Looking at the troubleshooting guide, it could be a few problems (all pretty standard when an amp goes in protect mode)
-The temperature inside the unit has risen. Please turn off power once, and re-apply the power after the temperature has fallen sufficiently.
• Please re-install this unit in a place having good ventilation.
– –
-The power indicator is blinking red in intervals of approximately 0.5 seconds.
• Please use speakers which have the specified impedance. • The speaker cable has shorted (is touching). Firmly twist the core wire in the speaker cable, and then re-connect it to the speaker
terminal.
-After turning on the power, the power indicator is blinking red in intervals of approximately 0.5 seconds.
• This unit amplifier circuit has failed. Turn off the power and please contact the DENON service adviser.
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