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Error code reference

Samsung Washer Error Code C4

Water supply temperature check

Samsung codesSamsung washer codes
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What the C4 error code actually means

The C4 error means your Samsung washer detected water that is too hot for the cycle it was running, or the hot and cold water hoses connected to the back of the machine may be switched around. This can happen if the hoses were connected incorrectly during installation, or if the washer's temperature sensor is reading abnormally high values. Checking that your water hoses are plugged into the correct inlets is the first and easiest fix to try.

Diagnostic procedure

The full C4 procedure

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1
First diagnostic step
Check that cold and warm water supply hoses are correctly connected.
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Most common causes of C4

Ranked by how often they cause this code
  1. 1Reversed hot and cold water supply hoses
  2. 2Water temperature exceeding 60 degrees Celsius during Wool or Lingerie cycle
  3. 3Water temperature exceeding 60 degrees Celsius during dry cycle via dry valve
  4. 4Faulty water temperature sensor (thermistor)
  5. 5Defective water inlet valve

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Questions people ask about C4

What does C4 mean on a Samsung washer?
The C4 code on a Samsung washer indicates a water supply temperature fault. It activates when the hot and cold inlet hoses are connected incorrectly, or when the water temperature sensor detects a reading above 60 degrees Celsius during a dry cycle or while running Wool or Lingerie programs. The machine stops operation to protect both the appliance and delicate fabrics from heat damage.
Is it safe to use my Samsung washer when the C4 code is showing?
You should not continue running the washer while C4 is active. The code exists to prevent damage to delicate fabrics and to protect the machine from operating with incorrect or excessively hot water temperatures. Running cycles repeatedly through a C4 fault could cause damage to clothing or internal components.
How much does it cost to repair a Samsung washer C4 error?
If the fix is simply reconnecting reversed water supply hoses, there is no parts cost at all. If a component like the thermistor or water inlet valve needs replacement, parts and labor costs typically range from around 100 dollars to 300 dollars or more depending on your location and whether a technician is required. Getting a diagnostic visit quote before authorizing repairs is a good practice.
How do I fix the C4 error on my Samsung washer?
Start by turning off the washer and inspecting the water supply hose connections at the back of the unit. Confirm that the cold water hose connects to the cold inlet and the warm or hot hose connects to the correct warm inlet. If the hoses are properly connected and the error returns, further diagnosis of the thermistor and water inlet valve is needed, which may require a technician.
Will resetting my Samsung washer clear the C4 error?
A reset may temporarily clear the C4 code, but if the underlying cause is not corrected, the error will return during the next affected cycle. Resetting without fixing the root problem, such as swapped hoses or a faulty inlet valve, will not resolve the fault. Address the cause first, then reset the machine.

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