"Denon AVR 2106 Protect Mode" Q&A from a couple years ago, as I have the same problem. tech48 gave a good "how to check the 3 most likely problems". I followed his instructions. My problem is apparently... "Reason 1 The receiver has a blown channel. This will require the replacement of many parts. The output transistors, supply resistors, driver transistors, and a capacitor in the driver circuit of the affected channel. It is usually the channel that is located closest to the display board on the main heat sink." Was hoping for some Denon Guru guidance

(1)Download AVR3310 service manual.
(2)enter debug mode to see what kind of protect it belongs to.
(3)DC or ASO protect
(4)DC protect to check all smd transistors if leakage occurs or
differential and voltage amp transistors leakage
(5)ASO see service nanual troubleshooting steps.
(6)Replace all defective components.

Hi amy, Your vivid description of the problem confirms that the protect circuit is cutting off the amp on detection of a high current drain. The possible fault is the failure of the Audio Power Output Mosfets. You will need to remove the mother board to test the stage and confirm to replace one of the stages.
The second possibility is that the protect circuit by itselff could be defective and cause a faulty bias to trigger the cut off. This must be checked by a stage by stage Voltage check.
Since the removal of the mother board requires some experience so as not to tamper the set , you must decide on the course of action.
The other option I can suggest is to call up the Denon call centre and check up the nearrest service centre, send and receive the set to them by courier after confirming the fault and estimated costs. If this justifies then it must be thought of.
I am sure you can search for one as I am not sure the place of your residence... try a search on the web for Denon service support with your location/city.
I hope my advice helps but please open the cover to have a look inside for visible damages.
Good day

Check your speaker wires on zone 2 and look inthe manual for speaker configurations with zone 2. you may have a speaker conflict. If you still have an issue, post a comment with your speaker setup and I'll help some more. Hope this helps

Normally when this happens it is because the impedence load is too small. This unit requires 8 Ohm speakers. If you connect 4 Ohm speakers, it will work, but work harder and generate excessive heat. If the heat is too much, the unit will enter protect mode and shut down. Once it cools off, it will work again. In your case, if the speakers are the correct impedence, check for crossed wires. If that is the problem, running the unit at higher volume levels should cause it to shutdown sooner.

Keep us posted,
Dan

THE BEST SOUND IS WHAT SOUNDS BEST TO YOU, HOWEVER DO THIS:
1, USING THE SETUP MIC CONFIGURE YOUR DENON, PAGE 8 OF THE MANUAL. NEXT
2. RAISE THE REAR SPKR LEVELS, PAGE 46,47. NEXT
3. WHEN LISTENING TO AUDIO CD OR RADIO TRY THE 5 CH STEREO DSP MODE.
4. WHEN WATCHING A DVD USE DSP DOLBY PROLOGIC OR TRY 5CH STEREO IF THE MOVIE IS MOSTLY TALKING.
5, TRY 5CH STEREO WHEN WATCHING PROGRAMS WITH MOSTLY TALKING

So you have no sound on any Inputs?  This makes a difference, if it works on some inputs but not others.  For a factory reset - turn the unit off by the ON/OFF button (not the standby button) hold in the SPEAkER A & B buttons at the smae time, while pressing them turn the system on by the ON/OFF button, wait about 3 seconds and the unit should reset everything.

Does it still power up for a little bit or so with no sound what so ever?....I there is no dents in it or metal pushed in causing cracked connector boards....I can take it off you hands for a couple parts I need ...because your transformer and 2 resisters are shot and it will cost almost as much as the unit cost's.

I do have a brand new never opend $649.99 Denon AVR-788 for $365.00.
And 2 used AVR units Denon and Onkyo.....ALL HDMI

call 630 742 6587

Denon AVR-810 was a quite out-dated model. I had owned since 1992. It shown 'Protection' on the screen for 2 months ago and not yet been fixed. Better to replace a modern one or repair it at a reasonable costs.

There should be a volume adjust on the center channel. This is done by the remote exclusively. You may also wish to compress the sound using the dynamic range compression button or so labeled.

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