I have a strange problem with a Bosch Axxis washing machine model WAS20160UC.
The machine will work fine for a while, then stop with an F18 error. I can't find the error in the service manual or training presentation, but I found it with a Google search. What is happening is that when the drain pump stops pumping for about 20 seconds with water still in the tub, an F18 error occurs. I did a manual drain, and opened up the drain pump impeller housing (there is a screw-on cap). The impeller is clear, and the shaft turns freely. I then put the maching on drain, and press start, and the drain solenoid clicks open, but the pump doesn't turn. I do this a couple more times, and the impeller starts turning. I then put everything back together, and it will run for several loads, then quits with the F18 error. I haven't taken apart the machine to test the pump windings, but the windings on these things are reasonably heavy, and I would be supprised to have an intermittent broken winding.
I would have suspected a bad bearing in the pump, but the shaft turns fine. When I turn the impeller, I can feel a magnetic pull ever 1/2 turn or so, so I suspect this pump has a magnetic rotor (Bosch uses the same arrangement in their dishwashers.
Anybody got a clue as to what is going on? Is this a common problem with these machines?
Thanks in advance.