Turned my Crown Xli 800 amplifier on and fault lights turn on for 5 seconds, then turn off, but no sound will come out. Not sure what's causing the problem.

SOURCE: sound cuts when volume is turned up

check that power amplifier rating(how many watt)must be more than total speaker rating by 20% at least..
exampel:if speakers watts are 100 watt-amplifier watt must be 120 watt.

SOURCE: gem sound amplifier #exa 1005

please disconnect your speaker from amp first-if fault goen connect your speaker one by one until you find the bad one-check the cable first and change it with new one and then change the speaker-if the fault still you will have a problem in your amp itself.

SOURCE: I have a Crown CE1000 power amplifier. I turned it

Unfortunately Crown amps are not the easiest to repair as they utilize multiple levels of amplification. Since you saw a flash, a resistor probable smoked, I would recommend that you bring this to an authorized service center.

Dan

SOURCE: blinking red fault warning

timy check the speaker conections before condeming the amp

SOURCE: Power not running constantly through amplifier

You might check your ground cable for poor connection. If it is attached to the painted chassis of the automobile, the paint needs to be scraped off a little. Or go to a local audio shop or Walmart and buy a cheap capacitor. It is supposed to hold power in itself providing the amp constant power for just this reason.