I called Uniden about the same problem. They say it is a code that means it is defective base unit. I had purchased it within one year and they will gladly send me a new one. I don't know if they will offer anything beyond the one year mark.
They say it was a spike in the power lines that causes this error.
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Your manual may have the E4 code, but Uniden certainly will, if you contact their support site. This symptom often indicates a power or function issue with the base unit, and so make sure the base has charging voltage, and the terminals are clean (use a qtip and alcohol). When you contact Uniden Support, have your model number ready, since different units can have the same or different error codes programmed into them.
Good luck, and hope this helps.
Error #4, You probably need to reset the phone by unplugging the main unit from the power source then plugging it back in abd re registering the handsets by setting them in the main cradle for about 10 seconds each. if this doesn't work try the manual if you have it still and see what E4 error means. Good Luck. Sometimes with electronics all you need to do when they wont work is unplug then and plug them back in while holding the power button on. This is amazing trick that no one wants anyone to know about. it works great on VCR's and DVD players.