Roanoke, VA Standby Generator Installation & Maintenance — 7 Start-Up Fixes

Estimated Read Time: 11 minutes

Power flickers are part of life in the Blue Ridge, but a standby generator that won’t start turns a storm into a crisis. If your standby generator won’t start, this guide explains the most common causes and the exact fixes that get you back online safely. We also cover when to DIY and when to call a pro. Free virtual consultation available for Roanoke‑area homeowners.

1) Battery issues: discharged, corroded, or aged

Your generator’s 12‑volt battery provides the cranking amps to start the engine. If it is weak or dead, the unit will not turn over.

Fixes:

1. Check status on the controller. Many Generac and Kohler models flag low battery on the display.
2. Measure voltage. A healthy battery should read about 12.6 volts at rest.
3. Clean and tighten terminals. Remove corrosion with a battery cleaning brush. Re‑secure lugs.
4. Replace aged batteries proactively. Standby batteries typically last 3–4 years in our climate.
5. Test the charger. If the battery keeps dying, the trickle charger or fuse may have failed.

Pro tip: Members of our Service Club receive a complimentary battery at year 4. That prevents most no‑start surprises.

2) Fuel supply problems: empty tank, closed valves, or pressure too low

Generators will lock out if fuel is not present or pressure is out of spec.

Fixes for natural gas:

1. Confirm the manual shutoff valve at the meter and at the generator are fully open.
2. Check other gas appliances. If they struggle, you may have a utility pressure issue.
3. After utility work or storms, debris can clog regulators. A licensed tech should verify inlet pressure under load.

Fixes for propane:

1. Verify tank level is above 25 percent to avoid pressure drop in cold weather.
2. Open the service valves and confirm no ice on the regulator.
3. If a two‑stage regulator is required for your run length, have it inspected or replaced.

Safety note: If you smell gas or suspect a leak, evacuate and call your gas provider before restarting the generator.

3) Faulty or clogged air and fuel filters

Restricted air or fuel flow starves the engine. That can cause hard starting or a stall after a few seconds.

Fixes:

1. Inspect the air filter. Replace if it looks dirty or oily.
2. Replace the fuel filter on schedule. A clogged filter can mimic a failing pump.
3. For carbureted standby models, stale fuel varnish can stick the float. A professional cleaning may be required.

Maintenance reminder: Annual service includes fresh filters and a full system check so airflow and fuel delivery stay within spec.

4) Low oil, wrong oil grade, or failed oil sensor

Modern standby generators protect themselves by shutting down on low oil or pressure. Winter cold in Roanoke and Salem can also thicken oil and slow cranking.

Fixes:

1. Check the oil level on a level pad. Top off to the mark using the manufacturer’s recommended weight.
2. Use the correct viscosity for seasonal temps. Your manual lists approved grades.
3. If the low‑oil light stays on with correct level, the sensor may be faulty. A tech can test and replace it quickly.

5) Control board alarms and transfer switch interlocks

If the controller sees a fault or the automatic transfer switch is not in the correct state, the unit will refuse to start.

Fixes:

1. Read the fault code on the display. Common codes include overcrank, overspeed, and undervoltage.
2. Perform a safe reset. Place in OFF, wait 30 seconds, then back to AUTO.
3. Inspect the automatic transfer switch. Ensure it is not manually locked, and that utility sensing is correct.
4. After major utility events, contact a licensed electrician to test switch contacts and torque lugs.

Local insight: Appalachian Power grid events after ice storms often trigger nuisance alarms. A quick inspection prevents repeat lockouts.

6) Spark and ignition problems

Worn spark plugs, cracked boots, or a failed ignition coil will cause misfire or a no‑start condition.

Fixes:

1. Remove and inspect spark plugs. Replace if fouled, gapped incorrectly, or older than the maintenance interval.
2. Check ignition leads for cracks. Replace brittle wires.
3. Verify coil output per the service manual. Replace weak coils.

Quality check: Factory‑trained techs use OEM parts and torque specs to protect your warranty and maintain performance.

7) Neglected maintenance or missed exercise cycles

Standby units should self‑exercise weekly. Skipped exercise or long periods without service can build up small issues that become no‑start failures.

Fixes:

1. Confirm the exercise schedule in the controller. Reset to a weekly time when your home is quiet.
2. Complete annual maintenance. Replace oil, oil filter, air filter, and spark plugs as specified.
3. Inspect the enclosure. Clear leaves, nests, and snow from vents for proper airflow.
4. Test under load. A pro can simulate a power failure and verify transfer within spec.

Service interval facts you can trust:

• Kohler offers a 5‑year, 2,000‑hour limited warranty on many residential standby models when installed and serviced per factory guidelines.
• Generac’s Mobile Link lets you view alerts and maintenance status from a phone or computer, which helps you catch small issues before they become outages.

When to DIY and when to call a pro

DIY tasks:

1. Replace air filters, spark plugs, and oil on a maintained schedule if you are comfortable with small engines.
2. Check and clean battery terminals and verify basic settings.
3. Keep the pad and vents clear. Trim shrubs to maintain airflow.

Call a licensed generator technician for:

1. Gas pressure problems, regulator issues, or fuel odor.
2. Electrical faults in the automatic transfer switch or wiring.
3. Persistent controller fault codes, overcrank, or irregular voltage.
4. Load sizing or frequent overload shutdowns. You may need load management configured.

Fast diagnostics checklist before you call

1. Controller status: Any red or yellow alarms? Take a photo of the code.
2. Battery and charger: Is the charger light on and battery over 12.6 volts?
3. Fuel: Tank above 25 percent for propane. Gas valves fully open for natural gas.
4. Oil level: At the mark with the right viscosity for the season.
5. Air filter: Clean and seated. Enclosure vents clear.
6. Exercise: Last run date within the past week.

If two or more items fail this checklist, schedule professional service. A trained tech can usually restore a healthy unit in a single visit.

How Bob Garrett Services solves no‑start calls in Southwest Virginia

We start with the basics, then verify deeper systems with factory tools:

1. Site and safety verification. Confirm gas type, pressure, and ventilation.
2. Battery and charging system test under load.
3. Fuel delivery measurement and regulator inspection.
4. Ignition system and compression checks.
5. Controller diagnostics with manufacturer software. Clear faults and update settings.
6. Automatic transfer switch inspection and torque verification.
7. Full maintenance service if due, followed by a live transfer test.

What sets us apart:

• Largest residential generator dealer in Southwest Virginia for product depth and fast availability.
• Factory‑trained technicians for Generac and Kohler. We install to manufacturer specifications and protect your warranty.
• Remote monitoring support. We help you enable Generac Mobile Link or Kohler OnCue so you get alerts before outages.
• No‑waiting installs available. When storms are forecast, we prioritize readiness for Roanoke, Salem, Vinton, and nearby communities.

Smart upgrades that prevent future no‑start events

1. Remote monitoring. Get instant alerts for low battery, missed exercise, or fuel issues.
2. Cold‑weather kit. Battery warmers and oil heaters improve cranking during Blue Ridge cold snaps.
3. Concrete or composite pad with correct elevation. Keeps the enclosure level and clear of snow and runoff.
4. Load management modules. Avoid overload faults by staging large appliances.
5. Service Club membership. Annual tune‑up, priority scheduling, and savings on non‑warranty repairs help your system start every time.

Brand‑specific notes our techs see in the field

• Generac Guardian models: Wi‑Fi enabled units pair with Mobile Link for remote alerts. Keep the app logged in and notifications enabled.
• Kohler home standby units: Kohler’s automatic transfer switch is designed to restore power in 10 seconds or less. If transfer exceeds spec, have the switch inspected.
• Both brands: Keep firmware and controller settings updated during annual service to maintain reliability and warranty compliance.

Quick start decision tree

1. No crank at all
   • Likely battery or controller lockout. Verify charger, reset to AUTO, and test.
2. Cranks but does not start
   • Often fuel or spark. Check tank level and air filter. Then plugs and fuel filter.
3. Starts then stalls
   • Load or fuel restriction. Inspect filters and run a controlled test without large loads.
4. Runs but will not transfer power
   • Transfer switch sensing or wiring. Schedule a licensed electrician to test the ATS.

If at any step you see an error code you do not recognize, take a photo of the controller and contact our team for guided support over the phone.

Special Offers for Generator Owners

• Free virtual home consultation and estimate for Generac or Kohler standby generators. Call 540-583-4765 or request service at https://bobgarrettservices.com/
• Service Club members receive 10 percent off non‑warranty repairs, never pay a trip charge, and get a complimentary battery at year 4. Ask about enrollment when you schedule.

What Homeowners Are Saying

"Very impressed by Bob Garretts crew. Installed a 24 kw generator in one day, everything went smooth... communication was excellent."
–John F., Generator Installation

"Colin came to do maintenance on our generator today. He did a fantastic job... He was very thorough and made sure all was clean."
–Just L., Generator Maintenance

"Quickly diagnosed the problem and was able to return my Generac to service without excessive charges."
–Butch H., Generator Repair

"34+ hours and counting without power from the ice storm, and the Generac generator is working well... successful repair!"
–Lorraine S., Emergency Service

Frequently Asked Questions

Why does my standby generator crank but not start?

This usually points to fuel or spark. Check propane level or gas valves, replace the air and fuel filters, and inspect spark plugs. If it persists, schedule service.

How often should I service my home standby generator?

Annually at minimum, plus a weekly exercise run. Replace oil, oil filter, air filter, and spark plugs per brand schedule to protect warranty and reliability.

Can cold weather keep my generator from starting?

Yes. Cold thickens oil and weakens batteries. Use the correct oil grade, keep the battery on a charger, and consider a cold‑weather kit for best cranking.

What is Mobile Link or OnCue and do I need it?

Generac Mobile Link and Kohler OnCue provide remote monitoring. You get alerts for faults, low battery, and missed exercise, which helps prevent no‑starts.

When should I call a professional instead of DIY?

Call a pro for gas pressure issues, transfer switch faults, persistent controller codes, or if the unit stalls under load. Licensed techs diagnose safely and fast.

Stay Ready When the Power Goes Out

If your standby generator won’t start in Roanoke, Salem, Vinton, or nearby, use the steps above to check battery, fuel, filters, oil, and alarms. For fast, factory‑level diagnostics and repairs, call the local experts.

Schedule Service or a Free Consultation

Call 540-583-4765 or visit https://bobgarrettservices.com/ to schedule repair, annual maintenance, or a free virtual consultation for a new Generac or Kohler system. Ask about Service Club benefits for savings and priority response.

Call now: 540-583-4765 • Book online: https://bobgarrettservices.com/ • Free virtual consultation available for new standby generators in Southwest Virginia.

About Bob Garrett Services

Bob Garrett Services is Southwest Virginia’s largest residential generator dealer and a trusted local electrical contractor serving Roanoke, Salem, Vinton, Christiansburg, and nearby areas. Our factory‑trained and certified technicians install, maintain, and repair Generac and Kohler whole‑home generators. We provide fast, no‑waiting installs, expert sizing, and ongoing service. We offer free estimates and flexible financing through GoodLeap. Homeowners count on our clear communication, clean job sites, and reliable follow‑through on every project.