Samsung’s dryer support article groups HC, hE, HC4 and the combo spelling 1 HC as heating errors with a plain meaning: the dryer is getting too hot. The instruction that follows is to clean the lint screen and the vent, and on electric models to have an electrician check the voltage if the code persists. Notice what is missing from that list: no element, no thermostat, no board. Samsung puts airflow first because a dryer overheats when the heat it makes cannot leave, and a restricted exhaust is by far the commonest reason.
Stop Using It Until the Vent Is Checked
A heating code is one of the few dryer messages that should change your behavior immediately. Do not run another load to see if it happens again. A dryer that has already tripped a heating code on a blocked vent is a dryer with hot lint packed into its duct, and every further cycle adds heat to it. Clear the airflow first; then run the dryer.
Screen, Housing, Duct, Hood
With the dryer switched off and its drum cool, take the lint screen out and clean it, then clear the housing beneath it with a vacuum crevice tool, since lint that falls past the screen builds a mat at the bottom of the slot. With the dryer unplugged, or its breaker off if it is hard-wired, and with the gas valve closed on a gas model, move the dryer out and disconnect the transition duct at the wall. Check the duct behind the dryer for crushing, check its full length for lint, and go outside to the hood: the flap should swing freely and the opening should be clear of lint, leaves or a bird nest. If your dryer offers the vent blockage test, run it with the drum empty once everything is reconnected; a Clg, C80 or C90 result means the duct is still restricted and the heating code will return.
The Voltage Point on Electric Models
Samsung’s note about voltage is specific to electric dryers, which run their heating element on a 240-volt circuit. A supply that is high or has a poor connection at the outlet or the terminal block can make the element run hotter than the control expects. That check involves the receptacle, the cord and its terminal block under the rear cover, all live at 240 volts, and it belongs to an electrician or a technician, not an owner with a screwdriver.
HC2 on a Gas Dryer
Samsung lists HC2 separately, as a gas ignition error, with the instruction to power the dryer off for two or three minutes, power it on and restart the cycle, and to check the manual if it persists. If you ever smell gas near the dryer, at that moment or any other, do not touch the dryer’s controls, do not switch any light or appliance on or off, open a door or window if one is right beside you, get everyone outdoors and phone the gas utility from there. The igniter, flame sensor and gas valve on a Samsung gas dryer are diagnosed with the gas supply shut and confirmed shut, and only by a technician.
What Fails When Airflow Is Ignored
A dryer that keeps running with a restricted vent eventually opens its thermal fuse, a one-time safety device on the heater housing or the blower housing that does not reset. The dryer then tumbles without heat, or does not start at all, and the fuse has to be replaced along with the cause. On a dryer that has overheated several times, the high-limit thermostat, the thermistor that measures outlet air, and the element or burner assembly itself can all be affected. Replacing any of them without clearing the vent means replacing them again.
When to Book
If the screen is clean, the duct is clear, the hood opens freely and HC still appears within a few minutes of starting a heated cycle, the problem is inside the cabinet: a thermistor reading wrong, a thermostat that has drifted, a blower wheel that has come loose from the motor shaft so that air is not moving even though the motor runs, or a control relay stuck closed. Those are tested with the dryer open and the power isolated. Book a Samsung dryer repair, say which code you saw, and tell us whether the vent has been cleaned and when.