Samsung Washer Error Code 4C2

The 4C2 error code on a Samsung washer indicates a water supply temperature fault. The machine's water temperature sensor has detected an abnormal incoming water temperature during operation. Specifically, this code triggers under three conditions: the cold and warm water supply hoses are reversed at the inlet connections, the water temperature exceeds 70°C during a dry cycle valve operation, or the water temperature exceeds 50°C during a Wool or Lingerie wash course. The code is tied to the inlet water temperature sensing system, which monitors incoming water to ensure the correct thermal conditions are present for each wash program.

The most common cause is a simple plumbing error where the hot and cold water supply hoses have been connected to the wrong inlet valves on the back of the machine. When the washer opens what it expects to be the cold water valve, it instead receives hot water, causing the temperature reading to spike far beyond the expected threshold. This is especially likely after installation, a recent move, or any plumbing work behind the machine.

In cases where the hose connections are correct, the fault may indicate that the actual incoming hot water supply is running at an unusually high temperature, pushing readings past the 70°C or 50°C thresholds defined for the specific cycle in progress. Less commonly, a faulty water temperature sensor or a malfunctioning inlet valve that fails to regulate flow properly could cause erroneous temperature readings and trigger the error. Checking hose connections is always the first and most important diagnostic step before investigating sensor or valve components.