Whirlpool Cabrio washer LF error code during wash cycle - fills but stops mid-cycle without draining.
LF indicates a Long Fill; the washer didn't start the agitation part of the wash cycle. It either took too long to reach the needed water level or the water level pressure switch didn't send the signal to the control. Sometimes, the control board can't receive the signal. Since you are getting water into the washer, check how fast the water is coming in. The system is expecting to fill in about 8 minutes. Since the water level is determined by a difference between air and water using a hose to the pressure switch, check that the pressure switch hose isn't pinched or damages. Also make sure that there isn't a clog in the hose. You may need to replace the pressure switch assembly. Check the wires to the pressure switch and at the control board for damage or corrosion on the connections. If the wiring is good, the control board may need to be replaced if replacing the water level pressure switch doesn't solve the problem.
I hope this helps. If you need a parts list, please add a comment with the model number of the washer. (It's usually on the frame of the washer under the lid and on the back of the machine.) Since the washer is 15 years old, you may need to consider replacing it, if the control board is faulty.