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John
John, Engineer and electronic enthusiast for more than 12 years.
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When I power on my Denon AVR-391 it shuts off after a few

Customer Question

When I power on my Denon AVR-391 it shuts off after a few seconds and blinks red. What do I do to fix it?
Submitted: 1 year ago.
Category: Home Theater-Stereo
Expert:  John replied 1 year ago.

Hello. Welcome to Just Answer. Please allow me to assist you with your question today. I am John, I will do my very best to help you solve this problem.

The light comes on when the receiver’s current sensing and thermal monitors detect some unusual operating condition that, if left unchecked, might damage the amplifier. This can happen if there’s a dead short in a speaker wire or if you’re using very low impedance loudspeakers at high volume for an extended length of time.

Before turning the power back on, all speaker wire connections should be checked for their integrity at the receiver side and at the speaker side. If the protection light goes on immediately after you turn on the receiver, disconnect the speaker wires at the receiver side and retest. If the receiver's protection light goes off, then there would still seem to be a problem with one channel's speaker wires or speakers. Connecting them one by one and retesting should allow you to find the problem speaker or connection.

If after checking all your connections, the Protection indicator stays lit you may need to take your receiver to an authorized repair center for a diagnostic. If you found a problem with the wiring, then please try resetting it again.

Is your unit still in warranty by any chance?

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John

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