Troubleshoot Bosch DHD8005UC downdraft system which has ceased to raise & lower automatically?
While I don't have a schematic, there is not much to the system. In my case, I removed the entire unit (stationary and mobile parts) and cleaned all the grease out. Be prepared to do this outside on a picnic table with a paint scraper and grease bucket.
Our unit would raise ok, then go right back down. There is a cam that raises the unit up and down. That same cam impacts a couple of micro switches. The push button switch over comes the raise limit switch when it's time to go back down. The limit switches (one up one down) have small metal tabs that get disturbed by grease and increased weight of the grease. After cleaning, just bend the upper limit tab just a little so it is tighter. On my mine, the unit would lift, then coast over the top of the cam profile and go back down. By bending the metal tab connected to the raise limit switch so the switch was more fully engaged sooner (earlier) to the top of stroke, the unit will stop where it should. Pressing the button again by passes the raise limit switch so the cam continues and the unit goes back down. I wish I had taken pictures when I did this. It really is very simple.
Feb 27, 2015 |
Bosch DHD 805 Kitchen Hood