When machine does not advance to Spin, the problem is either related to motor and motor control faults, to drain problems, or to agitator itself.
The first step in troubleshooting is checking if the machine is draining or not.
If the machine does not complete drain cycle before advancing to spin, then it is a drain related problem.
- If the problem is drain related, inspect the drain hose at the back of the machine as a first thing.
- Access the drain pump, and undo hose from the drain pump. Check filter if present, and remove eventual blockage in there. This procedure is usually illustrated in the user manual. Before accessing the pump disconnect power.
- Test the drain pump itself (try to understand if it running or not).
- If pump and lines are good, then the pressure switch that determines water level must be tested and eventually replaced.
If there is no problem with drain system the rest must be tested.
The variable speed motor and the motor control unit (internal module connected to motor and to main control) must be tested. Main control unit must also be tested at last.
This parts are more difficult to test. Part of the testing is done reading Volts and working with live power, or jumping devices to understand if they were causing the problem.
this part of the testing must be done by a technician.
If motor, MCU, and electronic control (CCU) are fine, then the problem may be mechanical.
In your case you stated that you have a motor coupler, and that motor and coupler are fine.
The first part to test is the drain system, the ultimate test will be bypassing the pressure switch to check if that was causing the problem. As said this kinds of test must be done by a technician (I have to mention this).
As you will probably know , parts and diagrams are available at Sears Parts & Accessories Website .