I noticed a couple days before it stopped my subs were making like a humming noise. That noise would not stop so i just shut my stereo off because i didn't want it to ruin anything. Now when I Start my car my amp just comes on and goes right back off. Also when it comes on it makes my subs make a thump. Then it just goes off. I've heard of something like a safe mode but i don't know what that is all about.
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Mine did the same thing then I found the solution by accident. After reading a post about moving the sub to different positions and making sure connections were tight to the sub , I loosened the right speaker connection screws to the sub and noticed the humming stopped completely . I know it sounds crazy but it worked for me.
A few more questions-
Does the sub hum without anything plugged into it except for power? If it makes a real loud hum almost a squeal then I think the rca cable between the receiver and the sub is dead shorted and needs to be replaced. If it's more of a low level hum, then it's a ground hum caused by many things, ie........the receiver and the sub being on different power circuits in the house.......sometimes diconnecting the cable tv feed as it enters the room while the sub is connected and humming to see if it stops........the easy fix sometimes is using a 3 to 2 prong ac adapter but lifting the ground on such a powerful amp could be a fire hazard.
If the noise from the compressor sounds like a humming followed by a click, the compressor is "short cycling". Could be either the compressor relay or the compressor itself is bad. Not sure on the hissing noise. Could be just a loose panel that needs to be tightened or adjusted.
On your signal source, make sure you have the sub set to on.
If you can adjust the output setting on your source, turn this up.
Adjust the volume setting on the sub lower to mach the volume of the main speakers.
You may need to make these adjustments a few times to get them working.
On the hum and noise problem
Check your power outlet for the sub, make sure the polarity is correct. I have found this to not always be right. Also what is on that same circuit. Things like the fridge can cause a lot of noise on the power line. Next check your connecting cables, are they of good quality? Are they running next to anything that may cause interference? Also check you connections to the signal source. Cable and dishes are known for ground problems.
The fan motor must have been stopping. If the fan stops, for sure the fins will freeze because there is no air flowing.
common Fan motor problems defective bearing or bushing and starting condenser. If the bearing is defective, it will heat up and seize.
Have the fan motor checked.
The fact that the fins are freezing, means that there is enough freon and the compressor is working.