The C-20 error on your Samsung Washer means the machine has detected a drainage problem — water isn’t leaving the drum within the expected time. Most cases are caused by a clogged filter or kinked drain hose, and you can often clear it yourself in under 30 minutes.

Error code C-20
Meaning Drainage fault — the washer cannot pump water out of the tub fast enough
Severity Medium — the wash cycle will stop and water may remain in the drum
Time to fix 15–40 minutes
Tools needed Towels, shallow tray, pliers (for hose clamps)

What the C-20 error means

C-20 is Samsung’s drainage error code. It appears when the control board expects the tub to empty within a set time but the water level sensor still detects water after that window has passed. This usually points to something physically blocking the flow of water out of the machine, rather than an electrical fault, though a failed pump can also trigger it.

Common causes

  • Blocked or dirty drain filter (the small access panel at the front-bottom of the washer)
  • Kinked, crushed, or clogged drain hose behind or under the machine
  • Coins, hair ties, tissue, or small items trapped in the drain pump
  • Drain hose positioned too high or with an incorrect loop, restricting flow
  • Faulty drain pump motor that can’t push water out
  • A blocked household drain or standpipe the washer connects to

How to fix the C-20 error

  1. Turn off and unplug the washer: Always disconnect power before checking any drainage parts to avoid electric shock.
  2. Clean the drain filter: Open the small door at the bottom-front of the machine, place a shallow tray underneath, and slowly unscrew the filter cap. Remove any lint, coins, or debris, then rinse the filter under a tap before refitting it.
  3. Check the drain hose: Pull the washer out from the wall and inspect the hose for kinks, tight bends, or blockages. Straighten it out and make sure it isn’t pinched behind the unit.
  4. Inspect the drain pump: With power off, access the pump (often behind the filter panel) and check for trapped objects like buttons or fabric caught in the impeller. Clear anything you find by hand.
  5. Confirm the hose height and loop: Make sure the drain hose end sits no higher than the manufacturer’s recommended height (usually under 1 metre) and has the correct U-bend to prevent siphoning issues.
  6. Run a test cycle: Plug the washer back in and run a short rinse-and-spin cycle to see if C-20 clears. If it reappears, the drain pump motor may need professional testing or replacement.

FAQ

Can I still open the door after a C-20 error?
Not immediately if there’s standing water — most Samsung washers lock the door until the water level drops. You may need to manually drain the tub first using the emergency drain hose or filter access point.

Is C-20 the same as other Samsung drain-related errors?
No. C-20 specifically points to a drainage timeout, whereas other codes like Samsung Washer DE Error Code: Causes and Fixes relate to door issues, and codes such as Samsung Washer LE Error Code: Causes and Fixes point to leak detection.

Do I need a technician for this error?
Usually not. Most C-20 errors are cleared by cleaning the filter and hose. If you’ve checked those and the error persists, it likely means the drain pump motor has failed and needs professional replacement.