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Ask Hank F. Your Own Question
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15279
Experience:  Certified on Onan and Generac generators
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On our generator all of the red lights are on and it trys to

Customer Question

on our generator all of the red lights are on and it trys to start but just bumps the starter a little i can't seem to be able to re set the computer
JA: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?
Customer: natural gas powered
JA: Do you plan on doing the work yourself?
Customer: if i can a while ago i replaced the overheat switch and i seemed to run fine for a couple of months
JA: Anything else we should know to help you best?
Customer: it is over 10 years old 15 kw
Submitted: 1 month ago.
Category: Small Engine
Expert:  Hank F. replied 1 month ago.

Hello, my name is ***** ***** I am going to assist you with this.

What are the brand, model and serial number of the genset?

Customer: replied 1 month ago.
it's bad weather here can't get that info till tomorrow i know it's 15 kv 1.0 liter kohler engine otherwise i'll talk to you tomorrow
Customer: replied 1 month ago.
can you diagnose it at all tonight?
Expert:  Hank F. replied 1 month ago.

It's pretty hard to diagnose when I don't even know what it is.

Are you positive it is a Kohler?

Kohler never made a 1L engine that I am aware of.

Customer: replied 1 month ago.
this is probably over 15 years old
Customer: replied 1 month ago.
i am sure
Customer: replied 1 month ago.
i'll run out and see if i can get the model number
Customer: replied 1 month ago.
item #(###) ###-####serial # 38989958 15000 watt @ 62.5 amps guardian series
Customer: replied 1 month ago.
right off the id plate
Customer: replied 1 month ago.
the engine may be something else i use a kohler oil filter that fits
Expert:  Hank F. replied 1 month ago.

This is a Generac genset.

You have an extra number in the serial number, but I won't need the correction.

The engine is a Generac 990 CC, GT990.

The lights are all on at the control board because you do not have your exercise timer set.

To set the exercise timer, set the switch to AUTO.

Press and hold the SET EXERCISE button until the genset starts (may take 10 seconds or so).

Once the engine starts, you must let it run until it shuts itself down (about 12 minutes). If you shut it off before it completes it's cycle, the timer will not set.

The timer will be set for whatever day and time you do this.

For example, if you set the timer at noon on a Friday, the unit will exercise at noon on Fridays.

If you set it at 10 PM on a Wednesday, the timer will be set for 10 PM on Wednesdays.

If the starter is not cranking the engine, the first thing you need to do is to check your battery cables to make sure the connections are clean and tight.

If the cables are not the problem, your battery is likely too weak to crank the unit. You would need to take the battery in and have it tested.

Do not rely on a voltmeter to test a battery, as even a bad battery can read fully charged with 12V, but not have enough ampacity to do any work.

Customer: replied 1 month ago.
thanks! I'll try to check the battery tomorrow however i can't set the exerciser because the generator won't start i did not check the battery so i'll do that tomorrow thanks that may be the problem!
Expert:  Hank F. replied 1 month ago.

Let me know how it turns out.

I let you know about the exercise timer so you wouldn't be trying to set it at 10 PM. Your neighbors might not like that.

Expert:  Hank F. replied 1 month ago.

Was it just a bad battery?