If your LG dishwasher PF error keeps showing and the soap dispenser works randomly, it can be frustrating. You reset the breaker, try restarting, but the problem keeps coming back.
This issue is common in models like LG LDS5811WW/02, and it usually points to a deeper electrical problem rather than just a simple reset issue.
Quick Answer
The LG dishwasher PF error means power interruption, but if it keeps happening, it’s likely caused by a faulty control board or unstable internal power supply.
The soap dispenser issue is often linked to the same problem.
Step-by-step solution to fix LG dishwasher PF error
Step 1: Check the wall power outlet
Before opening the dishwasher:
- Plug in another device (e.g., hair dryer)
- Confirm the outlet is stable
If the outlet fails, the issue is external.
Step 2: Inspect the power cord and connection
Look for:
- Loose plugs
- Damaged cable
- Burn marks
A weak connection can trigger repeated PF error codes.
Step 3: Perform a full power reset
Do this properly:
- Turn off breaker
- Wait at least 5–10 minutes
- Turn it back on
Short resets sometimes don’t clear internal faults.
Step 4: Check internal wiring connections
Loose wiring inside the dishwasher can cause intermittent power loss.
- Open access panel
- Inspect connectors
- Ensure everything is firmly connected
Step 5: Test voltage on the control board
If you have a multimeter:
- Locate control board connector WH3
- Check pins 1 & 3 for correct AC voltage
If voltage is stable but PF persists, the issue is internal.
Step 6: Inspect the main control board (PCB)
The control board (part #6871DD1006A) is critical.
Check for:
- Burn marks
- Corrosion
- Swollen components
This board:
- Controls all dishwasher functions
- Converts AC power to DC for internal components
Step 7: Understand the soap dispenser issue
If the dispenser works inconsistently:
- It’s likely not the dispenser itself
- The control board may not be sending proper signals
This is why both issues appear together.
Step 8: Replace the control board if needed
If all checks pass:
- Replace the main control board
- Verify part number on the board before ordering
This is often the final fix for persistent PF errors.
Extra tips and best practices
- Always use a surge protector if possible
- Keep the dishwasher dry internally (avoid moisture on electronics)
- Double-check part numbers before replacing components
- Use original LG parts for reliability
Common mistakes to avoid
- Assuming PF error is always external power failure
- Ignoring control board inspection
- Replacing the soap dispenser unnecessarily
- Skipping voltage testing
- Doing quick resets instead of full resets
FAQ
Why does my LG dishwasher keep showing PF error?
It usually indicates unstable power or a faulty control board, especially if it persists after resets.
Can a bad control board affect the soap dispenser?
Yes. The control board controls timing, so it can cause random or failed dispenser operation.
Should I replace the control board immediately?
No. First confirm:
- Power supply is stable
- Wiring is intact
- Voltage is correct
Conclusion
If your LG dishwasher PF error keeps appearing and the soap dispenser behaves unpredictably, the root cause is likely internal. In most cases, the issue points to a failing control board or unstable power delivery inside the unit.
Start with simple checks, but if everything else looks fine, replacing the control board is usually the most effective solution.
Reference Links
https://www.lg.com/support
https://www.ifixit.com/Device/Dishwasher
https://owner.electrolux.com/support-articles/article/1819543-dishwasher-not-drying
