Why does your fridge have a heater inside it?

Why does your fridge switch on a heater a few times a day, right next to the coldest part of the freezer? It sounds backwards, but it's the reason you never have to chip ice out of your freezer. Here's how a fridge really works: why it moves heat rather than making cold, why frost is a problem, how the defrost heater, timer and limiter work, where the meltwater goes, and the second heater you can feel on the door edge. Chapters 0:00 Intro 0:35 A fridge doesn't make cold 2:04 The frost problem 2:56 The defrost heater 4:13 Where the meltwater goes 4:42 The heater you can feel 5:14 Is it wasteful? 5:43 What this means for you Sources Refrigerator (defrost cycle timing, defrost limiter, history, efficiency): https://en.wikipedia.org/wiki/Refrige... How refrigerators work (compressor, evaporator, frost, drain pan): https://academy.fredsappliance.com/re... Defrost water drain and evaporation pan (US Patent 6,053,003): https://patents.google.com/patent/US6... Adaptive defrost control (US Patent 6,837,060): https://patents.justia.com/patent/683... LG: why the front and sides of a fridge feel warm: https://www.lg.com/us/support/help-li... R-600a in domestic refrigeration (AGAS Australia): https://www.agas.com/au/products-and-... Typical R-600a charge sizes (appliance repair trade source): https://easybear-appliancerepair.com/... Frost on the back wall and defrost faults (trade source): https://easybear-appliancerepair.com/... Water under the crisper and blocked defrost drains (trade source): https://easybear-appliancerepair.com/... Which? on dusty condenser coils: https://www.which.co.uk/news/2021/03/... Narration uses an AI voice. Footage and images were made with AI; labels and animations are original. If your fridge has a fault, talk to a qualified technician. This video is general information only.