Troubleshooting Common Generator Issues: Professional Repair Solutions for Washington County Residents

When Your Generator Doesn't Perform as Expected

A backup generator is only valuable when it works reliably. Milwaukee homeowners who depend on standby or portable generators for emergency power need to understand the most common generator issues — and know when troubleshooting can be done safely versus when professional service is required.

Common Generator Problems and Their Causes

• Generator won't start: For portable generators, common causes include stale fuel (gasoline degrades in as few as 30 days without a fuel stabilizer), a discharged battery (electric-start models), a clogged carburetor, or a dead spark plug. For standby generators, a dead battery, faulty automatic transfer switch, or control board issue may be responsible.
• Generator starts but won't stay running: This typically indicates a fuel delivery problem — clogged carburetor, dirty fuel filter, or low fuel. It can also result from an overloaded generator or low oil shutoff activation.
• Generator produces no power or low voltage: Loss of residual magnetism in the alternator windings ("loss of excitation") can cause a generator to run without producing output voltage. This requires a process called "flashing the field" to restore. Alternatively, failed components in the control board or voltage regulator may be responsible.
• Generator runs rough or surges: Rough operation or engine surging typically indicates carburetor problems, dirty air filter, incorrect fuel mixture, or spark plug issues.
• Transfer switch failure: The automatic transfer switch on standby generators can fail to activate during an outage or fail to return power to utility when power is restored — leaving you running on generator power unnecessarily.

Safe DIY Checks vs. Professional Service

Homeowners can safely check fuel levels, inspect and clean air filters, check oil levels, and replace spark plugs. However, electrical components inside the generator, transfer switch diagnostics, carburetor rebuilding, and AVR/voltage regulator testing should be handled by qualified generator service technicians. Attempting electrical repairs on generator equipment without proper training creates serious safety risks.

Preventive Maintenance Reduces Problems

• Run standby generators monthly under load per manufacturer recommendations
• Use fuel stabilizer in portable generators or drain fuel for long-term storage
• Schedule annual professional service before each storm season
• Test transfer switches regularly to verify proper operation

Why Milwaukee Homeowners Need Reliable Generator Service

Southeast Wisconsin experiences significant ice storms, blizzards, and severe thunderstorm events that can take out power for hours to days. Unlike warmer regions where a power outage is inconvenient but not dangerous, a winter outage in Milwaukee can quickly become a safety emergency. Pipes can freeze within hours in an unheated home during a January cold snap. Sump pumps that lose power during a spring thaw or heavy rain leave basements vulnerable to flooding.

Standby generators connected to natural gas — Milwaukee's dominant utility fuel through We Energies — offer the most reliable backup power because they do not require refueling. They start automatically within seconds of an outage and run indefinitely as long as gas service is maintained. For homeowners who rely on medical equipment, have elderly family members, or have experienced flood damage from sump pump failure, a properly installed and maintained standby generator is a critical home system.

Portable generators, while less expensive, require careful fuel storage and management — especially important in Wisconsin winters when running to the garage for a gas can in sub-zero temperatures is an unwelcome task. Proper fuel stabilizer use and annual carburetor service are essential for portable generators that sit unused for months between storms.

Generator Sizing: Getting It Right for Your Home

One of the most common generator mistakes is purchasing a unit that cannot handle the actual load. Before selecting a generator, calculate the wattage of the circuits you need to power:

• Whole-home standby: Typically 14–22 kW for a Milwaukee home with gas heat, central AC, and standard appliances. A licensed electrician can perform a load calculation to ensure the generator is properly sized.
• Essential circuits only: A smaller transfer switch that covers the furnace, refrigerator, a few outlets, and the sump pump typically requires 7–10 kW — achievable with a smaller standby unit or a well-managed portable generator.
• Critical medical equipment: If you or a family member uses oxygen concentrators, CPAP machines, or other medical equipment, consult a licensed electrician about proper grounding, dedicated circuits, and appropriate generator sizing.

Oversized generators run inefficiently and cost more to fuel. Undersized generators trip their overload protection when too many appliances run simultaneously. Proper sizing is essential — and is part of every Burkhardt generator installation assessment. For related electrical guidance, see our emergency service resource.

Frequently Asked Questions About Generator Service in Milwaukee

How often should a standby generator be serviced?
Annually, before storm season, is the standard recommendation. Some manufacturers specify service every 200 hours of operation for heavily used units. Service includes oil and filter change, spark plug inspection, battery test, air filter check, and transfer switch test.

My portable generator hasn't been started in two years. Is it still good?
Possibly, but it will likely need carburetor cleaning — gasoline left in the carburetor for extended periods varnishes the jets and passages. Drain the old fuel, replace with fresh fuel plus stabilizer, and attempt to start. If it will not run cleanly, professional carburetor service is required.

Can I run my generator in the garage with the door open?
No. Even with the door open, carbon monoxide from generator exhaust can reach dangerous concentrations inside an attached garage and infiltrate the home. Generators must be operated outside, at least 20 feet from any door, window, or vent. Carbon monoxide detectors in the home are essential for households with generators.

How long can a standby generator run continuously?
Most propane and natural gas standby generators can run indefinitely as long as fuel supply is maintained, with brief stops for oil changes per manufacturer schedules. In practice, most Wisconsin utility outages resolve within 24–72 hours, well within the continuous run capability of a properly maintained generator.

Does Burkhardt install and service generators?
Yes. Burkhardt's licensed electricians install transfer switches, connect standby generators to natural gas and electrical service, and perform annual generator maintenance and repairs. Call (414) 355-5520 to schedule service.

Generator Service from Burkhardt

Burkhardt Heating, Cooling, Plumbing & Electric provides professional generator installation, maintenance, and repair services for Milwaukee-area homeowners. Our licensed electricians can diagnose and repair generator issues, install transfer switches, and ensure your backup power system is ready before Wisconsin's next major weather event.

Call (414) 355-5520 to schedule generator service. We are available 24/7 for emergencies. GreenSky financing is available on qualifying generator installations.