Sounds like to me the, the timer  contacts are stuck closed. The timer 
contacts AND the door switch are wired in series. Both must be closed 
for the motor to run. Depending on the controls, the door switch could 
be only an input to the timer assembly, and a relay, or CPU to actually 
control the motor. Many times there is a wiring diagram on one of the 
removable panels. Or Google for the model number and manual or 
schematic, etc. Should be able to find a wiring schematic on line, and 
possibly even a repair manual with troubleshooting that will identify 
the offending part.

This is a safety issue, and should be corrected! In the mean time 
disconnect the power from the unit.
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