Power failures can happen for a number of reasons: bad weather, an overloaded power station, or even damage to transmission lines. Whatever the reason, many businesses and government organizations put backup generators in place to ensure normal operation can continue while the issue is resolved. Depending on the situation, loss of power can be incredibly detrimental to service delivery or productivity.


Generators are crucial for providing an ‘insurance policy’ in case of power failures, and they also offer some peace of mind. But the last thing anyone wants is for a generator to fail as well! That’s why it is so important for generators to undergo regular maintenance to ensure all their systems are in good repair and functioning properly.

With that said, here are our top 10 reasons that generators fail—and some tips for what you can do to address the risk in the meantime:.

1. Problems with the Battery System

Based on our experience, close to half of all emergency generator failures are caused by problems with the battery. Routine battery maintenance is important for good performance. Connections need to be cleaned and tightened. You should also note the service life of your batteries and replace them proactively. Towards the end of its life, a battery will provide closer to 80% of its designated capacity. Periodically checking the circuit breaker on the battery charger is also recommended, as this is a frequent cause of battery failures.

2. Controls Not Set for Automatic Operation

Although it may seem obvious, one issue that we see frequently is the master controls for the generator not being set for “Auto” (automatic operation). This can also occur when the emergency stop button is pressed. Building the habit of double-checking the master control set is a great way to prevent failures.

3. Overheating from Cooling System Failures

Cooling systems failures are most commonly caused by worn-out hoses and drive belts. Both should be regularly inspected to ensure they are working properly and set at the correct tension. Another component that needs inspection is the radiator core. Radiator cores can become plugged, either from dust and debris or as a result of corrosion and dirty coolant. Monitor the coolant to assure cleanliness and correct chemical balance, then perform a visual check to ensure plugging does not cause overheating.

4. Water Contamination or Lack of Fuel

Don’t let water get into your fuel supply! Water or moisture in fuel can easily damage diesel engines or impact their overall performance. Keep your fuel tanks topped up and use fuel stabilizers to protect the diesel from water contamination. Take a fuel sample regularly and inspect for discoloration or abnormal smell. Remember to monitor the fuel levels consistently as well. It’s another obvious tip, but being proactive about topping off your tanks will ensure you do not find yourself in a panicked situation as your generator is about to shut down!

5. Switchgear Problems

Switchgear or automatic transfer switches (ATS’s) contain moving parts that need to be inspected during maintenance. Issues with switchgear are commonly the result of some kind of mechanical failure. Parts can seize if they are left in one position for too long, so monthly testing is recommend.

Read about the next 5 reasons that power generators fail here.

Top 10 Reasons That Power Generators Fail