What to check, in order
- Open the supply valve
The valve that feeds the dishwasher may be closed or only part open. Check the water supply to the house hasn't been cut off too.
- Check the supply hose
It shouldn't be kinked, bent or folded. If it's frozen, Samsung UK says to thaw it in warm water.
- Thaw a frozen valve
Samsung UK's method: soak a towel in water at 50 to 60°C, wrap it round the valve, and repeat until it thaws. Take care not to scald yourself.
- Clean the valve filter
With the water turned off, clear any debris from the small filter on the inlet valve.
- Check the pressure and temperature
Samsung US asks for a supply of 20 to 120 psi (about 1.4 to 8.3 bar), with water at 120 to 149°F (49 to 65°C) and no hotter.
When to call an engineer
If the supply is on, the hose is clear and the code comes back, the water inlet valve has probably failed. Less often it's the control board. Samsung UK says to call its service centre for either.
Good to know
- Samsung US recommends a stainless steel supply line, and turning the supply valve off if the dishwasher won't be used for a week or longer.
Parts people end up buying
Only if the checks above point to a part. Match it to your model number first: it's on a label on the edge of the door or the side of the tub.
- Water inlet valveSearch on Amazon
- Stainless steel supply lineSearch on Amazon
Affiliate links: as an Amazon Associate I earn from qualifying purchases, at no extra cost to you. It never changes a verdict.
Quick answers
What does the Samsung 4C error code mean?
Little or no water is coming into the dishwasher, so it stops with a dry tub. For 4C5 and 4E5, Samsung UK's first check is the water pressure.
Can I fix Samsung 4C myself?
Easy (about 20 minutes). Start with: open the supply valve; check the supply hose; thaw a frozen valve. If the supply is on, the hose is clear and the code comes back, the water inlet valve has probably failed. Less often it's the control board. Samsung UK says to call its service centre for either.
Is Samsung 4C worth repairing?
Worth fixing. The checks cost nothing and usually find it. If they don't, an inlet valve is an inexpensive part.
Checked against
- Samsung UK: 5C/5E, 4C/4E and LC/LE on a dishwasher
- Samsung UK: what the error codes on your dishwasher mean
- Samsung US: dishwasher water supply requirements
Last reviewed October 2026. Manufacturers update their pages, and your manual is the final word. Spotted a mistake? Email contact@appliance-error-codes.com.