Hi Sebastián
It sounds like you are getting this red flashing LED warning because the system in your boat is detecting that your pump is drawing too much current. This error might occur because there is a fault in the detection system itself, or because there is a short-circuit in the boat wiring, or because the pump is dead.
I would advise checking the following:
* Check for a short-circuit or low resistance in the wiring to the pump
* Dissassemble the pump itself and check for water damage or other damage which may cause the fault. (The guides [guide|53903|here] and [guide|54044|here] may help)
It is very hard to diagnose an intermittent problem like this without actually seeing the system :)