Emergency Generator Repair in Ontario: What to Do When Your Generator Fails

Your Generator Has Failed — Here Is What to Do Right Now

When your generator fails to start during a power outage, you need a clear plan of action. The steps you take in the first few minutes can determine whether the problem is resolved quickly or escalates into a costly repair.

This guide covers the immediate steps to take, the most common causes of generator failure, basic troubleshooting you can perform safely, and when to call for professional emergency generator service. If your generator has failed and you need help now, contact Ontario Generator Systems for 24/7 emergency repair service across Ontario.

Immediate Steps When Your Generator Fails

Follow these steps in order when you discover your generator is not running during a power outage.

Step 1: Confirm the Utility Power Is Actually Out

Before troubleshooting your generator, verify that utility power has actually been lost. Check whether your neighbours also have no power, or contact your local utility's outage map. In some cases, a tripped main breaker in your own panel — not a grid outage — may be the issue.

Step 2: Check the Generator's Controller Display

Walk to your generator and look at the controller panel. Most modern standby generators display status information and error codes on an LCD screen or through LED indicator lights.

• Green light / "Ready" status — the generator is in standby mode and should have started automatically. If it has not, the issue may be with the transfer switch rather than the generator itself.
• Yellow or amber light / "Not in Auto" — the generator has been switched out of automatic mode. Toggle the controller back to AUTO.
• Red light / fault code — the generator has detected a problem and shut itself down for safety. Note the specific error code displayed — your technician will need this information.
• No display / no lights — the controller has no power. This typically indicates a dead battery or a blown control fuse.

Step 3: Check the Generator Circuit Breaker

Standby generators have their own circuit breaker, usually located inside the generator enclosure. If this breaker has tripped, the generator may be running but not delivering power. Reset the breaker by switching it fully to OFF and then back to ON.

Step 4: Note All Error Codes and Symptoms

Before making any further attempts to start the generator, document everything you observe:

• The exact error code or fault message displayed
• Whether the engine is cranking (turning over) but not starting
• Whether the engine started and then shut down
• Any unusual sounds, smells, or visible leaks
• The position of all switches and breakers

This information is critical for your technician and can significantly reduce the time required for diagnosis and repair.

Common Generator Failure Causes and Troubleshooting

Understanding the most common reasons generators fail helps you determine whether the problem is something you can address or whether professional service is required.

Battery Failure

The most common cause of generator failure is a dead or weak starting battery. The battery powers the starter motor that cranks the engine, and it also powers the controller that monitors utility power and sends the start signal.

#### Symptoms

• No response when the generator should start — no cranking, no display, no lights
• Slow or laboured cranking that fails to start the engine
• Controller display is dim, flickering, or blank

#### What You Can Do

• Check battery connections — loose or corroded terminals can prevent the battery from delivering power. If safe to do so, tighten the terminals or clean visible corrosion with a wire brush.
• Check battery voltage — if you have a multimeter, measure the battery voltage. A fully charged 12V battery should read 12.6V or higher. Below 12.0V, the battery likely cannot crank the engine.
• Check the battery charger — the generator's built-in charger should maintain the battery. If the charger has failed, the battery will gradually discharge between exercise cycles.

Battery failure is preventable with regular testing and proactive replacement every 4-5 years. If your battery is more than 3 years old and your generator has failed to start, the battery is the most likely culprit.

Fuel Supply Issues

A generator cannot run without fuel, and fuel supply problems account for a significant percentage of emergency service calls.

#### Natural Gas Generators

• Verify your gas meter is on — in rare cases, utility work or an unrelated event may have shut off your gas supply
• Check other gas appliances — if your furnace, water heater, or stove also have no gas, the issue is with your supply, not the generator
• Check the manual gas shutoff valve at the generator — ensure it is fully open
• Inspect the gas line for any visible damage, especially after severe weather events

#### Propane Generators

• Check your propane tank level — if the tank is empty or nearly empty, the generator cannot run. In cold weather, propane pressure drops, and a tank that reads 10-15% may not deliver sufficient fuel.
• Check the tank shutoff valve — ensure it is fully open
• Inspect the regulator — ice buildup on the regulator during winter can restrict fuel flow
• Verify the tank service valve has not been accidentally closed by a fuel delivery driver

Transfer Switch Problems

If your generator starts and runs but your home remains without power, the problem is almost certainly in the automatic transfer switch (ATS).

#### Symptoms

• Generator is running at normal speed but no power in the house
• Some circuits have power but others do not
• The transfer switch is making unusual clicking or buzzing sounds
• The transfer switch display shows a fault or error code

#### What You Can Do

Transfer switch problems require professional diagnosis in nearly all cases. The ATS contains high-voltage components and a mechanical transfer mechanism that should not be handled by anyone other than a licensed electrician. Do not open the transfer switch enclosure or attempt to manually force the transfer mechanism.

If your transfer switch has a manual override lever (many models do), consult your owner's manual for the proper procedure. Manual transfer is designed as a last resort and should be performed only if you are confident in following the manufacturer's instructions exactly.

Engine Fault Codes and Safety Shutdowns

Modern generators monitor dozens of operating parameters and will shut down automatically if any reading falls outside safe limits. Common safety shutdowns include:

#### Overcrank

The generator attempted to start multiple times but the engine failed to fire. Causes include a dead battery, no fuel, flooded engine, or failed ignition component. The controller will display an "Overcrank" code and lock out further start attempts until the code is cleared.

#### Low Oil Pressure

The engine's oil pressure sensor detected insufficient oil pressure. This shutdown protects the engine from catastrophic internal damage. Never override a low oil pressure shutdown. Check the oil level — if it is full and the generator still shows low oil pressure, the oil pressure sensor or pump may have failed, requiring professional service.

#### High Temperature

The engine or alternator has exceeded safe operating temperature. Causes include blocked airflow (debris on the radiator or around the enclosure), low coolant (liquid-cooled models), or a failed cooling fan. Allow the generator to cool completely before attempting a restart. Check for obstructions to airflow and verify coolant levels.

#### Overspeed / Underspeed

The engine RPM is outside the acceptable range. This typically indicates a governor failure, fuel delivery problem, or mechanical issue. This fault requires professional diagnosis.

#### Overload

The generator detected an electrical load exceeding its rated capacity. This can happen if a large motor starts while the generator is already near full load, or if there is a short circuit on one of the load circuits. The generator shuts down to protect itself and your home's wiring.

When to Call a Professional

Some generator issues can be resolved with basic troubleshooting. Others require a trained, licensed technician with diagnostic equipment and replacement parts.

Call for Emergency Service If:

• The generator displays a fault code you do not recognize — attempting to clear and restart through unknown faults can cause further damage
• The generator is leaking fluid — oil, coolant, or fuel leaks are safety hazards that require professional attention
• You smell gas — a natural gas or propane leak near the generator is an immediate safety concern. Move away from the area and call your gas utility's emergency line first, then call for generator service.
• The generator started and then shut down repeatedly — repeated shutdowns indicate the generator is detecting a real problem. Forcing it to continue running risks engine damage.
• The transfer switch is not functioning — high-voltage transfer switch components should only be handled by a licensed electrician
• The generator has not been serviced in over a year — a neglected generator that fails during an outage likely has multiple underlying issues that require comprehensive diagnosis
• You are uncomfortable performing any troubleshooting step — there is no shame in calling a professional. Generator systems involve electricity, natural gas, and mechanical components that can cause injury if handled incorrectly.

Ontario Generator Systems' 24/7 Emergency Service

Ontario Generator Systems provides around-the-clock emergency generator repair across Ontario. When you call our emergency line, you will speak with a generator specialist — not an answering service — who can walk you through immediate steps and dispatch a technician to your location.

Our emergency service includes:

• Immediate phone-based troubleshooting to resolve simple issues without a service call
• Priority dispatch for generator failures during active power outages
• Fully equipped service vehicles carrying common parts including batteries, filters, spark plugs, fuses, and control boards
• Licensed and insured technicians qualified to work on all major generator brands
• Transparent pricing — we provide cost estimates before performing any repair

Customers enrolled in our maintenance plans receive priority scheduling and discounted emergency service rates.

How to Prepare Before the Next Outage

The best time to address a generator problem is before an outage occurs. Taking proactive steps now dramatically reduces the likelihood of a failure when you need your backup power most.

Schedule Preventive Maintenance

If your generator has not been serviced in the past 12 months, schedule a maintenance visit immediately. A professional service includes a full inspection, oil change, filter replacement, battery test, and load test — addressing the most common failure points before they cause a problem.

Replace Aging Batteries Proactively

Do not wait for your battery to fail during an outage. Generator batteries should be replaced every 4-5 years regardless of their apparent condition. A battery that passes a simple voltage test may still fail under the high-current demand of cranking a cold engine.

Keep Your Fuel Supply Reliable

• For natural gas generators, ensure your gas service is active and has not been downgraded
• For propane generators, set up automatic fuel delivery to prevent running out. Maintain a minimum tank level of 30% year-round.

Monitor Your Generator Remotely

Most modern generators offer Wi-Fi or cellular monitoring through a manufacturer app (such as Generac's Mobile Link or Kohler's OnCue Plus). These apps send real-time alerts to your phone if the generator detects a fault, completes an exercise cycle, or experiences any status change. Enable these alerts so you can catch problems early — before the next outage.

Keep a Generator Emergency Kit

Prepare a small kit near your generator with the following items:

• Owner's manual — for reference during troubleshooting
• Flashlight and batteries — for nighttime troubleshooting during an outage
• Basic tools — a socket set, adjustable wrench, and screwdriver set compatible with your generator's enclosure fasteners
• Battery terminal cleaner — a wire brush or terminal cleaning tool
• Multimeter — for checking battery voltage
• Emergency contact numbers — Ontario Generator Systems, your gas utility, and your electrical utility

Build an Emergency Power Plan

Every household should have a plan for extended power outages, even with a generator:

• Identify your most critical loads and know which circuits are connected to your generator
• Have backup communication — a charged cell phone with a car charger, or a battery-powered radio
• Stock emergency supplies — water, non-perishable food, medications, and blankets in case your generator requires repair during an extended outage
• Know your generator's fuel autonomy — how many hours can your generator run on its available fuel supply? For natural gas, this is effectively unlimited. For propane, calculate run time based on your tank size and generator consumption rate.
• Establish a communication plan — know how to reach your generator service provider, utility company, and emergency services

The Cost of Delayed Repairs

Putting off generator repairs is a gamble with steep consequences. A minor issue that costs $150-$300 to repair today can escalate into a major failure costing $1,000-$3,000 or more if left unaddressed. More importantly, a generator that fails during a winter storm can result in:

• Frozen and burst pipes — repair costs of $5,000-$15,000 or more
• Basement flooding from a failed sump pump — $5,000-$25,000 in water damage
• Food spoilage — $500-$2,000 in lost refrigerated and frozen goods
• Displacement costs — hotel stays, meals, and transportation if your home becomes uninhabitable
• Health risks — cold exposure, heat exposure, or medical equipment failure

The cost of timely generator repair is a fraction of the cost of the damage an unprotected outage can cause.

Comprehensive Generator Diagnostics

When basic troubleshooting does not resolve the issue, a professional diagnostic service identifies the root cause through systematic testing:

• Electronic diagnostics — reading and interpreting controller fault logs, which store a history of every event and error the generator has experienced
• Electrical testing — verifying voltage output, frequency stability, winding resistance, and insulation integrity
• Mechanical inspection — compression testing, valve adjustment check, and bearing condition assessment
• Fuel system analysis — gas pressure measurement, regulator testing, and fuel valve operation verification
• Load testing — verifying the generator can deliver its full rated output under sustained load
• Transfer switch diagnostics — testing the ATS controller, sensing circuits, and mechanical transfer components

A thorough diagnostic identifies not just the immediate failure, but any underlying conditions that could cause future problems. This approach prevents the frustrating cycle of repeated failures and emergency service calls.

Act Now — Don't Wait for the Next Outage

Whether your generator has already failed or you want to make sure it does not, the time to act is now. Ontario's storm season does not wait, and neither should you.

Ontario Generator Systems provides emergency repair, diagnostic services, and preventive maintenance for all major generator brands across Ontario. Our licensed technicians are available 24/7 for emergency calls and can be reached immediately through our contact page.

If your generator is running but you are not sure it is ready for the next outage, schedule a free site inspection. We will evaluate your system, identify any issues, and provide a clear plan to ensure your backup power is reliable when you need it most.