Explanation Of Red or Orange Glow In Refrigerators
In a frost-free (no-frost) refrigerator, the defrost system activates defrost heaters in the evaporator section (rear of freezer) that heat up and melt frost off of the evaporator coils. This process lasts for approximately 25-45 minutes and usually happens up to twice a day.
During this time, there will be no running sounds, no fan noise, and you may hear water dripping or sizzling as it hits the heaters. You may even be able to see an orange glow at the bottom of the freezer. This is normal.