Richard W Washington , IL September 30, 2014 Appliance: General Electric Refrigerator TFX24RGB Ge Refrigerator Tfx24rgb: Ge refrigerator was not cooling as normal. How to replace Refrigerator Defrost Timer. This unit has a recurring problem with the defrost timer. after the first 10 years the original part gave up. we had it replaced and (as normal for me i watched very closely) . after 2 years the same trouble started again. the defrost cycle would run to long. so i replaced the same part and solved the trouble again. so now about every 2 years this part wears out again and i order it and replace it. this has gone on for 20 years now and this unit is still going strong after serving us for 29 years with the continued replacement of this one part. 14 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes