So a few months back, the fan switch knob came off when I turned up the fan speed. I was able to use some 'super glue' to reattach it and I have been careful with it since, Seems to be working ok. Yesterday the temp control knob came off... coincidence or ?? Haven't tried the old 'super glue' trick yet, but it seems strange that they both have come off. Looking at the parts manual and various pictures, it looks like they shouldn't have come apart that way. I found a good price on a used one (ebay) so I might beef them up before replacing the unit. Anyone run across this??