A standby generator may fail to produce power because it is not starting or running properly, its output is not being generated or delivered, a control or sensor has shut it down, or the transfer equipment is not working. Because the cause can be in the engine, the generating unit, the controls or the electrical connections, the system needs to be diagnosed rather than guessed at.
Here are the main areas that can be involved. A generator that runs normally while the house stays dark is a narrower problem with its own set of causes.
The Generator May Not Be Running Correctly
Some standby generators do not start at all, while others start and shut down. Common reasons include a weak or failed battery, a fuel supply problem, a low-oil shutdown, an overheating shutdown or an engine fault. These are mechanical or engine-side issues rather than electrical wiring problems.
Many controllers display fault codes or warning lights that point to the type of problem. Note what the display shows before calling for service.
Output and Electrical Protection
A generator can run but produce little or no usable power. Possible causes include a tripped generator breaker, a fault in the generating unit, damaged output connections or a problem with voltage regulation.
The generator’s own breaker is designed to trip when there is an overload or fault. If it trips repeatedly, the cause should be found rather than reset over and over.
Controls, Sensors and Settings
Standby generators rely on controllers and sensors to decide when to start, how to run and when to shut down. A controller set to the wrong mode, a sensor fault, a communication problem with the transfer switch or a failed control board can prevent the system from supplying power.
Maintenance-related problems can also affect operation. Missed service, old fuel, clogged filters or a battery near the end of its life can all cause failures, especially during a long outage.
Getting a Professional Diagnosis
A professional can check the generator, its controls, its output and the electrical connections to find where the problem is. Some work is electrical, such as connections, breakers and transfer equipment, while other work is mechanical, such as the engine and fuel system. Both may be needed for a complete repair.
Do not open the generator enclosure while it is running or try to work on its connections, and never connect a generator to the home in an improvised way while waiting for repairs. Fuel-burning generators also produce carbon monoxide, so keep them outdoors and away from windows and vents.
Standby generators across Utah may sit idle for long periods between outages, so problems sometimes show up only when power is needed.
If your standby generator in Salt Lake City is not supplying power, our professional generator repair can diagnose the system and explain what needs to be fixed.