Patrick C Philadelphia , PA September 10, 2015 Appliance: Frigidaire Refrigerator FRT15B3AW5 Frigidaire Refrigerator Frt15b3aw5: The fridge was not getting cold. How to replace Refrigerator Defrost Timer. I replaced the defrost timer, which took about 10 minutes. After replacing the timer, I cleared out some ice that filled up the air passage from the freezer to the fridge (which allows the cold air to pass through from the freezer to the fridge). I went to sleep and the next morning the fridge was ice cold!!! Such a relief that I was able to spend a few bucks instead of hundreds for a new fridge. The parts took about 1 day to arrive, which was great. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes