The window air conditioner has an electronic control board. The control board should be replaced if it doesn't work properly.
Follow these steps to fix your issue:
Disconnect electrical power
The wall outlet has a power cord.
Pull the air conditioner out of the window
The accordion filler panels are in the window frame. To clear the window frame, push the accordion filler panels inward. Support the air conditioner and raise the window sash with someone's help. Lift the air conditioner out of the window and put it on the work surface.
Remove the front grille panel and filter
Pull the front grille panel out of the air conditioner by grasping the sides of the panel at the top. The filter needs to be removed. If necessary, clean the air filter.
Remove the control panel
The control panel has screws on it. Pull the control panel up and hold it above the air conditioner to remove the wire harness connection for the user interface control board. The control panel should be left alone.
Remove the front panel
The front panel has screws on the sides. Put the front panel of the air conditioner away.
Remove the outer case
The screws need to be removed from the exterior of the case. The center stop needs to be removed. There is a hidden screw under the center stop. Remove the outer case from the air conditioner by pulling it outward.
Remove the electronic control board
The electronic control board case has screws. The electronic control board case needs to be pulled out to expose it. If you want to connect the new electronic control board correctly, you should take a digital photograph of the wires that are connected to it. All wires are removed from the electronic control board. Pull the electronic control board out of the case by removing the mounting screws.
Install the new electronic control board
(not-been-paraphrased) Position the electronic control board in the case and reinstall the mounting screws. Using your photograph or other documentation as a guide, connect all the wires to the new electronic control board. Make sure that wires are properly routed so that they’re not pinched or damaged during reassembly. Position the cover of the electronic control board case and reinstall the screws. Tip: Make sure that wires aren’t pinched when reinstalling the electronic control board cover.
Reinstall the outer case and front panel
Remove the screws from the air conditioner and place the case on it. Put the front panel on the air conditioner and put the mounting screws on the sides of it.
Reinstall the control panel
Plug the user interface control wire harness back in if you position the control panel above the air conditioner. The control panel should be positioned on the front of the air conditioner.
Reinstall the front grille panel and filter
The front of the air conditioner has a filter on it. Attach the front grille panel to the air conditioning unit.
Restore the power
Attach the air conditioner to the electrical outlet.
You would need the following tools:
phillips screwdriver, work gloves.
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