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Please recheck the error code. Are you sure the code is P4 and not F4? Carrier does not list a P4 but it does list an F4 error code. F4 means outdoor mid-coil temperature sensor malfunction. Or how about E4? E4 means compressor discharge high temperature protection.
If you have any later digital camera or phone with a compatible connector and cable, try connecting this first.
The set may be looking at the wrong input for signal.
Using your remote, check the setup menu to ensure that your source (cable, receiver, etc.) hasn't been accidentally changed.
Often, a blue screen means 'no signal.'
If you wish to buy a genuine remote control, you have to contact the authorized service centre for Mitsubishi. If you wan to buy a universal remote control, you should first check, which brand remote control have setup codes to Mitsubishi brand TVs. If you wish to get this detail, try the links given here. It has setup code list, and setup procedure to many popular brand remote controls. Check and find out which brand remote control have the codes to Mitsubishi, and buy that one according to availability. http://electrohelponline.blogspot.com/ http://electro-medical.blogspot.com/
This sounds strange but if you have a mobile phone with video recording on it, run the video whilst pressing the remote control. If you point the camera at the end of the remote (Where the glasslike bubble is), you should see it flash ( On the camera) You will not see anything with the naked eye, you must look at it through the camera while on video record. If you see a flashing, it means the remote is OK and you will need what is called " a receiver board" in the indoor unit of your aircon. If it doesnt flash, it means the remote is faulty. Try the manufacturer for a replacement .
Bye the way, any remote control can be tested in this way... try it with your TV remote to confirm it works..
we have a split type gree aircon, with one (1) horsepower. it was just newly installed, around 6 months ago. we are just surprised that one when my wife turned it on, thru the use of its remote control, the indicator box on the aircon reads or flashes "F2". I detached the batteries of the remote control for severa hours and I also detached the power cord from the wall socket, but it was to no avail. it did not work. with "F2" on the indicator box, the aircon won't give cool air, it is just working like an ordinary fan. please help us.
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