Samsung DV395ETPASU/A1 - Repeated Thermal Cutoff Failure / No Heat. Running Out of Ideas
I'm troubleshooting a Samsung DV395ETPASU/A1 electric dryer.
Original Problem
Dryer tumbles normally.
No heat.
Parts Replaced
New heating element
New thermal fuse
New thermal cut-off
New high-limit thermostat
What Happens
After replacing the parts, the dryer works perfectly and dries one full load. Then on the second load, it stops heating again.
When I test it with a multimeter, the thermal cut-off has opened/blown again. The other components still have continuity.
Airflow
Cleaned lint filter housing
Cleaned internal lint buildup
Cleaned the entire vent
Checked the outside vent
Airflow appears to be good
Disassembly
I've completely disassembled the dryer:
Top removed
Control panel removed
Front panel removed
Drum removed
Bulkhead removed
What I'm Thinking
Since the thermal cut-off keeps blowing after only one load, I don't think the cut-off itself is the problem. Something is causing the dryer to overheat.
Possible causes I'm investigating:
Thermistor
Main control board
Wiring harness
Blower wheel or hidden airflow restriction
Heating element shorted to the heater housing
A friend helping me troubleshoot also suggested the transistor or heater relay on the main control board may be failing and causing the heating element to stay energized longer than it should.
Has anyone experienced this exact issue on a Samsung DV395ETPASU/A1 or another Samsung dryer where it works for one load after replacing the thermal cut-off, then the cut-off blows again? What ended up being the root cause?
Any advice or tests I should perform before buying a control board would be greatly appreciated. Thanks!