HC Serious Moderate DIY
Samsung Dishwasher HC — Heater overheating
Samsung Dishwasher · Error code HC
What HC Means
The heater circuit detected an over-temperature condition — either water boiled, sensor failed, or heater stuck on. Safety shutdown.
Symptoms
- HC on display
- Cycle aborts during heated wash or dry
- Steam from tub
- Heating element discolored
Common Causes
1
Heater stuck on (relay welded)
Main board relay shorted closed — heater runs continuously.
2
Failed temperature sensor
Thermistor reads low so control keeps heater on.
3
Low water in tub during heat
Underfill or mid-cycle leak left heater exposed.
4
Failed heating element
Element shorted to ground or to chassis.
How to Fix It
- Power off at the breaker for 5 minutes — do not run another cycle until inspected.
- Look at the heating element through the tub — discolored or burned areas mean replace it.
- Verify normal fill (no 9E history); a stuck-on heater with low water can melt the tub.
- Test the thermistor resistance per service manual at room temp.
- If the heater relay is welded (heater stays hot with power applied but cycle off), replace the main control board.
- Replace the heating element if shorted or burned.
Parts You May Need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
More Samsung Dishwasher Codes
Verified against manufacturer documentation: samsung.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.