Timer seting setting the timer on a clearwater C200T

It is an electro-mechanical timer, so it can only be that that particular tappet is broken or bent, or in the wrong way.

4001 00 by AMF PARAGON Buy or Repair at PLCCenter PLCCenter com

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look at instruction manual there is a setting you probably have to set

clean and use filter lube but replace that will solve your problem

The first thing you need to do is get it on its side in an area that you can empty the sand out of the tank.
Use a garden hose to wash out the sand.
Rod
US Parts Center

If the timer does not keep the time of day then it is faulty and needs to be replaced.
Timers have adjustable tabs to turn the timer on and off at a set times of day.

Boy you know you're in trouble when a web search for your product gives fixya on page 1 google.
There is a product manual for your dehumidifier Sept 2012: but it doesn't say how to set the timer. What a doofus manual.
http://www.danby.com/cms/products/en_manual/Manual_for_DDR26114011_%282%29.pdf
There is a customer care phone number:
http://www.danby.com/en/CA/customer_service

On and OFF are probably manual override, so you can operate unit without timer.
24 hour means a 24-hour military-time clock without am and pm. So 1pm is hour 13, and 8pm is hour 20, and 1am is hour 1, etc.
+/- set the humidity

Best guess for Seting the timer.
Press and release clock (timer) button. You may have to press and hold.
And probably auto start is first thing on menu.
Press + or - button to select start hour from 1 thru 24.
Press clock (timer) button again.
And probably auto stop is next.
Press + or - buttons to select stop hour from 1 thru 24.
Probably you press clock button again to exit timer programming.

Try using 12:01am (night) to 11:59am (just before noon)
-or-
12:01pm (afternoon) to 11:59pm (just before midnight)
so the day is the same, and the timer will not get confused.
More resources:
http://waterheatertimer.org/Woods-timers-and-manuals.html#Timex

if filters ok check sensor and cell

http://www.cleanwaterstore.com/O1002250-p-clearwater-tech-parts.html