Nordictrack E4.1 It does not stop beeping and the buttons do not work.

SOURCE: NordicTrack Z7xi treadmill console buttons not working

Hello there. It sounds as if you may have a button stuck on your console. Thus not allowing any other buttons to be pushed. (i.e. the 4 beeps). This is usually caused by the i-fit buttons (silver buttons on the front). If the machine is only 4 months old you should still be under warranty (1 year) I believe. This problem in most instances requires the console be replaced. You can contact nordictrack through iconservice.com or by using the number on the fron of your users manual.
Good Luck! Tim

SOURCE: Nordictrack Commercial 1500 treadmill w/working display BUT unresponsive buttons

Sounds like a cable harness is undone. The cable feeding the panel which has the computer inside (the power feed) is connected, but the cable from the panel back to the motorized parts isn't. The breakaway is a separate circuit that cuts all power to everything. These are my assumptions (I'm not a nordic track expert), but it's a pretty safe bet, likely the connector in the bottom section. Okay, I just looked it up, first Google "nordictrack 1500 manual" one of the first links is a PDF, with a complete parts breakdown. Depending on your specific model, it looks like there is a connector under the top panel where it meets the right post (and a couple of screws will let you lift it up to check it). It may be partially unplugged, check that first since it looks pretty easy to check.
But I think it's going to be in the bottom, in the bottom of the treadmill the wiring splits to different sections. The motor/incline controller cable (a separate cable #106 on one model I looked up, something like NTL09707 or similar) is probably the one that is either broken or unplugged. So although the computer (up top) is sending signals, they aren't reaching where they need to. Anyway, get that manual, and someone handy with screwdrivers and technology, and they should have it figured out quickly.