Dryer Won't Turn On. If your dryer won't start there's a number of different things that could be. Samsung dryer stuck in cool down mode; PRESENT YOUR REQUEST May 18, 2017. Samsung dryer stuck in cool down mode. Published by at December 8, 2020.
Check the Drying mode/Moisture sensorSamsung Dryer Will Not Start
Dryer Not Working Well
Samsung Dryer Stays In Cool Down Mode
If your dryer does NOT start right back up, then it might be the motor overheating.If your dryer starts right back up, then it's not likely an overheating issue as the relay would not allow the motor to start back up.
This could be a few issues:
1) Some dryers have a mode based on dryness like 'less dry' or 'more dry' and uses mist/moisture sensor to determine when to shut off. When you start the dryer, it may state the default time like 50 min. But if it is a smaller load, it may shut off in 10, 20 min or less than the noted time on the display.
To test this, try a TIME DRY mode and set it to the exact time you need and time it on another device like your phone. If the time aligns, then you're probably good and maybe it was set to dryness mode before.
On a DRYNESS mode, set it and sync with another timer to the time the dryer states on the display (example: 50 minutes). When the dryer shuts off, compare the times and check the clothes. If the clothes are dry, it is likely that your dryer is just running in DRYNESS mode and sensing your clothes are dry.
note: I have a Frigadaire Affinity and the button for the mode has less dry, normal, more dry options. If you set it to normal, it should run the full 50 minutes. On the other options, it will stop when the clothes are dry.
2) A bad mother board - this could be a $200+ repair/replacement. Bad boards create all types of strange issues.