9E1 Serious Moderate DIY

Samsung Washer 9E1 / 9E2 / Uc — Line voltage / power supply error

Samsung Washer · Error code 9E1

What 9E1 Means

Incoming voltage is outside the acceptable range (about 90-130 VAC for US units). The control halts to protect itself and the motor.

Symptoms

  • Random shutdowns mid-cycle
  • 9E1, 9E2, or Uc on display
  • Lights dimming in the house at the same time

Common Causes

1
Shared circuit overload

Washer plugged into a circuit with a high-draw appliance dropping voltage.

2
Bad outlet or extension cord

Loose/charred receptacle, or any extension cord (not allowed).

3
Utility brownout

Low line voltage from the utility, especially during summer peak.

4
Failed main control or noise filter

Internal AC sensing circuit reads wrong.

How to Fix It

  1. Plug the washer directly into a dedicated 120V wall outlet — no extension cord, no power strip.
  2. Measure the receptacle with a multimeter — should be 114-126 VAC under load.
  3. Try a different known-good outlet on a separate circuit.
  4. If 9E1 persists on confirmed-good power, replace the EMI noise filter at the inlet.
  5. If still failing, replace the main control board.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement Samsung washer EMI noise filter View on Amazon→

More Samsung Washer Codes

3C 3C / 3E — Motor Fault 4C 4C / 4E — Water Supply Error 4C2 4C2 — Hot water connected to cold inlet 4E 4E — Water supply error (older code, same as 4C) 5C 5C / 5E / SC — Will Not Drain 5E 5E — Drain error (older code, same as 5C)

All Samsung codes → All washer codes →

Verified against manufacturer documentation: samsung.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.