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Samsung Washing Machine Error Code UC: Voltage error

Applies to Samsung washing machines that show UC or PF, 9C1, 9C2 on the display.

Quick answer

There is an irregularity in the electrical current supplied to the washer. A PF code after a power cut, an unplugged washer or a tripped breaker is expected behaviour, not a fault.

What this code means

The washer monitors its supply voltage. Spikes, brownouts, and running the machine in a country with a different grid standard can all trigger this code.

The manufacturer's checks, in order

  1. Confirm the washer is on its own circuit and is not using an extension cord.
  2. If the power went out, the washer was unplugged, or a breaker tripped, simply restart the cycle — that is the PF variant of this code.
Where you stop

If the code continues on a clean, dedicated circuit, Samsung says to request service.

Related Samsung washing machine codes

LE — Water level / leakage error4E — Not filling error5C — No drain errordE — Door errorUE — Unbalanced load error4C2 — Hot/cold error

Source & provenance. The meaning, the checks and their order, and the service line on this page are restated from Samsung official support — “Samsung Washing Machine Information and Error Codes” (source), read on 2026-11-06. No forum content, no invented repair steps, and nothing involving gas, refrigerant or mains wiring. Where the manufacturer says to request service, this page stops too.