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Hello Faye, The F4 error code is a drainage error and it means that the control board did not detect a drop in the water level in the tub so it thinks it didnt drain. The things that could cause this are a clooged filter on the pump asm, a blockage in the drain pump or hose or even a defective control board if in fact all the water has seemed to drain out of the tub.This is how ya set the diagnostic test to clear the codes and see if it reoccurs
Make sure the appliance is empty of water before running Diagnostics as it does not pump out before starting to fill and therefore you could overfill the appliance.
Open the door and set the program to the first program. (Normally rinse).
Turn the power off.
Press and hold the start button and while holding turn the power on.
After a little while the start button will flash, release the button.
Press the start button once and close the dishwasher door.
The machine will now run through a diagnostic routine.
Diagnostic takes about 20 mins.
The machine will stop during diagnostics if an error is found and will display the error code. If no error is found it will complete the diagnostics and end the program.
To exit diagnostics at any time just press and hold the start button till the program is cancelled.
If you have F4 and the sump is full of water, there's a good chance the drain pump is being jammed by a broken bit of glass or pottery. However, if the appliance is empty of water and F4 error code is flashing, where do you go from there?
The electronic control (module pcb) does a self check of the components, during a drain cycle the programme allows a time parameter for the appliance to empty away the water. How does the pcb know the water has gone? Simply by testing a pressure switch for continuity.
The pressure switch is an on or off switch, when the appliance is empty the internal contacts are "made" (on) when the appliance is full of water the switch is "broken" (off).
The sensing grid of the pressure switch is exposed to the dishwasher wash water and can over a period of time get clogged with crud ( a mixture of food waste and detergent and limescale), eventually this crud stops the switch from being in the correct attitude during the self tests. The electronics notes the on or off and determines that the appiiance has not drained and gives error code F4.
If you have F4 error code it could be the pressure switch needs cleaning or replacing.
On the self test about 4 mins is allowed for the appliance to empty the water away.
Hello Sir, This error code, " F4 " comes only when the waste outlet is totally clogged with waste and blocked. Try to dismantle the machine and locate the Waste outlet pipe and thoroughly clean it. This will reset the error which is caused.
There may be excess water in the water reservoir. Empty the washer Turn it off at the mains, and unplug it, then put some old towels on the floor, tip the washer forward until the excess water comes out, Reconnect and try again. Hope this helps it works for me and saves ££££'s in repair fees