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My LG dishwasher model lds5811WW/02 shows error code "PF" which I know is power failure. I tried online suggestions of the on/off switch, but it will only let me start the dishwasher with the soap dispenser working at odd times, if at all. I tried shutting off the breaker and the PF code keeps showing up. Does anyone have an alternative fix for this?
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Hi @givande,
Have you verified that the wall power outlet that the dishwasher is connected to is working OK by plugging in another appliance e.g. hair dryer and checked if that worked OK?
If the power at the wall outlet is OK then an intermittent problem in the dishwasher operation coupled with an indication of a power fail condition to me indicates that there may be a problem with the control board part # 6871DD1006A (supplier example only to show board).
This board not only controls the dishwasher operation but also converts the incoming power to a DC voltage to operate the other boards e.g. display panel boards.
If you have a DMM (digital multimeter) you can check if there's the correct AC voltage value appearing on the control board connector WH3 pins 1 & 3 and if so then visually inspect the control board for any signs of obvious damage or corrosion.
Here's the service manual that will help.
If you decide to replace the control board usually the board number is shown somewhere on the board itself, if you wish to verify that you're ordering the correct one
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