What this code means
PF stands for power failure or power interruption. Your Kenmore microwave displays this code when electrical power to the appliance has been briefly lost or interrupted. The control board reboots and flags the event rather than indicating an internal component fault. Common triggers include a utility outage, a tripped circuit breaker, a loose plug, a weak wall outlet, or a momentary voltage drop on an overloaded circuit.
In most cases the code is informational and clears when you press the Clear, Stop, or Off button on the control panel. If PF reappears without any external power loss, the microwave’s power-input path or control board may have an intermittent fault that mimics a power interruption.
Before You Replace Anything
Homeowners sometimes replace the control board first when PF keeps returning, but a loose outlet receptacle or a worn power cord is usually the real culprit. Test the wall outlet with a known-good load and inspect the plug and cord for damage before ordering board parts.
Common Causes
- Utility power outage or momentary voltage drop A brief interruption from the grid or an overloaded circuit causes the control board to reboot and display PF.
- Tripped circuit breaker or blown fuse A breaker trips or a fuse blows, cutting power long enough for the microwave to reset and log the interruption.
- Loose plug or weak wall outlet A plug that wobbles in the receptacle or worn outlet contacts create intermittent contact that the control reads as a power failure.
- GFCI or AFCI device trip A ground-fault or arc-fault interrupter upstream trips and cuts power briefly before resetting automatically or manually.
- Failing control board or user-interface panel An internal fault on the control board causes random reboots that mimic external power loss and display PF even when mains power is stable.
Step-by-Step Fix
- Press Clear, Stop, or Off on the control panel to dismiss the PF code and return the microwave to standby mode.
- Check your home’s breaker panel for a tripped breaker or blown fuse on the circuit feeding the microwave and reset or replace it if needed.
- Unplug the microwave and inspect the power cord for cuts, fraying, or burn marks at the plug and where it enters the cabinet.
- Test the wall outlet with a known-good appliance or a multimeter to confirm stable 120 V AC power and that the receptacle grips the plug firmly.
- Eliminate extension cords and power strips by plugging the microwave directly into a dedicated wall outlet rated for the appliance’s amperage.
- Plug the microwave back in and run a heating cycle to verify normal operation and confirm the PF code does not return.
- If PF reappears without any external power loss, consult a qualified technician to test the control board and user-interface panel for intermittent faults that mimic a power interruption.
Parts Often Needed
| Part | Notes |
|---|---|
| Kenmore microwave power cord | Amazon | Replace if the cord jacket is damaged or the plug prongs are loose or burned. |
| Wall outlet receptacle (15 A or 20 A, 120 V) | Amazon | Upgrade a loose or worn receptacle to make sure firm plug contact and stable power delivery. |
| Kenmore microwave control board / user-interface panel | Amazon | Order the board assembly matched to your model number if internal testing confirms a fault and external power is stable. |
When to Call a Pro
Call a professional if the PF code returns repeatedly after you have confirmed stable power at the outlet and reset the breaker, if you are uncomfortable working inside the microwave cabinet to test the control board, or if you lack a multimeter to measure voltage and continuity. A technician will verify the integrity of the power-input circuit, test the control and user-interface boards for intermittent reboots, and replace faulty components with OEM parts matched to your Kenmore model number.