John S for Model Number SAMSUNG Dryer: DV5451AEW/XAA 03 The dryer runs fine in all positions but no heat. The digital display always shows with the "cooling" light on in every mode or position while it is running. So, in essence, it is in cooling mode when it never had generated any heat as of yet? I am wondering if there may be a certain part causing the issue or could it be numerous different parts? If it never generated heat but is always in "cooling" mode is this typically found to be a common solution versus replacing several different parts one at a time until it heats up again. i.e. - Thermistor, Thermostat, heating element.
Answer John, You will want to test the thermostat and the heating element to make sure that they have continuity. If there is no continuity then the part would need to be replaced. If the thermostats and heater check ok then. There are 2 components other than the thermostats which would cause the heating element not to work. First is the motor and second the Control board. The best option is to disconnect the power to the unit and access the heating element. Disconnect one wire that is going to the heating element, preferably the one on the thermostat side. Plug the unit back up and using a multimeter you will want to turn the dryer on and test for 120 vac at the terminal on the heater where the wire was disconnected. What this will do is eliminate the heater element itself and the motor. If there is 120 vac at this point then you know the heater is good and the motor is good because the other 120 vac coming through the thermostats is the control board side of the circuit. If there is not 120 vac at that point then you will want to test the other terminal on the heater and check for 120 vac. If there is not 120 vac then the motor would be bad . Read More... Answered by AppliancePartsPros.com | Tuesday, February 28, 2017