Basement flooded and got approx 12 inches of water in bottom of dryer let sit for a week to dry before trying when pushing start button will come on but wont continue running unless you hold button in then after approx 30 seconds it shuts down and nothing works for approx 15 minutes then will do the same thing again removed back cover and found no water inside

It's possible you have damaged the gas control valve or damaged the sensors in the heat chamber which are relatively easy to replace. They work on a safety system which will shut down all operations if they aren't performing properly, especially the gas regulator valve.

water killed motor

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The motor is ruined...
There can be many reasons why your dryer will not start or turn...

The most common causes are the belt breaking or jumping off, or the motor going bad...

Here are a couple of tips that I wrote will help you to figure out why your dryer will not run...

Dryer Repair - The Dryer is not Turning

Dryer Repair - The dryer will not start


heatman101

the motor is cooked,i live in the boston area and we had some bad floods a few months ago,all i did for two weeks was change out dryer motors,you can try to spin the drum and hold in the door switch and have someone else hold in the start button to see if it will start but you have to change out the dryer or get a new one if it's in rough shape

motor

Sorry to say but water ruined the motor. You can test it again by pushing the start button and at the same time spin the motor. If the motor starts that will tell you the start windings in the motor are bad. The motor would have to be replaced.

Did you look in the breaker box?
3 inches should have shorted the plug receptacle.
Just reset the beaker

if it was p[lugged in you might have to replace the circuit board,, they can conduit electricity from one circuit to the other in water

First, there is an excellent chance you have some kind of flood damage insurance.  It may pay for part of the repair.  You did not tell us what is not working but I'll guess it is the motor.  On many models, there is a switch on the motor which will not allow the elements to heat unless the motor is powered and running.

the motor on most dryers sits approx 1 inch off of floor on bottom base plate.if you had more water than that,you have a open motor winding.aprox price for repair if u call a tech is $300.washers stand a better chance of surviving a flood,dryers very rarely do.