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In my case, I pushed the button, the housing goes fully up, then right back down. I removed and disassembled the unit for cleaning. After Assembly I located two microswitches that cause the extension moror to stop at the top and at the bottom of the swing. In my case, the inertia of the motor caused the unit to "Coast" thru the top of the stroke and continue back down. I bent the outer 1/3 of the metal tabs that depress the microswitches so that the unit stopped rising a wisker sooner and no longer goes back down without pushing the button. The same coasting theroy may apply at the bottom of the stroke. The motor that runs the up and down motion is controlled by three switches, the two limit switces plus the momentary push button switch. If you don;t need to completely remove your unit for cleaning, the microswitchs can be located by removing the fan housing and looking up from inside the cabinet (under the stove) on the right side. IN my case, there was 10 years of goop to be removed.
Had same problem & fuse fixed it.
Before buying a new control board (approx $160), check the 3 amp fuse located on the inside of the vent on the control board. You have to take the light/bottom housing & black plastic air chute off to see control board/fuse.