteries typically give little warning to the naked eye, which is why professional load-testing during annual service matters. Slow cranking during the weekly exercise, a battery-related alarm on the controller, or a battery more than a few years old heading into winter are all reasons to replace proactively — batteries are cheap; no-starts are not.
Does Chamberlin Electric offer generator maintenance plans?
Yes — we service Generac systems across New Hampshire and Massachusetts, including units we did not originally install, and we can put your generator on a regular annual schedule so it is always storm-ready. Call (603) 595-9473 to get on the calendar.
My generator is showing an error code — what should I do?
Note the code, do not repeatedly retry starts, and call your servicing dealer. Many codes point to simple fixes when addressed promptly — and to expensive ones when ignored until a storm. Chamberlin Electric offers 24/7 emergency service for exactly these moments.
More questions? Check out our dedicated FAQs resource linked here.
Keep Your Generator Storm-Ready with Chamberlin Electric
Your generator protects everything — but only if it starts. Chamberlin Electric’s Generac factory-trained technicians provide complete annual maintenance, diagnostics, and 24/7 emergency service from our Hudson, NH headquarters, and we have been keeping New England powered since 1989.
Call (603) 595-9473 or contact us online to schedule your annual service before the next storm tests your system.