Licensed Electrical Contractor Service for Generac Standby Systems
When your Generac generator shows a fault light or fails its weekly self-test, our technicians diagnose the generator, controller, automatic transfer switch, wiring, and panel connections as one connected system.
Call Absolute Power Electrical Contractors at (210) 981-6868 for 24/7 emergency Generac repair. We offer same-day appointments and free estimates.
Why San Antonio Homeowners Choose Absolute Power Electrical Contractors for Generac Repair
A Generac standby generator connects directly to your electrical panel through an automatic transfer switch (ATS). When a repair involves wiring, the transfer switch, or panel connections, we evaluate the generator, transfer switch, and connected electrical components together rather than treating the generator as an isolated appliance.
Beyond licensing, our approach is straightforward: we explain what we find in plain language, outline your options before any work begins, and communicate costs upfront with no hidden fees. Our technicians bring their own vacuum equipment and clean up before they leave. We hold an A+ rating from the Better Business Bureau and a 5.0 average on Angi’s List. Se habla español.
George Salinas passed the Master Electrician Exam in May 2005 and built Absolute Power Electrical Contractors from a garage operation into a team of over 50 professionals. Genaro Salinas serves as operations manager, coordinating projects to maintain efficiency, adhere to contractor schedules, and comply with OSHA safety regulations. Our apprentices complete formal electrical schooling alongside on-the-job training.
Generac Repair Services We Provide
We service both air-cooled and liquid-cooled Generac standby models for homeowners in Bexar, Kendall, Comal, and Guadalupe counties.
Our Generac repair services include:
System diagnostics: Reading controller alarm codes and identifying the affected subsystem
Electrical connection inspection and repair: Testing and restoring corroded or loose connections
ATS testing and repair: Evaluating automatic transfer-switch operation and response during a power loss
Control board and component repair: Addressing governor faults, voltage-regulator issues, and ignition failures
Parts replacement: Batteries, filters, spark plugs, and other wear components
Common Generac Problems We Diagnose
Problems we diagnose include battery failure, corroded electrical connections inside the enclosure, and an ATS that doesn’t transfer properly when utility power drops. We also inspect low-oil-pressure shutdowns and units that crank but won’t start because of a fuel-delivery fault or failed ignition component. A Generac that starts and then shuts down shortly after may be responding to a protective shutdown. Low oil pressure, high temperature, and an overcurrent condition are among the possible causes, so a technician needs to diagnose the system before parts are replaced.
GenCare: Annual Maintenance for Your Generac System
Our GenCare program is our annual generator maintenance plan for standby systems, including Generac models. It provides a recurring service path after a repair or before a high-demand season, with detailed service inclusions outlined below.
A repair visit begins with a conversation about what you’ve observed: any fault codes on the controller and how the unit has behaved. From there, our technician inspects the generator, the ATS, the control panel, and all electrical connections. Once the diagnosis is clear, we explain what we found, walk through the repair options, and confirm pricing before any work starts.
After the repair, we run a full operational test to confirm the system starts, runs under load, and transfers correctly when those checks are appropriate for the system. Repair timelines depend on the condition identified and the required replacement part.
GenCare & the Absolute Advantage Membership for Generac Owners
GenCare can help identify developing maintenance needs before the next outage instead of waiting for a failure. See the full list of service inclusions in the GenCare Annual Service section below.
Absolute Advantage Members receive priority scheduling, which can be useful during periods of high repair demand. Members also receive service discounts and reduced emergency trip charges.
Generac System Types We Service
Air-Cooled Generac Units Air-cooled models use an air-cooled engine and require annual oil changes, air filter service, and spark plug replacement. Both air-cooled and liquid-cooled units use a generator controller and automatic transfer switch, so system type, model, size, and fault symptoms affect the inspection path.
Liquid-Cooled Generac Units (25kW and Above) Liquid-cooled units support larger electrical loads and include additional cooling-system components, including coolant and a water pump, that require inspection during service. Repair visits for liquid-cooled units account for the cooling circuit alongside standard electrical and fuel-system checks.
How San Antonio’s Climate Affects Generac Reliability
San Antonio’s summer heat can increase operating stress on air-cooled Generac equipment. Humidity, dust, and debris can also affect batteries, electrical connections, and airflow around a standby generator. Corrosion at terminals or wiring connections and debris in the enclosure are service indicators that merit inspection rather than an assumption about a single cause.
A pre-season inspection can be useful when the system has remained idle for an extended period.
GenCare Annual Service: What Each Item Covers
Each GenCare visit includes a defined set of inspections and service items. Required service items may vary by model, condition, and manufacturer instructions.
Visual Inspection for Wear, Damage, & Leaks Reviews the system for wear, damage, leaks, and enclosure concerns that may need further attention.
Electrical Connection Checks Checks generator electrical connections for condition and corrosion.
Oil and Oil Filter Service Replaces the engine oil and oil filter according to the service scope for the model.
Air Filter Replacement Replaces the air filter to maintain airflow through the system.
Spark Plug Replacement Replaces spark plugs that affect ignition and startup.
System Diagnostics Uses system diagnostics to review stored fault codes and other controller information.
Load Test Uses load testing to evaluate generator operation under electrical demand.
ATS Operation Verification Verifies that the automatic transfer switch responds as part of the standby-system check.
Wiring, Fuel, Exhaust, & Safety System Inspection Checks the condition of wiring, fuel, exhaust, and related safety systems included in the GenCare service scope.
Warning Signs Your Generac Generator Needs Service
Watch for these indicators:
Alarm lights on the controller panel: Yellow indicates a warning; red signals an active fault. Either requires diagnosis, and the specific code helps guide inspection of the affected subsystem.
Failed exercise cycle: If the automatic exercise cycle doesn’t complete or logs a fault, the unit should be inspected before the next outage.
Unusual sounds during operation: Knocking, surging RPMs, or rapid cycling can indicate a mechanical, fuel-delivery, or other condition that requires diagnosis.
Starts and then shuts down: A protective shutdown may be triggered by low oil pressure, high temperature, or an overcurrent condition. A technician can test the system to distinguish among them.
Physical signs at the enclosure: Visible oil leaks, fuel odor, or corrosion on terminals and wiring are service indicators that should be evaluated.
If you’re considering adding a new system, learn more about our generator installation services.
Get a Free Estimate for Generac Repair in San Antonio
For Generac repair, San Antonio homeowners can rely on our technicians to inspect the generator and its connected electrical components. We’re available 24/7 for emergency repairs, and you can schedule same-day appointments. We provide free estimates with transparent pricing before any work begins.
Call Absolute Power Electrical Contractors at (210) 981-6868 to schedule generator repair service in San Antonio or request a free estimate online.
"We are very grateful. Thank you for your service!"
They told us what they were going to do step by step and ask us if there were any questions. Not only did they do a great job but they also vacuumed and swept the floors when they were done.
- Nicolas M.
"Would definitely recommend, and will use them in the future!"
Luis and Carlos were very professional and did a good job. They even cleaned up after themselves with this little vacuum cleaner they brought, which I honestly wasn’t expecting.
- Sky F.
"Will use for all future electrical needs."
Quick turn around time to schedule and complete job. Outstanding work by the employees to put forth an extra effort and do things right the first time. No Complaints with quality of work!
- Eli R.
"I will definitely use them in the future."
I called for an estimate and scheduled a time for someone to come out. Isiah and Matt showed up to my house, gave me some options and quickly went to work. These guys were very professional, informative and respectful.
- Bradley T.
"I would definitely recommend this A+ business to my colleagues!"
I explained to him both my needs and expectations for my home and he was able to guide me through the process of determining the best options for my family. I really appreciate his honesty.
- Rose P.
"Would definitely use them again!"
Neat Work. Prompt service. Took longer than expected but work was done patiently and very nicely. Problems that were created by the work were promptly addressed.
- Former Customer
"Would and will call them any and every time going forward!"
Days leading up to work they called to confirm my needs and requests were being met and to confirm our appointment. They showed up early for the appointment, and allowed me to throw on some extra work before they left.
- Former Customer
"Absolutely recommend Absolute Power for your electrical needs."
They were on time, professional and no pressure in the estimation of work I asked about. They are also working an estimate for our kitchen for lighting as we take on an additional project very soon.
