How to replace a window air conditioner ambient thermistor

Unplug the power cord from the wall outlet.

Remove the screws that hold the accordion filler panels in the window frame.

Push the accordion filler panels inward to clear the window frame.

With someone’s help, support the air conditioner and raise the window sash.

Carefully lift the air conditioner out of the window and set it on a stable work surface.

Grasp the sides of the front grille panel at the top and pull the front grille panel out and off of the air conditioner.

Pull the filter out.

Remove the screws from the sides and bottom of the control panel.

Pull the control panel up and hold it above the air conditioner. Unplug the wire harness connection for the user interface control board.

Set the control panel aside.

Remove the screws from the sides of the front panel.

Pull the front panel off of the air conditioner and set it aside.

Remove the screws from the exterior of the outer case.

Remove the center stop for the accordion filler panels. Remove the hidden screw that is under that center stop.

Pull outward on the bottom of the outer case and remove the outer case from the air conditioner.

Remove the screws from the electronic control board case. Pull out the cover of the electronic control board case to expose the electronic control board.

Disconnect the black ambient thermistor wire from the T1 connector on the electronic control board.

Pull the ambient thermistor out of the mounting clip on the front of the evaporator.

Insert the new ambient thermistor in the mounting clip on the front of the evaporator.

Plug the wire harness for the ambient thermistor into the T1 connector on the electronic control board.

Position the cover of the electronic control board case in place and reinstall the screws.

Position the outer case properly on the air conditioner.

Reinstall the screws in the outer case including the hidden screw in the center.

Position the front panel on the air conditioner and reinstall the mounting screws on the sides of the front panel.

Position the control panel above the air conditioner and plug the user interface control wire harness back in.

Position the control panel on the front of the air conditioner and reinstall the mounting screws in the control panel.

Insert the filter on the front of the air conditioner.

Position the front grille panel on the front of the air conditioner and snap the grille panel into place.

Plug the air conditioner into the electrical outlet.