If your LG dishwasher powers off mid cycle and shows PF error, it can be extremely frustrating. The unit suddenly shuts down, the display goes blank, and after a few minutes it comes back as if nothing happened.
You restart it, it runs for a few minutes again, then shuts off. Over time, the runtime gets shorter, making the dishwasher almost unusable.
Quick Answer
If your LG dishwasher powers off mid cycle, the most common cause is a failing main control board (PCB) or power-related component overheating.
The PF error confirms an internal power interruption.
Step-by-step solution to fix LG dishwasher powering off mid cycle
Step 1: Confirm house power is stable
Since your issue started after power fluctuations:
- Test the outlet with another appliance
- Check for voltage drops or loose connections
If external power is unstable, fix that first.
Step 2: Observe the failure pattern
Your symptoms are key:
- Runs for 2–10 minutes → shuts off
- Works again after cooling → fails again
- Runtime decreases with repeated attempts
This strongly indicates heat-related component failure.
Step 3: Check power reaching the dishwasher during failure
When it shuts off:
- Use a multimeter
- Check if power is still reaching the unit
If power is present:
- The issue is internal
- Not the breaker or wiring
Step 4: Inspect the noise filter
The noise filter (LG p/n 6201EC1006T) stabilizes incoming power.
- If faulty, it may cause intermittent shutdowns
- Check for:
- Burn marks
- Loose connections
If power still reaches the PCB, the filter is likely OK.
Step 5: Inspect the main control board (PCB)
This is the most likely failure point.
Check for:
- Heat damage
- Burnt smell
- Swollen components
- Discoloration
The main PCB (EBR33469404):
- Distributes power
- Controls all functions
- Feeds the display and control panel
Step 6: Understand the overheating behavior
What’s happening internally:
- A component heats up during operation
- It fails temporarily → dishwasher shuts off
- After cooling → works again briefly
This cycle repeats and worsens over time.
Step 7: Access and inspect internal boards
To inspect:
- Disconnect power
- Open control panel
- Locate main PCB
Look carefully for any visible damage.
Step 8: Replace the main control board if needed
If you find damage or symptoms persist:
- Replace the main PCB assembly
- Verify part number on your board
This is the most common fix for this issue.
Extra tips and best practices
- Use a surge protector to prevent future damage
- Avoid running dishwasher during unstable power
- Ensure proper ventilation inside the unit
- Keep internal electronics dry
Common mistakes to avoid
- Assuming PF error is always external power issue
- Ignoring overheating symptoms
- Replacing random parts without testing
- Skipping PCB inspection
- Continuing to run the unit after repeated shutdowns
FAQ
Why does my LG dishwasher shut off mid cycle?
Usually due to internal power interruption caused by a failing control board.
Why does it work again after a few minutes?
Because the faulty component cools down and temporarily functions again.
Can power surges damage the dishwasher?
Yes. Sudden power fluctuations can damage control boards and internal electronics.
Conclusion
If your LG dishwasher powers off mid cycle and shows PF error, the issue is almost always internal. Based on your symptoms, the most likely cause is a failing main control board overheating during operation.
Start with power checks, but focus on inspecting and replacing the PCB if needed. That’s usually the permanent fix.
Reference Links
https://www.lg.com/support
https://www.ifixit.com/Device/Dishwasher
https://owner.electrolux.com/support-articles/article/1819543-dishwasher-not-drying
