A/C will not respond to remote control.

Red 4 Flashes Green 4 Flashes Power Failure

Off 3 Flashes Reverse Comms Fail In Use

I have one of these units and it has had its fair share of troubles, but great when it is working. My latest issue is the the flap on the indoor unit doesn't open!

This generally works for me. Pull out the isolator outside on the wall or disconnect at the breaker. Leave for a couple of hours. Reconnect and wait 15 minutes. If you are connecting via the isolator you will hear relays clicking and solenoids rattling as the unit goes through a Self Test procedure, then try normal operation.

Blink Codes and Troubleshooting.

https://www.orionair.co.uk/PDF/fujitsu-trouble-shooting.pdf

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Start by replacing the batteries to your remote control and make sure there is nothing blocking the IR receiver on the unit itself. If that is blocked by something hanging on it or tape over it from something hanging on it previously.

Hi Rismita,
I hope the following link is helpful for you
Good luck
http://errorcodeairconditioning.blogspot.com.au/2010/10/fujitsu-air-conditioner-error-codes.html

Hello,
Please check your batteries in the tv remote as they appear to be weak or dead. You will need to find the cable remote's paper guide in order to properly program the cable remote so it can change channels, volume, and power functions on the tv set.
Good Luck!
Rich Lilja

I think my friend that is the indoor air thermistor,you must replace it.

If it appears that your panel is lighting but you have no picture you have one of two problems. Either your T-con is bad ( most likely ) or your main board is bad.

Need to buy an air conditon remote control unit model AR-DJ2

Check your remote control by using a camera or cellphone camera as your eyes to confirm if the remote control is ok. Point the remote control transmitter to your camera and check if a light emits in your remote control transmitter. If no light then the remote control is defective, but if the light is present then the remote is ok and the unit receiver board itself is defective.

Check also if there is a reset or rst button on the remote control, press the button and test the remote.

Check if the remote control if still good, using the camera of your cellphone point remote control to the cellphone camera and press the "on" button of your remote and you can see the light emitting from your remote control transmitter. If the lights emits that means your remote control is good, if not means the remote control is defective.If the remote control still good try to press the RST or RESET button on your remote control and try. If wont works it means that the reciever board in the indoor unit is defective.

Maybe the unit is on test run, try to push the test run button of remote control pointing the remote to the unit receiver.