Peter for Model Number DV50F9A6EVW/A2 I have an interesting situation. My Samsung dryer WILL ONLY HEAT when I put it in the Vent Blockage Test mode (turning On and pressing "Adjust Time Up" and "Dry Level" buttons simultaneously for 3 seconds). In any other mode (manual time, delicate, sanitize, high heat, low heat), there is NO HEAT. When I start the dryer in Vent Blockage Test mode, the dryer heats for 30 sec, then turns off heat (still tumbles & blows). I can hear a relay turning off the heat at 30 sec, no matter how hot the exhaust is. The 1st time I run it, it heats for 30 sec, then I can use the dryer Data Display Mode to see temperature =~31C, dropping slowly from there. If I immediately run it a 2nd time (while it's still warm), it heats for another 30 sec, and the dryer data display mode measures 39C & falling. It is clear there is a 30 sec timer that cuts off heat rather than a temperature cutoff. I have tested all the normal components as good. Thermostat 1 (a.k.a. thermistor) = 13.9k Ohms at 65F, TH2 Hi-Limit = 0.1 Ohms, TH3 Cutoff = 0.1 Ohms, and the heater = 9.7 Ohms. I don't think it's the Moisture sensor since no heat during Timed Dry. If the Centrifugal switch were the problem, I doubt the Vent Blockage Test would create heat. I am running the test venting straight out the back of the dryer with no exhaust piping, and there is no blockage of any sort. Dryer model is DV50F9A6EVW/A2. I'm close to giving up. Would this likely be a circuit board problem, or should I just replace the Thermostat 1 and TH2 even though they test good? If someone knows what the Vent Blockage Test mode is bypassing, I think this would be an easy diagnosis. (I have replaced the thermistor just in case, but it did not fix the problem.)
Answer Peter, Based on the unit working in the test but not in any other cycle then this will be a faulty main control board. Read More... Answered by AppliancePartsPros.com | Wednesday, January 8, 2020