Brand:Samsung Model Number:dv400ewhdwr/aa Main Symptom:dryer does not stop What happens & when:
My dryer developed the problem that it does not stop. It heats fine, dries the clothes fine, but when the cycle is over or the power button is pressed to turn it off, the dryer does not stop. When the door is opened it does stop, but when the door is closed it restarts.
I thought I can live with that, but now things are worse: sometimes I just can’t change the settings. And it seems random whether turning the knob or pressing the buttons will have any effect or not.
Based on what you’re describing with your Samsung DV400EWHDWR/AA dryer, I suspect you may have a stuck motor relay on the main control board, along with a possible issue in the user interface controls.
The biggest clue is that the dryer keeps running even after the cycle finishes or you press Power to turn it off. Opening the door stops the motor, but closing it causes the dryer to start right back up.
Here’s how I would narrow it down before ordering parts.
1. Check for a stuck motor relay
This is my first suspect. The main control board has a relay that supplies power to the dryer motor. If that relay sticks closed, the motor can continue running even when the control is telling it to stop.
Try this simple test:
Start the dryer and let it run for a minute.
Press the Power button to turn it off.
If the drum continues turning, open the door.
With the door open, press Power again to make sure the display is off.
Close the door without pressing Start.
If the drum immediately starts turning again with the display off, that’s a strong indication that the motor relay on the main control board is stuck.
2. Check the control panel
The second concern is that you’re now having trouble changing settings with the cycle selector and buttons.
That could indicate a problem with the user interface board, its wiring connection, or the main control board not responding properly.
Try unplugging the dryer for about five minutes. Restore power and see whether the buttons and selector respond normally before starting a cycle.
If the controls remain unresponsive or work intermittently, inspect the connections between the user interface and main control board.
3. Which part would I suspect?
For your model, the main control board DC92-01025A is a likely replacement candidate, although the correct revision should be verified using the complete model number and version.
There are also documented cases involving this model where a faulty motor relay caused the dryer to continue running.
Appliance Parts Pros
+1
Because the controls are also acting up, I wouldn’t replace the user interface board just yet. The main board could be responsible for both symptoms.
One important safety note: Until this is repaired, unplug the dryer or turn off its breaker when you’re not using it. Don’t rely on opening the door as the only way to stop it.
One question before you order anything
When you press Power and the display goes completely dark, does the drum continue spinning with no heat, or does it continue heating as well?
That will help us determine whether the motor relay is stuck or whether the control board is failing in another way.
I tried to check what you asked… and the dryer was fully functional again. Not sure if I should be happy or sad :-). I’ll do the tests if it starts to act up again. Anyway, thanks for the tips!
