I have a Frigidaire Gallery model plhs267za. The refrigator doesn't freeze or emits cold air. When I turne it off for a coule of days it works again. The technician says compressor is ok as weel as fan system. Please help

Freezer coil is plugging up with frost, Your problem is defrost timer or heater related. If it is the timer you can located the timer and rotate the Clutch screw for the timer, turn it very slowly Clockwise until you hear one click. The compressor will shut off and the defrost heaters will turn on. Waite about 25-30 minutes and if the refrigerator does not restart (Normal time would be 18-22 minutes) rotate the screw again clockwise small amount and it will start cooling. Observe the drain pan for defrost water. If the refrigerator restarted (18-22 minutes) and no water is in the drain pan you problem is defrost heaters. If after the 25-30 minutes the refrigerator did not restart on its own and water is in the drain pan your problem is the defrost timer.