Generac Repair in Southern Maryland

Common Generac Generator Problems We Diagnose & Repair

Generac standby generators are built to self-test weekly and transfer power automatically during an outage. When those functions fail, the cause can often be one of a handful of known issues. Here’s what our technicians commonly find:

• Dead or discharged battery: The battery powers the starter motor and supports control board operation during startup. A battery that can’t hold a charge is one of the most frequent reasons a Generac unit won’t start.
• Faulty automatic transfer switch: If the transfer switch can’t detect a utility outage or won’t route power to your circuits, the generator can run while your home stays dark.
• Control panel fault codes: The Generac control panel logs specific error codes for low oil pressure, high coolant temperature, overcrank, and RPM sense loss. Each code points to a different root cause requiring targeted diagnosis.
• Damaged or rodent-chewed wiring: Wiring damage disrupts communication between components and can cause intermittent or complete failure, often with no fault code to make the cause obvious.
• Low coolant levels: The generator shuts down on a high-temperature fault to protect the engine. Low coolant is a common trigger.
• Worn belts and clogged filters: Dry or cracked belts and dirty air or fuel filters degrade performance and can contribute to an unplanned shutdown.
• Spark plug wear or fouling: Air-cooled Generac models can be prone to hard starting and rough running when spark plugs are past their service life.

A unit that fails its weekly self-test or runs rough during the test cycle is telling you something. Diagnosing it before the next outage is far easier than troubleshooting a generator that failed when you needed it most.

What to Expect During a Generac Repair Visit

We service generators we’ve installed and units installed by others. Our licensed electricians work on both residential and commercial Generac systems throughout Southern Maryland, and we also perform generator maintenance to help keep units running reliably between repair calls. Every visit follows a consistent process so nothing gets missed:

• Visual inspection: We examine the exterior enclosure and interior components for physical damage, corrosion, and obvious faults before touching anything.
• Electrical checks: All cables, connections, and wiring are inspected for looseness or damage. Fluid levels, including oil and coolant, are verified.
• Filter and plug service: Air, oil, and fuel filters are inspected and replaced as needed. Spark plugs are examined and swapped if worn.
• Control panel review: We read stored fault codes from the Generac control panel to identify the underlying cause of the failure, not just the symptom.
• Load test: After repairs are complete, we run the generator under load to confirm it starts, transfers power, and runs stably before we leave.