Read the manual booklet it will tell you to press a certain button on the remote control and it will display an error code on the remote control.
I have the same problem before, the error code on remote control tells me that the refrigerant pressure is too low (not enough refrigerant)
Add more refrigerant and the problem solved. (to add refrigerant, you need to call aircond technician)

Panasonic aircond error code:
http://errorcodeairconditioning.blogspot.s...error-code.html

This post has been edited by tanhks: Jan 1 2013, 09:19 AM