Click here for a listing of Technical Terms.


Unlocking the generator

The generator requires the use of a black “L” shaped wrench with a key on one end.  Insert the keyed end into the black lock and rotate the lock a quarter turn. With the latch released, the access panels can be removed, providing access to the control panel and engine compartments.

Contact us to purchase a replacement key.

Checking and adding oil

  1. We use a full-synthetic, All-Season automotive oil for all Generac generators we service. Do not use a different type of oil. Keep 1 or 2 quarts on hand, purchased at any local automotive store. To identify the correct oil type for your generator, reference Engine Oil Recommendations, Section 3-1, in the Owner’s Manual. Contact us for maintenance.
  2. Generac recommends checking the oil level monthly and every 12 hours of continuous operation. Check the oil level per section 10-1, in the Owner’s Manual. Set the Auto/Off/Manual switch to the “Off” position. Remove and wipe-off the dipstick. Re-insert it fully into the engine, remove it and observe the oil level indicated on the dipstick.  To locate the oil dipstick, see Maintenance, section 10-1, in the Owner’s Manual.
  3. Add oil only as needed. DO NOT FILL ABOVE THE “FULL” MARK. Overfilling could damage the engine. Engine oil capacity is dependent upon engine size. To identify the oil capacity for your engine, see Specifications, section 6-1, of the Owner’s Manual.

Alarm Message Indicators

  1. On a Nexusor Evolution control panel equipped generator, any alarms shutting down (preventing operation of) the generator, will be displayed on the control panel screen. To cancel an alarm, set the Auto/Off/Manual switch to the “Off” position, and press the “Enter” key. The alarm should clear and allow resumption of generator operation. See section 8-4, Alarm and Warning Messages, in the Owner’s Manual. When the alarm persists, contact us for service.
  2. Pre-Nexus control panel equipped generators, have LED indicator lights built-into the control panel. The status or fault is stated adjacent to the LED light illuminated.
  3. The GREEN LED is illuminated indicating “System Ready” (generator is ready to run). It confirms the control panel switch is set to “Auto”.
  4. A RED LED is illuminated when the generator has experienced a fault (failure). To clear a fault, place the Auto/Off/Manual switch to the “Off” position. Place the switch back in “Auto” or “Manual”, as desired. See Engine Protective Devices, section 4.1, in the Owner’s Manual.
  5. A YELLOW LED is illuminated when the generator is experiencing “Low Fuel pressure”. Check to see that the gas shut-off valve is fully open (gas valve handle is parallel to the gas piping).

Contact us with any service issues.


  1. Generac’s Standard warranty for the Guardian and Quietsource generators 60kW and smaller, is 2 years labor and parts.  The new Protectors series and QS Protectors series up to 60kW, have a 5 year limited warranty; 2 years labor, 3 years comprehensive parts and 5 years major parts components.  The large commercial series generators 70kW – 150kW, have a 2 year limited warranty; 1 year labor and 2 years parts.  The transfer switch is warrantied the same as the generator, provided it was registered with the generator at the time of activation.
  2. Generac offers comprehensive extended warranties of 5, 7 and 10 years.  Each warranty provides for labor and parts for the full term.  The extended warranty must be purchased within 12 months of generator activation.  A generator owner having an extended warranty, cannot upgrade to a longer term extended warranty.  Contact us for special pricing on these extended warranties.
  3. On any permanently mounted units, the warranty will transfer to the new owner, provided the unit stays in place.
  4. Accessory warranties are as follows:
    1. Battery heaters have a 90 day parts only, warranty.
    2. Wireless remotes have a 180 day parts & labor, no travel, warranty.
    3. Mobile Link has a one year warranty.

    (Reference WIB11-05-GALL)

Locating the model/serial number

Unlock and open the access panel of the generator enclosure. The data label is applied to the generator’s lower connection box.  The model number and seven digit serial number can be obtained from the data label. Reference section 2-1, Identification Record, in the Owner’s Manual.

Generator is running for no reason

  1. When you experience your generator operating (except during the scheduled 12 minute weekly exercise time), you may have a full or partial outage from ComEd. Check with a neighbor to see if they are experiencing a power outage as well. Contact ComEd at 1-800- EDISON-1 (1-800-334-7661). Reference section 9.1, Operation, in the Owner’s Manual.
  2. The main circuit breaker to your building or the generator panel circuit breaker has tripped or is switched off. In either case, the generator is responding to a loss of utility (ComEd) power. Reset the circuit breaker as necessary, to restore power.
  3. The generator system has failed. Contact us for service.

Where can I get an Owner’s Manual?

  1. You will need your seven digit serial number and model number.
  2. To obtain an Owner’s Manual, click on the link


Exercise time

  1. When the generator is switched to “Auto”, it will operate to exercise for 12 minutes each week, at the day and time you selected. The generator, when exercising will not interrupt the power to your building. On a Nexus or Evolution control panel equipped generator, enter the menu system using the “Escape” key. Then select the “Edit” category and navigate to the “Exercise Time” setting.  Reference section 8-3, Setting the Exercise Timer, and section 8-7, Menu System, in the Owner’s Manual. If you have Generac’s Mobile Link wireless remote, you can perform the exercise schedule change without accessing the generator.
  2. The Pre-Nexus controller found on the older generators requires the “Set Exercise Time” switch to be depressed at the exact day and time desired for exercise.

Setting the date and time

    1. On a Nexusor Evolution control panel equipped generator, enter the menu system. Using the “Escape” key, select the “Edit” category and navigate to the “Time/Date” setting.  Reference section 8-7, Menu System, in the Owner’s Manual. If you have a Mobile Link wireless remote, you can perform the Time/Date change without accessing the generator.
    2. Daylight saving time is not automatically adjusted by the generator control panel.

How many hours has it run

      1. On a Nexus control panel equipped generator, enter the menu system. Using the “Escape” key, select the “Status” category, followed by the “Display” category and finally “Engine Hours”. See section 8-7, Menu System Navigation, in the Owner’s Manual.
      2. On Pre-Nexus control panel generators, an hour meter located on the control panel will indicate the total running hours.

Testing the generator

The weekly exercise is beneficial in proving the operation of your generator in an idle or un-loaded mode, similar to your automobile idling in the driveway. In order to fully test the generator and the operation of the automatic transfer switch, it is best to perform a “Full System” test each season. This will subject the generator to an actual load test, proving its ability to perform and building confidence in its operation. The “Full System” test is simple to perform and requires 10 – 20 minutes, or as long as you desire. Follow the step-by-step procedures:

Complete facility or individual ATS –

      1. Switch off the service disconnect (circuit breaker) supplying the ATS.
      2. The generator will start after a 10 second delay.
      3. Once operating, it will connect your building circuits to the generator.
      4. Switch the service disconnect to “On” when you wish to end the test.
      5. After a 15 second delay, the ATS will switch back to Utility (ComEd) power. The generator will continue to run for 60 seconds to cool-down, and then shut off automatically.
        Contact us for assistance testing your generator.

Maintenance and Care

Maintenance requirements

  1. Generac states the scheduled maintenance requirements in section 11-1, Service Schedule, in the Owner’s Manual. The first required maintenance includes the replacement of the engine oil and oil filter, after the first 30 hours of operation or 3 months, whichever comes first. This is not a magic number, but a “best practice”. When experiencing a power outage with your new generator, it is best to check the oil level every 12 hours of continuous operation and maintain the correct oil level. Follow-up with the replacement of the oil and filter, as soon as practical. Contact us for all your service needs.
  2. Once the initial 30 hour or 3 month break-in service has been performed, the next service visit, requires a tune-up and oil change, every 100 hours or annually thereafter, whichever occurs first.
  3. Generators equipped with the Nexus or Evolution Controller will have “Maintenance Alerts” displayed on the LCD screen at yearly and hourly intervals, as noted per the Control Panel/Maintenance Alerts, section 8.6, in the Owner’s Manual. Once the maintenance item has been performed, press the “Enter” key to clear the alerts.

The Battery

  1. The Generac generator typically requires an automotive style, 12VDC, lead acid battery. Reference section 6-1, Specifications, in the Owner’s Manual to determine the correct battery for your generator.
  2. The battery must be maintained properly to ensure reliable generator starting. Reference your Owner’s Manual, section 10, Battery/Miscellaneous Maintenance.
  3. Proper battery maintenance is provided by our Factory Trained generator technicians, during all service and maintenance visits. We recommend replacing the battery at least every 4 years with the Generac recommended Exide battery. Contact us for battery replacement.

Snow & Debris

The accumulation of snow, leaves and other debris must not be allowed to obstruct the air flow into or the exhaust out of the generator enclosure.  Obstruction of proper air flow can cause overheating and shutdown the generator.


  1. Prevent ground water from rainstorms and flooding from submersing your generator and causing damage. When ground water is a threat, use plastic sheeting and sand bags to create a water barrier. A small sump pump with an integral float switch can be used to remove water from the containment area surrounding your generator.
  2. When flooding is a real concern, we can elevate the generator above grade to minimize the threat of water damage. Contact us for flood prevention options for your generator.
  3. When uncontrolled ground water rises above the black base frame of your generator; place generator in the “off” mode to prevent operation while submersed. Water entering the alternator section can cause significant damage.

Rodents and insects

During our scheduled maintenance visit, we will confirm the integrity of the access panel gaskets and the wire mesh screens located behind the enclosure louvers to prevent insect and rodent infestations.  The warranty does not cover insect damage to the controller.   Contact us for Scheduled Maintenance.


Wireless Monitors

  1. A new Cellular based wireless remote, Mobile Link™  is currently available and compatible with the Nexus™ & Evolution™ controllers. The communication link between the generator and your personal computer is accomplished through the Verizon cellular network. The user will be able to receive selectable alerts or messages via internet or text messages. In addition, the user can select messages to be sent to their local Generac Service Dealer. Contact us to have Mobile Link installed on your Nexus™ or Evolution™ control panel equipped generator. For other controller types, contact us for other monitoring options.Contact us to purchase Mobile Link™

What accessories are available

    1. Engine Coolant Heater – the thermostatically controlled heater maintains optimal engine oil temperature for more reliable generator starting in extreme cold conditions. It also reduces wear & tear on the starter, by promoting faster and easier engine starting.
    2. Battery Warmer – in addition to the heater described above, a thermostatically controlled battery warmer maintains optimal battery temperature to ensure faster and more reliable generator starting in extreme cold conditions. Contact us to purchase accessories.
    3. A surge protector provides the highest level of protection from ComEd system generated power surges as a result of storms and system faults. It protects your entire office or facility, by capturing and dissipating damaging surges (think of a power surge as a tsunami) at your main point of electric service from ComEd, before it travels throughout your building damaging computers, electronics and equipment.
    4. Generator owners concerned with flooding would be prudent to have at least two redundant sump pump systems. This includes two – full capacity pump’s, each on their own dedicated circuit. This is best for two reasons:
      1. When one pump fails and trips the circuit breaker, a second full capacity pump can take its place.
      2. When encountering a heavy storm, two – full capacity pumps are better able to keep up with the water flow.

Contact us for a free quotation.

    Please note: the section numbers listed in your Owner’s Manual may vary depending on the date of manual revision.