Hi Vinoth, if this has not been resolved I would advise you to disconnect the unit from the AC Outlet for at least an hour and then see if it is out of Protect Mode, Thanks, JT
SOURCE: Onkyo tx-sr800 PROTECT mode
Hold video1 and press speakers A button, it will say "clear" If the message protect appears again, then its service time.
SOURCE: Protection mode
I banged my head against the wall on this same issue and finally realized that my rear surround speakers were mixed. My rear right was wired to rear left because I was turning around to see L and R. It would shut off at about volume level 40, which was loud but not rumbling. It now ROCKS and is in no way a problem with heat. I have always run it with the cabinet open to allow air to circulate.
SOURCE: Onkyo Tx-v940 Receiver/Amplifier Protection Mode
Audio amplifier IC's damaged you need to change it.Good luck
SOURCE: stuck in protect mode
i believe protect mode is because you have the wrong impedence speakers, they are too low (4 ohm? 6 ohm?) it chols work with 8 ohm speakers
SOURCE: How can I reset my Onkyo TX-SR601? Hard reset...
Hold Video 1 and Press the power button then turn it back on i had the same problem
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