Disconnect the 12v from the amp and let it sit for a minute then hook it back up. This will reset protection. It needs to be completely disconnected from the car.
Check how the subs are wired. Make sure they are not wired to 1 ohm. that amp is not stable at 1 ohm. It is at 2 and 4 ohm. make sure the subs are not wired any lower.
the ohm load is the main reason for an amp going into protection.
You need to check the DC voltage across the B+ and ground terminals. You also need to check the DC voltage across the remote and ground terminals. If the voltage is less than 11 volts, you need to check the B+ supply and remote wiring for breaks or open fuses. You should also check the ground connection to confirm that it's not loose.
If the voltage is OK, the output transistors are likely shorted.
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