Have you got the right type of speakers connected to the unit? Because if the speakers can not take the power out of the unit on high volume, the system will shut it down to prevent overload. The speakers should be able to take the full power of the amp. For example it will be no use connecting 30 watt speakers to a 40 watt amp. You can of course use 30 Watt Speakers, but you can NEVER turn the volume control much pass 70%.
If the amp can deliver say 40W you need speakers of 40W or greater. Also never connect speakers that have a lower ohms rating than the stated. So if it says 8ohms on the amp you can connect 8ohms or greater speakers. Never connect 6ohms type speakers.
SOURCE: Receiver goes into protect mode when hitting certain volume level
There is a problem in one of the output channels of the amplifier. That is the only reason it will do this. I work at an authorized Denon service center and have seen this problem several times, but it has never been the same thing that causes it. It has always resulted in extensive troubleshooting to find the problem. One time it was a capacitor in the pre-driver circuit for one of the channels, another time it was a transistor in the same type of circuit. I can not remember all the other causes. But without the proper tools and the knowledge of how to troubleshoot an amplifier circuit you will never figure it out.
Since this is an older model, more than 3 years old, it is no longer under warranty. They get a 2 year warranty from Denon. You can take it to any service center that works on stereo equipment and they should be able to fix it for a reasonable fee. Probable around $125 to $150 depending on their rates. It may seem like a lot, but it is much cheaper than buying a new one.
Since this is really the only option for you, unless you have the tools and knowledge, a FixYa! would be much appreciated and appropriate.
If you would like to troubleshoot it yourself, let me know, I have the service manual in PDF and can email it to you if you like and help you with troubleshooting it. But be aware, it is not an easy job.
Dave
SOURCE: When volume goes high, the system goes in protection and relay's clik is heared
This is not the fault with remote control. Check the load connected to the device. If overload occurs, the device will itself go to protect mode. Disconnect speakers one by one and check which speaker box causes the system to go to protect mode, when volume is incresed. Check that speaker for short.
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