Base reads e4

The number usually indicates how many messages are stored! I think the memory is full so not allowing any more calls...... Delete the messages!

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.

e4 error code that means it ihas defective base unit. it happened due to a spike in the power lines that may cause this error

i know that you dont want to hear this but that means it must be replaced. you should be able to get a replacment form where you purchased the phone

E4 IS AN ERROR MESSAGE, THE BASE IS NO LONGER GOING TO WORK, POSSIBLY A POWER OUTAGE COULD OF DAMAGED THE BASE.

OK - sorted it finally!

If you, like me, had actually added water thinking that this would rinse the machine through... doh! you had inadvertantly made water fill the cavity at the bottom of the maching. This is situated behind the kick-board. There are 2 black plastic panels - if you remove these, (they just pop out) and sponge out the water that is activating the dip switch (there is a polystirene float) that activates the pump - this resolves the E4 error code.

Make sure you do it while the machine is off! The reason the base of the machine has filled with water may need further investigation, but mine was most definitely user error. Who'd of thought adding water to a dishwasher could have been so fatal! It nearly cost me £88 call out charge too after the helpline weren't able to help me.

check the sub code , it would read E4-? , such as E4-10 is fuser fan, E4-01 is low fuser temp, sometimes hold the print key after in code and sub code may appear. Then you can go to next step of repair.

Exact same problem. E4, sent uniden an email thru their website though I doubt Ill hear any response. Very disappointed as the 9485 was working great until all of a sudden E4 showed up.

Well, bad news! After taking my phone to Radio Shack and allowing them about 30 min. to identify the issue, the result was that an E4 error means a non-repairable internal problem. If the phone is less than a year old, and you have a receipt, it is covered by warranty.

Is the compressor running? I don't know this unit, but know that if you are too warm that is the first thing to check. In reading about another unit that had a different problem, it was mentioned that there is a ciruit board. If it has relays on it then these are the most likely culprit. They are either not making contact or staying in contact too long... sometimes just tapping each relay usually a black plastic component will cause it to work intermittently..Not sure if you can get these but call the company help line at 1-800-263-2629.