First the display is showing check SP wires, I've checked the speaker connections and it seems to be fine then I tried to power it on again it will only stay on for one or two seconds the it will shut itself down.
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Probably the speakers are not wired correctly. Check this by turning on the receiver without speakers connected. If the message is gone, issue was in the connection of speakers. Check that you have not short-wired the + and -.
My guess, guess, check CLOSELY the SPeaker wires - "Check SP wire" make sure all of the bare portion of the wire is into the terminal. No bare wire touching another bare wire both at the receiver and at the speakers. Also, if the wiring is not continuous, check all connections of speaker wire. Disconnect all but one, play it like that. If no problem, label that as good, disconnect another for several days, when one shuts Rec. off, check wires closely for that speaker.
If you have bare wire going into the receiver's output terminals, make sure a strand or two of wire is not touching the other terminal. That can short out the outputs, especially when you turn up the volume, which increases the voltage present at those terminals. That would cause the receiver to shut down as a saftey precaution.
I have the same problem as you but no thunderstorm. Mine happened after I connected speakers with the unit operating and had a speaker wire short at the back of the unit. Got a whiff of smoke and now I have that DSL1U unit clicking same as you. Did anyone suggest a fix?
That is a check the speaker wire error, caused by a short or perceived short. If you look at the back of the receiver you may see 1 strand of the wire loose, they are very hard to see sometimes. You may use banana plugs as it is painful to get everything hooked up without a few loose strands.
If there is still the issue check your speaker connections for the same issue. If they are in ceiling/wall speakers disconnect them all then plug them in one at a time to narrow it down.
If the issue persists perhaps one of your speaker wires has a short somewhere, could be a misplaced drywall screw from hanging a picture, or a carpet tack strip, or a pet deciding it was a nice chew toy.
If you are completely sure it is none of those then I would say it is a bad speaker or receiver. Try changing in and out known good speakers/receivers if you have access to them to see which one it is.
found the source of the problem with "Check SP Wires"! to solve it is necessary to check each speaker connected to the device Yamaha on the rear panel (red and black) using the device for determining the number of ohms, which shall not be less than 4 ohms, in large passive speakers experienced in Amfitone AU-027, the result showed that left at 0.45 (7) ohms, and the right-hand column, as such, no. The successful test ... and good music!