The problem is a Signal Switch Malfunction. It has to do with the power switch and the pressure switch from what I have been able to find out. Mine doesn't have a pressure problem it just goes to E4 once you set the time. I gave the switch a good smack and it has been working for a while. This is the second time and this worked both times now. I am sure the switch will have to be replaced at some time. From what I have seen this is a very common problem.
There is one way to fix this problem, albeit not the best.
I was able to bypass the E4 error by completely bypassing the electronics and wiring the heater coil to get power whenever the pressure cooker is plugged in. It was a very simple job, anyone with any electrical experience can do this.
The only problem is that it is a safety concern as there is no way for the heater to turn off even if pressure is getting to be way too high. There may be a pressure relief valve in the lid but the heater coil won't shut off, so don't leave it unattended! But at least this way to you can still pressure cook.
Pics of process:
http://s909.Photobucket.com/albums/ac295/danwat1234/fixing%20the%20pressure%20cooker/
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