Samsung Dishwasher Error Code High temperature water supply error

This error means the dishwasher detected that the water entering the machine is above 176°F (80°C), which exceeds the safe operating limit. The dishwasher monitors incoming water temperature to protect its components and ensure proper wash cycle control. This fault is almost always caused by an external hot water supply issue rather than a problem inside the dishwasher itself. Addressing the water source is the correct first step.

You should not attempt to run a wash cycle while this error is active. Water above 176°F can damage plastic internal components, gaskets, and spray arms inside the dishwasher. The machine displays this error as a protective measure, and operating it under these conditions risks permanent damage. Resolve the water supply temperature issue first before resuming normal use.

If the fix involves simply adjusting your water heater thermostat, there is no parts cost involved. If a water heater thermostat replacement is needed, parts and labor typically range from $150 to $400 depending on the water heater type and local labor rates. In the rare case that the dishwasher's water inlet valve needs replacement, that repair generally falls in the $80 to $200 range including parts and labor.

Start by checking your home water heater and lowering the thermostat to between 120°F and 140°F if it is set higher. After adjusting the water heater, allow time for the supply water to cool, then run cold water at a nearby faucet briefly to flush the hot water line before restarting the dishwasher. If the error continues, verify the dishwasher is connected to the correct residential hot water supply line and not a recirculating loop operating at excessive temperatures.

A reset may temporarily clear the error code, but the fault will return as soon as the dishwasher detects high-temperature water again at the start of the next cycle. The underlying cause, which is the incoming water temperature being too high, must be corrected before the error will stay cleared. Fix the hot water supply issue first, then reset the dishwasher.