Water supply error: the dishwasher is not getting water at the pressure or temperature it needs.
Homeowner part this code names: dishwasher water supply line.
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Same characters, different appliance: Samsung 4C on a washing machine is a different fault. Samsung washing machine 4C.
Likely causes
- Household water pressure outside Samsung's 20 to 120 psi range (below 20 psi can make the water supply valve fail and stop it shutting off properly)
- Hot water supply outside the 120 to 149°F (49 to 65°C) range Samsung specifies
- A problem with the supply line feeding the dishwasher (Samsung says supply line issues can cause error codes or blinking lights)
How to fix 4C: safe DIY steps
- Troubleshoot before you reset: Samsung warns that clearing the code without fixing the cause can make it return
- Check the hot water supply temperature: Samsung specifies 120 to 149°F (49 to 65°C) and says it should not exceed 149°F to avoid severe burns
- Check that your home's water pressure is between 20 and 120 psi
- Inspect the supply line and its connections. Samsung recommends a stainless steel supply line (sold separately, up to 10 ft) and a 90-degree elbow with 1/2-inch NPT on one end and a 3/8-inch compression fitting on the other
- On models without a digital display, a blinking Auto or Express 60 light can mean the same thing: water pressure or temperature is not correct
- If temperature and pressure are within range and the error still occurs, switch off power to the dishwasher at the circuit breaker and request Samsung service
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When to call a pro
If your water temperature and pressure meet Samsung's requirements and the error keeps returning, Samsung says to switch off the dishwasher at the breaker and request service.
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Parts & tools for this fix
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Dishwasher water supply line: guide
In this code: Household water pressure outside Samsung's 20 to 120 psi range (below 20 psi can make the water supply valve fail and stop it shutting off properly)
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