Eu 2000 no output power overload light on with nothing plugged in

Bad battery connection most likely.

old gas or water drain system replace gas

Yes,internally there is two fuses. always arround 30 Amps. change it. there are like automotive fuses, plug in type.

if no power on the plugs check for the cercuit breaker fuses and check for your load why it is tripping the circuit breaker the unit sbould not be overloaded

Sounds like you have a inverter fault.

Check the Ground Fault Indicator circuit breaker for triping, and look for the high limit on generator. Reset the main breaker by triping it full right and then back. Vitally

Yes, it is a switching power supply meaning that it automatically detects 120v (US) or 240v (EU) voltage. The only thing you might need is an adapter to convert the actual plug in from US to EU standards; they can be picked up for just a few dollars.

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First of, be sure volume is turned all the way down before or as you are powering it it.
Second if that does not work disconnect all speaker, and input/outputs.  Power the device on and see if it says overload.
If it does skip the rest of these steps, your capacitors are bad or the power supply is no longer functioning correctly.
If it doesnt, start with testing each speaker at power up.  Match the speaker to the output it goes on, power the device see if it says it. 
If it does on any speaker test it is a speaker issue or a terminal issue.  To test for terminal or speaker issue plug a different/ known to work speaker in that same terminal, if it doesnt say overload it is a speaker issue, if it does say overload it is a terminal issue.
Once you have made sure all speakers and terminals work correctly start plugging input and outputs in and test individually.

Ther clicking is probably coming from a relay and it is cycling because either the power supply itself or possibly an audio output power module has failed, the latter will overload the power supply so it tries to protect itself by interrupting either the AC or a DC voltage supplied by it.
This problem will likely require the hands-on of technical help. 

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The power supply of the lp640 has a protection derived by the functions of TOP 2XX witch in overload stops. therefore disabling the shorted output.
Verify the state of the fuses also.

Good luck out there ,