What does error code f23 flashing mean on a Whirlpool Duet Dryer model wed9400sz0?

I'm sorry to hear that you are having some difficulties with your dryer. I did some research for you at Managemylife.com and found an expert answer to a similar question that may help until your expert can respond to your specific question. The link is attached below. If you do decide to schedule service and have a qualified technician help you, I have also attached a link to Searshomeservices.com. I hope these links provided assist you.

Thanks that link was helpful but kinda iffy on the whole diy issue unless it truly is capable of being done without a pros help mine is a (front loader) different diagram from the one on the link..Than you though...

F23 is an exhaust thermistor shorted error.

Replacing the thermistor is the most likely fix for this problem. You can access this component by unplugging the dryer and removing the bottom front service panel as shown in the image below. For further assistance, respond with more detail.