Error code 1603-underspeed

Find out who we are & why we're here!
Post Reply
Cisco
New Member
New Member
Posts: 1
Joined: Wed Mar 03, 2021 2:31 pm

I have a generac 22kw evolution home generator. It is natural gas with a transfer switch. I have it set to run for 30 minutes once every 2 weeks. Lately, I have been getting an error code 1603-underspeed. It is 1.5 years old. I can't seem to find any material on the solution to the problem. Does anyone have thoughts?
Chris
Site Admin
Site Admin
Posts: 3824
Joined: Sat Aug 04, 2018 8:46 pm
Location: Clawson, MI
Contact:

The first odd thing I notice is that these won't run 30 minutes for an exercise, only 5, and that duration isn't changeable.

The underspeed is telling you that the engine isn't running fast enough. That is usually fuel related or a stepper motor issue. When you put the unit into Manual mode, do you see the throttle sweep back and forth before it cranks?
Generac tech for over 12 years. I'm here to help!
"The only source of knowledge is experience" -Albert Einstein
Looking for Generac parts? Gentek Power offers the full line of Generac replacement parts! Shop Gentek Power Generac Parts
A list of my favorite Generator & Electrical Tools! https://www.amazon.com/shop/gentek_power
Post Reply