I have a model dwsr483eb1ww ge dryer that will start and run as long as hold the start switch. when start switch is released it stops.what would cause this?

you have a bad belt switch,if the dryer stays running while you hold the start button on and stops when you release the button its the belt switch part WD21X10261 i've seen this a few times,go here and look at part 803 this is the bad part.
www.searspartsdirect.com/model-number/DPXR473EW0WW/0432/0151200.html

What you describe is either a failed evenheat board or a failed motor relay.
Please post the complete model number from the machine and I can help you narrow it down. There should be a wiring diagram inside the console with voltage checks also.
Thanks/Mike

Maytag Dryer Won't Start - Testing the Start Button - YouTube

? 1:26
https://www.youtube.com/watch?v=gJwYV8HkTbk
Oct 7, 2013 - Uploaded by Bill Newberry
This video shows you how to test the start button on a MaytagDryer. ... dryer medc200xw0 will not keep running after releasing the start button.

GE Dryer won't stay on after turnin

Dryer won't continue running when start button released ...

forum.appliancepartspros.com > Appliance Repair Help > Dryer Repair

Jul 25, 2014 - 3 posts - ‎2 authors
When I push and hold the start button the dryer motor starts and heats. It will not continue to run when I release the button. All thermostats ... button released. Model Number: PYET344AYW Brand: Maytag Age: 5 - 10 years .... Check for 120vac on the purple wire at motor after releasing start button. If it goes ... GE Dryer will not stay running when start button released ...
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Jul 26, 2014
Starts but won't stay running
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Sep 12, 2013
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More results from forum.appliancepartspros.com

Ge dryers have a belt sensing switch inside that won't let the dryer run (just as you describe) when the belt breaks or comes off. My guess is you broke a belt. With door open---hold in button door switch and hit the start switch to get it too run a few seconds. Watch the drum and see if it turns. My guess it will not. Belt is a long skinny band that goes all around the drum outer area and then down around the motor.

you could have a bad motor. the motor has an internal switch that is stuck in the start position and not switching to run. replace the motor.

Check the belt is not broken . If the drum turns when you start it then either the belt switch is bad or the motor switch is not working because it is bad or the motor may be full of lint.

Hi,
There can be many reasons why your dryer will not turn...

This tip that I wrote will help you to figure out what is happening...

Dryer Repair - The Dryer is not Turning
http://www.fixya.com/support/r4422207-dryer_repair_dryer_not_turning

Dryer Repair ? The dryer will not start
http://www.fixya.com/support/r4460438-dryer_repair_dryer_will_not_start


heatman101

This dryer is under warranty. Call the store where you purchased it as they are obligated to fix it for free or take it back.

start switch is bad,it is stuck inside,get the model number inside dryer door or on top panel,call local appliance parts store to get new part,only a few bucs,replace and you should be allright,let me know-mike