Where do I get a part that allows my dryer to operate without an exhaust vent? My dryer is DPSR610EGWT .

My GUESS is the machine was either operated without the lint screen and an item made its way near the exhaust fan or piece of the lint screen itself has broken loose and made its way near the fan. The sand noise would likely be debris being swept up by what ever got into the fan duct, then through the fan leaving the item stuck near the fan. I suppose it would be possible for lint to build up in the internal duct and it dislodged... but not likely unless poor exhaust or extreme exhaust vent length. But I would expect other complaints if that were the case.

It could be a bad cycling thermostat allowing the dryer to get too hot, or the dryer vent could be stopped up causing the exhaust to back up in the unit making it get hotter quicker. If you have any further questions feel free to ask here:
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The CHECK VENT duct blockage sensing system detects and alerts you to blockages in the duct work that reduce exhaust flow from the dryer. This light does not indicate any problems with your dryer. If this light blinks, it indicates that your home's exhaust system/duct work has a serious restriction

Every time the dryer is turned on, the CHECK FILTER LIGHT WILL BLINK, as a reminder to make sure the filter is clean. Always make sure the lint filter is clean before starting a new load; a clogged lint filter will increase drying times.

The Kenmore Elite dryer has a sensor that detects poor exhaust venting, and when it does, a light flashes on the control panel. This warning light does not include a mechanism to stop gas flow, but if it is allowed to flash for an extended period, poor venting may cause the dryer to overheat. As a result, a fuse might blow and disable the gas valve or ignitor. You can prevent this by diagnosing the reason for the flashing indicator light as soon as possible.

In many cases, LINT has built up somewhere in the exhaust pipes.

Check under the lint filter. Pull it out,look inside the slot it fits in, and clear all lint from this area.

Is it possible you have used the WRONG VENT MATERIAL?
Check your vent to make sure it is 4 inch rigid or semi-rigid metal ducting. If your venting is plastic or flexible foil, replace it before using the dryer.

Check your vent hood outside. You may have a restricted or damaged vent hood. It must be clean and free of lint buildup. Check the damper and make sure it opens fully and easily and is free of lint.

I know you said you have no elbows, but I have posted the pipe run lengths with and without elbows. Keep in mind this is with 4 inch rigid or semi rigid metal ducting.

Measure the length of your exhaust system and count the elbows. Use the chart below to see if your duct is too long. If it is too long, have the duct routed to another location that is within the venting guidelines.

0~90 degree elbows=65 ft of 4 inch rigid metal duct.
1~90 degree elbow=55 ft of 4 inch rigid metal duct.
2~90 degree elbows=47 ft """"""""
3~90 degree elbows=36 ft """"""""
4~90 degree elbows=28 ft """"""""

You should always use duct tape or metal tape on all joints, NEVER USE SCREWS, as screws capture lint inside the pipe.

One more note. Lots of people overlook the fact that fabric softeners can build up on the lint filter over time. This buildup can restrict the airflow through the filter reducing dryer efficiency and lengthening drying times. After removing lint, if the filter looks dark or dirty when held up to the light, follow these steps to clean:

Use hot soapy water and a stiff brush to clean
the filter.
Make sure the filter is completely dry before
reinstalling it and using the dryer.
NEVER operate the dryer with a wet lint filter.

Check your exhaust vent in the wall. It may be plugged with lint debris causing long drying times. Best way to test it is to disconnect the vent from the wall and run a normal load to see if the dryer runs normally. If so, you will need to have a professional clean out your exhaust vent for proper operation.
Good luck

The main cause is a plugged exhaust vent in the wall. Try disconnecting the exhaust vent from the wall and run a normal load. If the load dries properly, then you will need to have the exhaust vent professionally cleaned.
Good luck

Check that the gas sensor is clear or any lint/dust/crud, etc. as that could be preventing the gas valve from opening up and allowing ignition. Typically all gas dryers have a safety feature that won't allow operation if the exhaust vent pipe has excessive lint and dust in it, as that is a fire hazard.

Look in your owner's manual to see the procedures for accessing the vent exhaust and follow your specific instructions. Usally there is an access panel/door at the bottom front of the dryer that will allow you to get inside the vent, etc. Inside that is a surface mounted sensor that does a couple of things; checks for proper air (venting) flow; no excessive dust/lint buildup; and that the ignitor coil has been "lit", etc.

If any of these doesn't occur, the gas valve will not open. Follow the monthly cleaning procedure/check to make certain that the dryer is safe to use and operate.

If all the above are OK, then it is likely that the sensor has failed and needs to be replaced. You can look at the searspartsdirect.com to find your particular model using their parts diagrams and illustrations of your dryer, etc.

Glad to assist!

open dryer, turn it on and make shure the elements get hot. right beside or in front of it, there is a quarter sise thing with two screws. that is the thermistor. you can get it check for free most any ware. yes most likely it is the thermistor.

A1 Pull the dryer out away from the wall. Unhook the vent from the dryer completely. Do not put anything over the dryer exhaust on the back of the dryer. Do a normal load with the vent unhooked. If it dries better or ok like this then the problem is in the dryer venting. Like a blocked vent pipe or a smashed or restricted vent hose.
A2 - If the vent  doesn't make a difference, then check the blower wheel for excessive lint build up, check that there isn't anything stuck to the air intake baffle inside the drum, (i.e. the screen on the back wall of the dryer when looking into the drum). Check the lint filter chute for blockage. Check that the heating element isn't shorted to ground. Check the exhaust temperature of the dryer. A meat or pocket  thermometer can be used for this. It should cycle between 120 degrees and 170 degrees. Check that the drum seals to make sure the are not worn out.

open it up follow the vent,it is either blocked or came off.