Unfortunately, the E4 error is an internal hardware failure. You can try to reset the unit by unplugging the base station's power supply. Remove the phone line cord from the base. Finally remove the batteries from all of the handsets. Wait at least 15 minutes before you reconnect the power, batteries and telephone cable. Place one handset on the base. Wait one minute and check if the phone works.
If you see a message about searching for the base or out of range, then the problem is probably with the transmitter/receiver in the base. In any case, if the TRU9485 is still under warranty (one year), contact Uniden. Otherwise, replace the cordless phone system.
I hope this helps.
Cindy Wells
SOURCE: E4 trouble condition comes up on screen after power up
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.
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