Generator Repair & Diagnostics for Greater Houston Homes
When your generator fails during a power outage, every minute without backup power costs you—comfort, security, refrigerated food, sump pump operation, and safety. LMH Services responds quickly to generator emergencies, diagnosing problems on-site, performing repairs with genuine OEM parts, and testing full system operation so your backup power is ready when you need it. Whether your generator won’t start, loses power mid-outage, or needs routine repair after years of service, we handle it.
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What Separates Reliable Generator Repair from Quick Fixes
Precise Fault Diagnosis with Test Data
A generator problem has a root cause—fuel line blockage, ignition system failure, transfer switch malfunction, fuel contamination, or engine mechanical issue. We connect diagnostic equipment, measure voltage, fuel pressure, control signal voltage, and engine compression. We don’t guess. Written diagnostics tell you exactly what’s broken, why it failed, and what the repair entails.
Seasoned Technician Knowledge of Fuel and Control Systems
Generator repair requires understanding both engine mechanics and the complex fuel/control electronics that govern automatic startup. We’ve diagnosed generators with bad fuel from long-term storage, transfer switches that fail to detect outages, fuel lines crushed by yard work, and fuel regulators worn out from seasonal cycling. That experience means we pinpoint the actual failure, not just the symptom.
OEM Parts and Proper Fuel Integrity
A failed generator fuel pump is a significant investment. Dropping in a lower-cost knockoff might seem economical until the new pump fails in a critical outage. We use manufacturer-approved parts. For fuel issues, we flush contaminated fuel, replace fuel filters sized correctly, and sometimes replace the entire fuel tank if rust or water infiltration is severe.
Transfer Switch Diagnostics and Repair
Many generator “failures” are actually transfer switch failures—the switch doesn’t detect an outage, so the generator never starts. We test transfer switch function: does it sense utility power loss, does it command the generator to start, does it switch load power correctly, does it restore utility power on return. If it’s failed, we repair or replace it.
Load Testing After Repair
A repaired generator must be tested under actual load—not just idle. We run the generator, engage the transfer switch, load it with real home circuits (HVAC, water heater, refrigerator, lights), and confirm sustained output voltage and frequency. You’ll know your backup power works.
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What Houston-Area Homeowners Say
How We Approach Generator Repair
From emergency response to load testing, every repair is documented and tested under actual home loads — so your backup power is ready when you need it.
When you call about a generator failure, we prioritize the call. If you’re in an active outage, we dispatch a technician as quickly as possible. On arrival, we perform a visual inspection: is the generator physically damaged, are fuel lines intact, is there visible corrosion or water intrusion? We check for obvious problems like a tripped fuel shutoff or a blocked exhaust.
We listen to the generator’s cranking or running sound. A healthy engine cranks smoothly; a weak crank suggests low fuel pressure or battery issues. A rough idle or knocking suggests internal problems. We document what we observe.
We perform point-by-point diagnostics to isolate the failure:
Fuel System Test:
- Check fuel tank level and inspect fuel for water, sediment, or discoloration.
- Measure fuel pressure at the generator inlet. Proper pressure is typically 3–8 psi for gasoline, 10–14 psi for propane, depending on the engine.
- If pressure is low, we backtrack: is the fuel pump running (listen for the pump relay clicking when ignition is on), is the fuel line clear, is the filter clogged?
Ignition System Test:
- We check spark plug condition—gap, carbon buildup, electrode wear.
- We measure ignition coil voltage and verify spark at the plug.
- For electronic ignition systems, we test control voltage to the ignition module.
Control System Test:
- For generators with electronic control boards, we measure 12V supply and ground continuity.
- We test the outage-detection circuit: does the transfer switch sense utility voltage loss and send a start signal?
- For manual-start generators, we verify the engine can crank freely and ignition key responds.
Engine Mechanical Assessment:
- We measure compression in all cylinders. Low compression (under 100 psi for most small engines) suggests worn rings or stuck valves—this requires engine overhaul or replacement.
- We check oil level and condition. Dirty or low oil can cause poor starting and rough running.
If fuel is the culprit—contaminated, stale, or depleted in octane—we perform fuel system service:
- Fuel Tank Drain and Inspection — We drain the fuel tank completely and visually inspect for rust, sediment, or water. Light rust can be cleaned; heavy corrosion usually requires tank replacement.
- Fuel Line Replacement — Old fuel lines can crack or degrade, allowing air leaks or fuel seepage. We replace lines with code-approved tubing.
- Fuel Filter Replacement — A clogged filter starves the engine of fuel. We replace it with OEM spec and perform a pressure test after replacement.
- Carburetor or Fuel Injector Cleaning — Stale fuel leaves varnish inside carburetors. We soak and clean the carburetor assembly or, for fuel-injected engines, run fuel system cleaner through the injectors.
For propane systems, we replace regulator filters and test gas pressure regulation. For natural gas, we inspect the regulator, test for leaks, and ensure pressure is stable.
If the fuel system is good but ignition is the problem:
- Spark Plug Replacement — Simple and often the fix. New plugs with correct gap restore ignition.
- Ignition Coil Replacement — If coil voltage is weak or absent, we replace the coil with an OEM part.
- Control Board Repair or Replacement — Modern generators have control boards (microprocessor-based) that manage startup, shutdown, load transfer, and fault detection. If diagnostics show control voltage missing or faulted, we replace the board.
If the generator won’t engage because the transfer switch isn’t commanding it:
- Voltage Sensor Test — Does the switch sense utility voltage loss? If not, the voltage sensor may be failed.
- Control Relay Test — Does the switch send a start signal to the generator control? If not, the relay is failed.
- Mechanical Switch Test — Does the switch physically connect load power from generator to home? A stuck mechanical switch won’t transfer power even if the generator is running.
- Replacement — If any component is failed, we replace the entire transfer switch assembly. Transfer switches are sealed units; internal components cannot be repaired individually.
Once repair is complete, we test the generator under load:
- No-Load Test — Start the generator and let it run idle for a few minutes. Check for smooth operation, stable RPM, and correct idle fuel consumption.
- Half-Load Test — Engage the transfer switch and run approximately half of your protected circuits (HVAC, refrigerator, water heater, lights). Measure output voltage—it should be within ±5% of 120V nominal—and verify sustained operation for at least 30 minutes.
- Full-Load Test — Engage all protected circuits. Monitor voltage and frequency. The generator should not stall, surge, or drop voltage excessively under full load. If you have electric vehicle charging installed, we’ll confirm the generator can support your charging circuit safely.
- Automatic Switchover Test — For transfer switch repairs, we simulate an outage by disconnecting utility power and confirming automatic generator startup and power transfer. We then restore utility power and confirm the switch transfers back to utility and shuts down the generator.
We provide a detailed repair report documenting:
- What was wrong (root cause)
- What was repaired or replaced (parts used, labor time)
- Test results (fuel pressure, ignition voltage, load test data)
- Warranty on parts and labor
We discuss preventive maintenance: annual inspections, fuel treatment for seasonal generators, oil changes, and load testing. We offer generator maintenance plans so you catch problems before the next outage.
If the repair revealed aging equipment or upcoming failure risk, we discuss upgrade options and can provide a quote for a new generator installation if replacement makes sense. If your home’s electrical panel capacity is limiting backup power expansion, we can also evaluate electrical panel upgrades.
We’ll Diagnose and Repair It Fast
Generator failures are stressful, especially during an outage. LMH Services offers emergency response and comprehensive diagnostics so you understand the problem and the repair path.
Financing Your Generator Repair
Generator repairs can be unexpected expenses, especially during emergency situations. LMH Services partners with Wisetack for flexible financing, so you can get your backup power restored without straining your budget.
Financing Benefits
LMH Services has partnered with Wisetack to give you more ways to pay. Wisetack lets you check your options in seconds with no impact to your credit score, and offers simple monthly payment plans without the financial stress.
Keep Your System Running Strong with a Maintenance Plan
Prevent generator failures before they happen. A maintenance plan from LMH Services includes annual inspections, fuel system cleaning, load testing, and early problem detection — keeping your backup power reliable for both Deer Park homes and businesses across the greater Houston area.
Our Maintenance Plans Include
24 Hour Service Available
Plan members get priority access to our 24/7 emergency service line
Prompt, Local Service
We are locally operated in Deer Park and respond quickly
Expert Technicians & Installers
Thorough inspections that catch small issues before they become expensive repairs
Residential & Commercial
Plans tailored to homeowners and business owners alike
Generator Repair Service Areas
LMH Services responds to generator emergencies and repair requests throughout the greater Houston area from our home base in Deer Park, TX. Wherever you are in our service area, you get the same expert diagnostics, OEM parts, and load testing.
Serving Communities Around:
Not Sure If We Service Your Area?
Chances are we can help! We’ve served the southern Houston area for a while, so please call 832-800-4564 or contact us today to see if we come out to your area.
Generator Repair Questions
Not necessarily. Common startup failures are fuel starvation (clogged filter, fuel line blockage), bad spark plugs, stale fuel, or a transfer switch not signaling the generator to start. We diagnose the root cause with test equipment so you know the actual problem and repair cost before we proceed.
We respond to emergency calls as quickly as possible. For simple repairs (spark plug, fuel filter, fuel system flush), we can often restore your backup power within 1–2 hours. Complex repairs (control board, transfer switch, engine mechanical issues) may take longer. We’ll assess the problem and give you a realistic timeline on arrival.
Warranty depends on when the generator was installed and the manufacturer’s terms. We can repair any brand. For warranty service, we’ll help you contact the original dealer or manufacturer. For out-of-warranty repair, we provide estimates and labor guarantees on our work.
Yes. Old fuel degrades into varnish and gums up carburetors. We drain stale fuel, flush the fuel system, clean the carburetor, replace the fuel filter, and test the ignition. A “sitting” generator often just needs fuel system service to run again.
A full inspection checks fuel system condition, ignition system function, transfer switch operation, engine compression, oil quality, battery health (if applicable), and a load test under actual home circuits. We provide a written report with findings and recommendations.
Generator repair is usually not covered by homeowner’s insurance—it’s treated as a home appliance maintenance issue. However, if a generator fails due to lightning strike or other sudden accidental damage, some policies may cover it. Check your policy and ask your agent.
The transfer switch may not be connecting all circuit breakers to the generator, or a breaker on the generator side may have tripped. We’ll check the switch configuration, test for tripped breakers, and verify generator voltage. Sometimes circuits were never configured for generator power during installation—we can correct that.
Annual service—inspection, oil change, filter replacement, fuel system cleaning, and load testing—prevents most failures. For generators that run frequently or in dusty environments, more frequent service may be needed. We’ll recommend a maintenance schedule based on your usage.
Some simple maintenance—oil changes, spark plug replacement, fuel filter changes—can be DIY. But diagnostics and repairs involving fuel systems, ignition electronics, or transfer switches require specialized equipment and training. We recommend professional service to ensure safety and reliability.
If engine damage is severe (low compression, cracked block) or control systems have failed beyond cost-effective repair, replacement may be the right choice. We can quote a new generator installation and transfer switch. Financing is available to make replacement affordable.
Expert Generator Repair in Greater Houston
We use test equipment to measure fuel pressure, ignition voltage, control signals, and engine compression. No guesswork—we identify the root cause and document exactly what’s wrong before we proceed with repair.
Generator failures during outages are urgent. We prioritize emergency calls and dispatch technicians as quickly as possible. For simple repairs, we can often restore your backup power within 1–2 hours.
We use manufacturer-approved parts and provide detailed repair documentation. Our work is warranted, and we test every repair under actual home loads to ensure your backup power is reliable.
After repair, we test your generator under no-load, half-load, and full-load conditions. We verify automatic transfer switch operation and confirm sustained voltage and frequency under actual home circuits.
Annual maintenance prevents most generator failures. Our plans include fuel system cleaning, load testing, and early problem detection so your backup power is ready when you need it most.