mypros+
Error code reference

LG Range Error Code PF

Power Failure indication

LG codesLG range codes

Power Failure indication — the product has just been plugged in or experienced a power interruption.

First step from the service manual

Press the CLEAR/OFF key on the oven controls to clear the message; if display shows a flashing clock instead, press the Clock key and reset the time or press any key to stop flashing.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for PF.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What PF means on a LG range

The PF code on an LG range stands for Power Failure. It is not an error in the traditional sense, but rather an informational indicator that the appliance control board has detected an interruption in its power supply. This occurs any time the range loses and then regains electrical power, including when the unit is first plugged in, when a circuit breaker trips and resets, or when a brief utility outage occurs. The control board monitors its own power input continuously, and when voltage drops below the threshold needed to sustain operation, the board logs the event and displays PF upon restoration.

The component involved is the electronic control board and its associated clock or timer circuit. When power is restored, the board initializes and displays PF to alert the user that the previously programmed clock time and any active cooking functions have been lost. A flashing clock display may appear in place of or following the PF message, which simply indicates the clock is waiting to be set.

Clearing the PF code requires no disassembly or parts replacement in almost all cases. Pressing the CLEAR/OFF key will dismiss the message. If the clock display is flashing, the user should press the Clock key and re-enter the current time, or press any key to stop the flashing without setting the time. If PF appears repeatedly without any known power interruption, the issue may involve unstable household voltage, a loose power connection, or a failing control board.

Source: manufacturer service documentation.

Common causes of PF

  1. 01

    Utility power outage or momentary voltage dip

    Wiring / connection

    Even a very brief interruption in household power is enough to trigger the PF indicator when power returns. This is the most common cause and requires no repair.

  2. 02

    Tripped or reset circuit breaker

    Wiring / connection

    If the breaker serving the range trips and then is reset manually or automatically, the control board will display PF on the next power-up. Check the breaker panel if the cause of the trip is unknown.

  3. 03

    Range was unplugged or first installed

    Wiring / connection

    Plugging in a range for the first time, or reconnecting it after being moved or serviced, will always produce a PF display since the board has no stored power state.

  4. 04

    Loose or intermittent power connection

    Wiring / connection

    A loose connection at the wall outlet, terminal block, or power cord can cause repeated PF codes without a clear external power event. Inspect the outlet and cord connections if the code recurs frequently.

  5. 05

    Failing electronic control board

    Part replacement

    If PF appears repeatedly and no power interruption can be identified, the control board may be losing its internal power regulation. This is uncommon but would require control board replacement to resolve.

See the test procedure for each cause

Frequently asked questions about PF

What does PF mean on a LG range?
PF stands for Power Failure on an LG range. It is an informational indicator that the control board detected a loss of power and has since been restored. It appears after outages, breaker trips, or when the range is first plugged in. It does not indicate a component failure in most cases.
How do I clear the PF code on my LG range?
Press the CLEAR/OFF key on the oven control panel to dismiss the PF message. If the clock display is flashing after clearing, press the Clock key and enter the current time, or press any key to stop the flashing without setting the time. No tools or disassembly are required.
Is the PF code on my LG range a safety concern?
The PF code itself is not a safety hazard. It simply means the range lost power temporarily and is now operational again. However, if the power loss was caused by a tripped breaker or a wiring issue, you should investigate the root cause of that electrical problem before continuing to use the appliance.
Will resetting the range clear the PF code permanently?
Yes, pressing CLEAR/OFF will clear the PF code immediately. The code will not return unless another power interruption occurs. If PF keeps coming back without any obvious outage, check for a loose power cord, a faulty outlet, or a control board issue.
How much does it cost to fix a PF code on an LG range?
In the vast majority of cases, the PF code costs nothing to fix since it clears with a button press after a normal power interruption. If the code is caused by a failing control board, replacement board costs typically range from $150 to $350 for parts, with additional labor costs if a technician is needed.

Related LG range codes

All LG range codes
View all 39 LG range codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass