Briggs and Stratton 20KW - Shuts down

Briggs & Stratton generator troubleshooting
Post Reply
Dave_
New Member
New Member
Posts: 1
Joined: Tue Jan 05, 2021 1:23 pm

I have a B&S 20Kw LNG/Propane standby Generator that will start and turn off after 5-6 seconds. After 5 attempts to start it will produce a code FC-4 for "engine fails to start". The generator seems to be sensing
a problem and wants to shut down. The LNG input has a gauge and measures slightly over 8" water column so I ti not low on fuel. The voltage measured coming from the generator at the breaker on the generator is on 70 volts when it is running for those 5 seconds. Does this mean the stator is bad? Is there a voltage regulator I can test? Could the circuit board be the issue? Anyone else have a similar problem?
Chris
Site Admin
Site Admin
Posts: 3304
Joined: Sat Aug 04, 2018 8:46 pm
Location: Clawson, MI
Contact:

Have you measured on both sides of the circuit breaker (generator side as well as load side)? These will show that fault if the breaker is off I believe as well, since they're measuring output voltage after the breaker for some odd reason...

It's likely a bad voltage regulator since you're making some voltage. We don't sell B&S parts, but with a model number we can probably help track something down for you.
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