Explanation Of Red / Orange Glow In Refrigerators
In a no frost refrigerator, the defrost timer activates defrost heaters in the evaporator section (rear of freezer) which heat up and melt the frost off 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. On side by side models, you may even be able to see an orange glow at the bottom of the freezer. This is normal.
To view a short video on normal refrigerator sounds