I have a Frigidaire Model FRT18s6aws year model 06. It will thaw an d refreeze food and ice on and off. When it thaws it seems the fan is working fine and is triing to get cold and the next day everything is frozen again.

Hello Lynn, thank you for your post!
I understand that your Frigidaire refrigerator is not making ice and items inside of the freezer are thawing out. This could be an issue with your control panel or sealed system, is there anything being displaying on the front of your refrigerator? May I also have your model number? You can locate your serial tag (which lists your model number) on the right hand wall of the fresh food side. With that information I would be able to assist you further. -Matt

If the self defrosting circuit is not working properly the freezer will ice up and internal temps will go up and thaw food. U indicate that it refreezes so whst could be the problem is the timer that controls the frequency and timing of the defrost cycle.

Refreezing food is not dangerous, the danger is that food can spoil before it's refrozen or after it's thawed again before being cooked and eaten. Freezing food does not kill bacteria, so once thawed bacteria continues to multiple at the same exponential rate it was multiplying at before being frozen.
Refreezing also reduces quality because the already slightly damaged cells are being expanded with ice crystals again. This isn't a big deal for meats or baked foods but is huge for rice, pasta, fruits and veggies.
Try to figure out how long things have been thawing/thawed to help you make a safe decision. And never feed a pet food you wouldn't eat, they can get food poisoning too.

Try replacing defrost thermostat. It may be stuck in open position allowing heater to run for full length of defrost cycle.

HI.DO BASICS FIRST .CLEAN CONDENSER UNIT FIRST THOROUGHLY.INTERMITENT FAULT IS ALWAYS A BIT DIFFICULT TO DIAGNOSE.TRY IT IF OK U HAVE CRACKED IT BUT IF SAME THEN C WEATHER THE MOTOR AND CON/UNIT IS WARM WHEN DEFROSTING IF COLD IT COUD BE A LAZY DEFROST TIMER OR T/STAT THEN HEATER AND FAN.GOOD LUCK ALI

Refreezing
Once food is thawed in the refrigerator, it is safe to refreeze it without cooking, although there may be a loss of quality due to the moisture lost through thawing. After cooking raw foods which were previously frozen, it is safe to freeze the cooked foods. If previously cooked foods are thawed in the refrigerator, you may refreeze the unused portion. Freeze leftovers within 3-4 days. Do not refreeze any foods left outside the refrigerator longer than 2 hours; 1 hour in temperatures above 90 °F.

Is it safe to refreeze food that has thawed completely?
Once food is thawed in the refrigerator, it is safe to refreeze it without cooking, although there may be a loss of quality due to the moisture lost through defrosting. After cooking raw foods which were previously frozen, it is safe to freeze the cooked foods. And if previously cooked foods are thawed in the refrigerator, you may refreeze the unused portion.

If you purchase previously frozen meat, poultry or fish at a retail store, you can refreeze if it has been handled properly.
(Source: Freezing and Food Safety)

Charlie

I am no pro on these but it sounds like your defrost heating coils are coming on to often. You may want to check them. Aslo just for good measure>>>
Is your circulating fan working?
Sometimes they stick and need a shot of WD 40 and then work
it back and forth a little until it wants to take off again. Keep me informed
and PLEASE give a Thumbs Up for the effort. The Raz Shack

Either defrost timer or Refrigerator thermostat, both located in the ceiling of the refrigerator, can give you long enough off times to actually cause thawing and then refreezing. Feel the rear wall of the freezer, half way down to see if a layer of frost has formed on it. This can indicate a problem in the defrost system which has three components.

The only way to be sure which of the two components is the cause would be to catch it in the thawing phase (not running). Tapping hard on the refrigerator temperature control knob can make it come on if it is the source of your problem. Good Luck

Your defrost system may be out on this unit.