Why does't control panel light up when on/off button pressed?

as there are two control boards in ac units ( split systems) and one in a window unit
it could be the inside board ( they do not suffer power surges to well or vermin infestations at all )
before you waste more money I suggest that you get a technician in to determine the fault and if parts are readily available.

Turn the Master ON/OFF Switch to OFF and unplug the unit for 15 minutes. This will give the electronics time to revert back to the original factory setting. The plug the unit back in and turn it ON.
When you press the Arrow Down button, do so in increments. Do Not push and hold the button.

If that does not solve the problem, you may need to replace the control panel.

Hope this helped you.

Hi,

There are many reasons why a dehumidifier will not work or collect water.

Here is a tip that I wrote to help people to figure out what is going wrong with their dehumidifier

Dehumidifier is running but no water is in bucket

heatman101

,./;';'

On the control panel the 3rd button from the left is the timer button. If you press this button when the unit is running the number display on the left will start blinking- use the up/down arrows to set the time that you want the unit to run.
If you press the timer button when the unit is off it will run on and off for the designated time you set- eg if you set 1 then every 1 hour the machine will switch on and run for 1 hour.
(The left # will just blink once you have the time you want just leave it and eventually the normal humidity setting reading will show)

I don't think it's a thermistor problem, as previous respondents have suggested. I have one of these units. The control panel has been nothing but trouble. The Power button works, but the Fan Speed button is stuck on High. The Humidity Up/Down buttons only work sporadically. Sometimes they work if I keep punching them. There doesn't seem to be any rhyme or reason as to when they work and when they don't. I think they're just cheap parts that have failed prematurely.

Power button on mne is on the far left of the control panel.

power button does nor work

the control board is a very simple design and it is to signal and switch options like fan speed, power on/off, humidity up/down and sets the on/off run time. Like above the board does collect dust,but the true problem runs deeper.

My unit was stuck in run mode with the fan speed, humidity and run timmer non functioning. the unit worked and the power switch turned it on and off. The display said ON

I removed the front cover (two screws) and slight pressure on the side of the cover to remove it. This exposes the control board. The control board can be removed by removing the 6 screws on the board. the cable can then be removed by pulling out the multi-pin ribbon cable.

I diagnosed that only two of the 5 push button switched were functioning. There was also dust and mold on the board. This board is poorly protected from the moist air entering the unit and the constand moisture causes corrosion on the board, the switched seem to be the weak link.

By using a multi meter I noted that only the power switch and the humidity down button were making contact when pressed. Now it all came together. I could turn it on and off. and if you press the humidity down button to the lowers setting (ON) means run all the time.

I used a elecronic contact cleaner and sprayed it into each of the switches. I wiggled it around and blew it out with canned air. It took a few wiggles and blasts but all switched then made contact. I the board back on and tested all functions and it was like new. The contact cleaner should keep it protected for a while. The non functioning of the switches works both ways. They can stick on also. This would explain most of the other control problems. These switched are common and can be picked up at Radio Shack. On a do-it-yourself bananna scale it was a 2 for me, but I had the tools and the spray. I am not sure what sears gets for the PC control board,but this is the issue and if they were to address this the unit complaints would drop greatly.

first check that the bucket is in properly. then remove bucket and push red button with finger with the unit on. if you are still getting a red alarm light it might be time to change the control panel. also unit does not work the same in cold weather. it will cycle too often. unit better used in summer-------good luck

Sounds like the button may be broken. However, it could be a loose wire. Take the front off and see if any of the wires connecting the control panel and the unit are loose or disconnected.

If there is a ribbon cable connecting the control panel, see if any of the contacts are exposed when you disconnect it. If they are, you may be able to use a pencil eraser to clean them off. A service man from Sears did this on the control panel for my ceramic-top stove. He said if that didn't work then I would have to buy new control panels, which were almost the cost of a new stove!