Hello Josh,
We are here to assist you with your inquiry. Let's get you the details you need.
If your Samsung dryer is stuck on the cooling setting, ensure you haven't accidentally selected a "Wrinkle Prevent." If not, the most common cause is an airflow issue; clean the lint filter and then thoroughly clean the dryer's vent hose and the entire vent system to prevent overheating, which triggers the cooling mode lock. For reference, click the link and hyperlinks and watch the embedded video for tips.
How to clean your Samsung dryer:
https://www.samsung.com/us/support/answer/ANS10001019/
For additional information, turn to page 45 of the dryer under "Does not heat (See bullets 2, 4, and 5):
https://downloadcenter.samsung.com/content/UM/202509/20250923094240114/DC68-03784D-14_IB_DV5400_EN_250919.pdf
Should you ever need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Please provide us with the reference number, 1150903259, to help our team locate your information when you message us.
Have a great day.
-John