I have an avr 4800, and eveytime I raise the volume to -21 or higher it goes into protection mode. can you help? my zipcode is 60184

Question edited for clarity and full maker name.

See the link. It is a known issue.

https://www.google.com/search?q=Harman+Kardon+AVR+500.+The+volume+flashing+20db+then+goes+into+Protect+Mode

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Hi, This is because your unit goes in to protection mode because of some bad connection in the input/output section .Disconnect your spkrs,inputs..turn the volume is Down all the way and power it up,Check your wiring for shorts at the inputs and outputs. at your service sreejith

It only goes into protect mode usually when there are to manny speakers hooked up more then its can handle

most of the receivers come with a cooling fan inside see if its working they usually work when you turn the volume up,, if its working that means you are playing it to loud if you lower the volume a little it will play just fine..( if the fan inside is not working thats the reason it goes into protect mode and it means you must have it repaired,, it goes into protect mode to prevent furter damage to the unit or the speakers,,

Either there is a bad capacitor in the protection unit or you can find the wire that goes from volume control to protection unit and unplug it.
You can also try turning the volume all the way off before turning on, then slowly turn up from there

Do you still have the AVR1500? I have one with a bad tuner--and would be interested in purchasing your for parts. Let me know if you still have it and if you'd be willing to sell it.

HI check your speaker cables are not touching, also make sure "b" speakers are not on and that all your speakers are 4ohm or higher as this will cause the amp to shut down if they are to low an impedeance,The amp is protecting itself when it shuts down.

hope this helps.
CABLE GUY.

My AVR 5600 has worked flawlessly for nearly 9 years!

Suddenly, when trying to play music (DVD or CD) through my LS32's (JBLPro), once I achieve higher volume, the receiver cuts off.... Using a Symetrex mixer, NO OVERLOAD light on the Denon, it simply cuts off!

Re-cut all the wire connectors... TV movies (5.1) work great at normal listening volumes.... but tonight, when cranking up music, the receiver simply cut off. Blinking light...

HELP

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Eltax AVR-200 will start up in protection mode if the amplifer went into protection mode due to high volume before it was turned OFF and it will start at the same volume level as it had before power OFF.

To correct this you must shift to another input without signal, then turn the volume down before it goes into protection mode again.

It sounds like there is a problem with the differential circuit. The bias I am not sure about, as every unit is different. You should get the service manual to be sure or call Denon and see if they can give you an idea. Good Luck