Samsung · Dishwasher Serious

9C1 — / UC / 9E1 — Abnormal voltage

The main control detected line voltage outside its safe operating range and entered protection mode to avoid damage.

Keep using it?
Limited use only
DIY difficulty
Moderate
Verified against
samsung.com ↗

How to fix it

  1. Power off at the breaker for 5 minutes and restart — clears transient faults.
  2. Measure outlet voltage with a multimeter under load — should be 114–126V (US).
  3. Move any other heavy appliances off the dishwasher circuit and retry.
  4. Have an electrician check the outlet and breaker for loose connections if voltage is unstable.
  5. If voltage is solid and code persists, replace the main control board.

Why it happens

Typical signs: 9C1, UC, or 9E1 on display · Cycle aborts mid-way · Will not start · Other appliances on same circuit also misbehaving

  • Low or high household voltage Brownout, overloaded circuit, or shared circuit with a high-draw appliance.
  • Loose neutral or hot at outlet Backstabbed receptacle or loose breaker connection.
  • Failed control board power supply Internal regulator misreading line voltage.
  • Generator or inverter power Some non-pure-sine inverters trigger this.

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.

  • Samsung dishwasher main control board Common replacement
    Amazon →

More Samsung dishwasher codes

1C 1C — Low water level / fails to start 1E 1E / IE — Filter clogged / heater fault 3C 3C Error — Wash Pump Failure 3E 3E — Hot water supply too hot 4C 4C / 4E — Water Supply Error 4C5 4C5 / 4E5 — Fill timeout with dry tub

All Samsung codes → All dishwasher codes →

Frequently asked questions

What does the 9C1 code mean on a Samsung dishwasher?

The main control detected line voltage outside its safe operating range and entered protection mode to avoid damage.

What causes the 9C1 code on a Samsung dishwasher?

Low or high household voltage: Brownout, overloaded circuit, or shared circuit with a high-draw appliance. Loose neutral or hot at outlet: Backstabbed receptacle or loose breaker connection. Failed control board power supply: Internal regulator misreading line voltage.

Is it safe to keep using a Samsung dishwasher with a 9C1 error?

Limited use only. This is rated a serious-severity fault.

How do I fix 9C1 on a Samsung dishwasher?

Power off at the breaker for 5 minutes and restart — clears transient faults. Measure outlet voltage with a multimeter under load — should be 114–126V (US). Move any other heavy appliances off the dishwasher circuit and retry.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: samsung.com.