Error code E3 on fedders window unit. unit will only turn on for a few seconds, fan and compressor both when you hold the power button down for a few seconds but then turns off almost immediately.

Even after replacing thermostat and motherboard offered from company, my heater would trigger e3 error code and shut off. After several (maybe 100!) different attempts to plug in and operate, here is what worked for me!
Depress the power button on the heater while plugging in to wall circuit. Continuously depress power button. It will run through a test cycle and attempt to start. Keep depressing the power button as the heater tries to start, then shuts down with e3 error. While the power button is still depressed, unplug the unit from the wall. When I plug back in the wall the E3 error is gone. Good luck

Try this : Start the unit using the remote control, after that push the C button of remote control if C display at the unit then off the unit and plug out the power supply. Then plug in again and "on" the unit using the remote control.

Do not allow the signal receiver window to receive strong direct sunlight, since it can adversely affect its operation. If the signal receiver window is exposed to direct sunlight, close a curtain to block the light.

Using a Fluorescent lamp with a quick starter in the same room may interfere with transmissions of the signal.

The unit can be affected by signals transmitted from the remote control of a television vcr or other equipment used in the same room so make sure if anything recently added to the room is un plugged for testing purposes.

Do no leave the remote control in direct sunlight or near a heater also protect the unit and remote control from moisture and shot which can disclour or damage them.

Check whether the remote control batteries have become old and weak. (replace with new ones)

Try to send the signal again with the remote control pointed properly towards the units signal receiver window

Check whether the remote control batteries are installed with the polarites properly aligned

This could also be a result of the error locking out the remote as well so keep this in mind.

Also if possible unplug it and let it sit for atleast a day then plug it into a different outlet (if possible) to see if there is any change in the units functionality.

After that I would have to say check the area around the base of it and make sure that there is no moisture damage to the unit.

A good cleaning could be in order as well.

then if all else fails and the error presists contact customer service with the issue of the machine they will know what the error codes are.

hope that helps let us know how you make out.

Hello Gm,

Please check printer is turned on by pressing the "On/Off" button, you will notice the display prompt you for E3 (error 3). Press and hold the "On/Off" button for one second. The display will go blank and begin resetting the malfunction. Wait 10 to 15 seconds and restore power to the unit by pressing the "On/Off" button once more. Allow the unit to complete its cycling process and the error code should be gone. If the code persists, your printer will need professional maintenance.

Follow the below mentioned steps to resolve the issue : 1. Ensure the Pixma is turned on by pressing the "On/Off" button, you will notice the display prompt you for E3 (error 3).
2. Press and hold the "On/Off" button for one second. The display will now go blank and begin resetting the malfunction.
3. Wait 10 to 15 seconds and restore power to the unit by pressing the "On/Off" button once more.
4. Allow the unit to complete its cycling process and the error code should be gone. If the code persists, your printer will need professional maintenance.

Follow the steps below....

1. Power down the air conditioner using the "power" button on the front
panel.
2. Unplug the air conditioner from the wall socket.
3. Hold the front panel "power" button down and plug the air
conditioner in. Continue to hold the power button down as the machine
goes through a brief test sequence (fan & compressor each come on
briefly, etc). There is a "beep" sound at the end of the test sequence,
and the machine will be off. At this point, you can release the power
button.
4. Unplug the air conditioner.
5. Plug the air conditioner back in.
6. Congratulations! You should now be able to operate the air
conditioner normally for another 720 hours, but only if you followed
the instructions above EXACTLY.

If the compressor only turns on after the units it's shut off then it is a control board problem (stuck relay)

E3-40 is a toner density sensor error. It's probably toner getting built up on the sensor. It's located under the drum. It will look like 2 little LED looking things on a little circuit board about 3-4 inches long and half an inch wide. You can blow it out with canned air.
If that doesn't work, then the sensor needs to be replaced.

If the fan will no run at all iit may have a capacitor bad, swelling around the top, or you may just need to replace the motor.

I would try to start the unit with only the fan running at first. If it stays running then cycle on the compressor and see how it does. If the unit does not operate when compressor is turne on then we have to dig deeper into that.