Thermador Microwave PF Error: Power Failure
Thermador microwave PF error indicates power failure. This is usually a simple issue you can resolve at home with basic troubleshooting. What Does Thermador Microwave PF Indicator Mean? The PF indicator on a Thermador Professional or Masterpiece built-in microwave or speed oven stands for Power Failure. It appears whenever the appliance loses and regains electrical […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Yes. PF is informational only. The microwave is fully functional after dismissing the notification. Dismiss PF, reset the clock, and use the appliance normally.
Can I reset the code?
Yes. PF clears immediately when you press Cancel or Clear. No breaker action is needed. The microwave is ready for normal use as soon as PF is dismissed.
When to stop immediately?
Stop if you notice: PF appears multiple times per day without an obvious power source, Circuit breaker trips repeatedly when the microwave is running.
Symptoms You May Notice
PF appears on the display after a power outage or circuit trip
The microwave display shows PF (Power Failure) when power is restored after an outage, a tripped circuit breaker, or a brief brownout in the home electrical supply.
Clock on the microwave reads 0:00 or is flashing
Along with PF, the time display has reset to zero or is blinking because the time-keeping memory was cleared during the power interruption.
Any food that was being cooked is not heated when power returns
If a cooking program was running when power failed, that program was cancelled and the food is not cooked. There is no auto-resume after power restoration on Thermador MBES and MCES microwaves.
Possible Causes
Utility power outage or brownout
A grid-level power event caused the household electrical supply to drop, interrupting power to the microwave circuit.
DIY PossibleTripped circuit breaker
The dedicated or shared circuit breaker serving the microwave tripped due to overload, a ground fault, or a surge event.
DIY PossibleDeliberate disconnection for reset or service
The microwave was disconnected at the breaker for servicing or resetting another fault, and PF appeared when power was restored.
DIY PossibleSafe Checks You Can Do
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1
Dismiss PF and reset the clock
Press the Cancel or Clear button (or the Stop/Reset button on Thermador speed oven models) to dismiss the PF notification. Then follow your model's clock-setting procedure to restore the correct time. On Thermador MCES speed ovens, hold the Clock button and use the dial to set the hour and minute.
PF on a Thermador built-in microwave requires no repair action. It is a log notification, not a fault. Dismissing it and resetting the clock restores full function immediately.
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2
Check the circuit breaker if PF appears without a known outage
If PF appears but you did not notice a power outage, check the breaker panel for a tripped breaker on the microwave circuit. A tripped breaker that self-resets (rare but possible) would cause a brief power interruption and PF without an obvious outage.
Frequent PF notifications in the absence of utility outages can indicate a marginally sized circuit that trips under load. If a shared circuit is serving both the microwave and other high-draw appliances, an electrician should evaluate the circuit capacity.
When to Call a Professional
Contact a qualified technician if:
- Circuit breaker trips more than twice in a week when the microwave is in use
- PF appears every few hours suggesting repeated brief power interruptions
- PF clears but a genuine fault code appears immediately after dismissal
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