Power source voltage is too high (aka above 14.5V).
The easiest thing to do is to try removing the connections to the speakers at the amp and see if the issue disappears after each set has been disconnected. Keep removing wires until both LEDs stay blue.
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If the blue light is flashing it means the output mosfets are taking more than what the power supply can deliver. Probably just one of the MOSFETs is bad. Take off the heavy aluminum bar that is the heatsink for the 8 MOSFETs. Turn it on for about 10 seconds. (And see that the blue light is flashing.) Find the (hopefully) one MOSFET that is hot. Replace it. And you're good.
Disconnect all speaker leads from the PDXf4 - test. If the amp turns on and says on ok - then turn off, and attach one speaker lead at a time until it turns off. When it does check that speaker and the speaker wire to see if it is blown, shorted out etc.
The most likely suspect would be an internal fault on the Alpine PDX-1.1000. So other than verify the 2 ohms per speaker using a continuity tester (DVM / VOM), all others involve opening the Alpine amp to effect repairs.
Options then are: to consider a DIY (do-it-yourself) repair if and only if you're very familiar with electronic components & circuitry, use of a DVM/VOM and a soldering iron/station.
Access to a Service Manual or at the very least, a schematic diagram would be a necessity (although a challenge in itself) as detailed procedures, test points diagnosis flowchart would be outlined though should you be uncomfortable with a DIY, perhaps your best bet would then be to seek the services of an authorized Alpine Service Center (specially if still under warranty) or a qualified professional.
Now referring to http://www.fixya.com/support/t1817194-stuck_in_protect_mode_phoenix_gold_ryval
"1. Does your amp have a high input port? This is where instead of RCA's you feed it speaker output from your head unit? 2 If so try this and see if the magic happens.. If it doesn't your screwed and the problem is internal most likely in the input stage and that's why your having to "fool" the amp. 3. Also take off the remote turn on wire and make a short little jumper from the remote turn on to the B+ on the amp. Yeah the amp will blaze on but see if it changes the output."
ur speakers are probably connected wrong so diconected and and connected differently. and if ur speakers a dual coil see if they connected it if not do this. only if ur speaker is double coil meanin if ur speaker has 4 connections for speaker wire. and if it does than connect possitve to negative from one coil to another and negative to positive from the other one than from one of the coils connect the wires going to ur amp positiv to positiv and negative to negative bringind the sub to 2ohm constant try that see if it works. only if u have a double coil subs
Solid red indicates 4 possible conditions: 1) Short circuit, 2) Current too high, 3) Voltage too high, or 4) Overheated. The most common faults are the short and overheated.
If the fault is intermittent, the amp is probably overheating. If it is a constant fault, anytime the amp is powered up, then I'd recommend that you first check all of the wiring. If the wiring is OK, then you have a voltage or current problem. If it's voltage, the vehicle electrical system is probably causing it. You can check that with a meter. It should be from about 12VDC with the engine off, to about 15VDC with the engine running (alternator putting out). The amp should be able to operate OK up to about 16VDC but as components age, their values change. I'd look for a minimum of 10.8VDC and a maximum of 14.8VDC.
If the problem is overcurrent, the amp itself probably has a defective component causing it to draw too much current. It needs professional repair.
well you would have to look into the ohms of the amp compared to the ohms of the speaker. If the ohms are different you would have to hook them up in a different way. check the RMS on the speaker as well as the amp, this can also be sufficed by wiring it different if ohms match up properly! Hope this helps you out and if this is not the case let me know.
If you set the gain too high on the AMP, at loud volume levels some clipping or distortion of the output signal will occur. Most amps have a Circuit inside that detects this clipping or distortion and applies protection to prevent damage to the speakers and the amp. It would help to know if you are driving the speakers with a Line level output or using the speaker output from your deck. There are many things that can cause an amp to go into protect mode, and knowing a little more about your setup will help to solve the problem.