Hello. There is a test to check the water sensor directly using diag mode. From the service manual: Select a cycle and start the washer. Enter service mode and press *Extra Wash*.
Turn the dial so that the *delicate LED* is turned on. Next, press the start/pause key. The Water Frequency will be displayed. The frequency will change as the washer fills. I hope you can read the text in the pic below...note in the lower left corner how to turn on the drain pump for that particular model of your washer. I've included a part of the schematic diagram showing the pressure sensor. To check if the pressure tube or air chamber is blocked, remove the black tube from the sensor, blow into it. You should hear air blowing inside the tub and have very little resistance to your air. What can happen is mold/mildew can form inside the air chamber or the hose and block it. Also, cheap detergents can do the same thing when bubbles dry up in the tube. MAKE DARN SURE THAT TUBE IS PUT BACK AND FITS TIGHTLY ON THE PRESSURE SWITCH--if it's loose, you can flood your house because the lack of pressure will tell the sensor to keep adding water in the washer. Conversely, if the hose is blocked, the sensor may think the washer already has water and nothing will come in. BTW, no matter if there is water in the machine or not--IF YOU PRESS *SIGNAL*, THAT PUMP BETTER START RUNNING! Now, there are instances where the information on the diag mode is INCORRECT. I run into this fairly often and have to call my tech support dept for clarification--usually there has been a software change--If the tech has already changed the main board, wiring harness(really rare for that to be bad), the pump, door switch, etc., my goodness, there isn't really anything left! There *is* a possibility that the user interface board is defective--look at it logically, if the main board, wiring harness, pump and door switch have all been replaced(that covers all the connections), and you even verified that power was getting to the pump through the wires, then, if the button on the front panel won't activate the pump, the board could be bad. Does the loudness of the beeps change when you press the signal button? It is fairly common to have a shorted or open connection on the user interface causing problems--have you had a power outage recently--3-4 weeks before the problem started? Surges are NOTORIOUS for damaging the boards in these puppies. I recommend to all my customers to have a whole-house surge protector installed in the breaker panel. Lemme know how you fare--sorry for the long-winded help! I hope I've provided some insight to help you! ALSO, NOTE THE RESISTANCE FOR THE WATER LEVEL SENSOR AS 22 OHMS-24 OHMS (+/-10%). Look at the pin outs on the schematic!