We have a 15yr old Neptune. It had the Q6/R11/wax motor repair in 2004 and the motor/motor control replaced in 2011 and worked fine until a few days ago. Now, when you push the Start button, in ANY timer position, the ON light comes on and the machine begins whatever function is selected, but shuts off after EXACTLY 10 seconds. You can restart the machine and slowly step through a cycle, but it shuts down repeatedly at 10 seconds. This occurs even in the Delay mode, when the machine is doing nothing except running the timer motor.
I have run all the motor/motor control tests and it all checks OK. If I disconnect JP4 on the control board and the L/N (black/white wire) connector and connect a cheater cord in its place, and plug directly into an outlet, the drum turns at 50rpm as advertised, and will do so indefinitely. If I put the timer in delay mode, disconnect JP4 (with L/N plug connected) and push the Start switch, the drum will turn at 50rpm for EXACTLY 10 seconds.
This all seemed to indicate a failed main control board, but I replaced that with a new one, and the machine acts exactly the same. I have selectively disconnected almost everything in the machine - motor, main/recirculate pumps, water valves, etc. - and as long as the control board has power, it will operate for 10 seconds and then quit. The only other thing common to all functions is the timer, so I removed it, pulled the contact module off, and visibly examined and manually tested (ohmed) every set of contacts, and found no problems. The timer motor, when connected to external power with the cheater cord, functions normally.
I could proceed to replace the timer, motor, and motor control, but I fear that I will throw all that money at a 15yr old machine (still in excellent condition otherwise, however) and it still won't work.
Any thoughts or suggestions (other than buy a new one!)?