--- title: "Sub-Zero refrigerator showing 20 2 00" description: "What 20 2 00 means on Sub-Zero refrigerators, what to check before booking, and when it is not a failure at all." url: "https://refrigeratorrepair.center/error-codes/sub-zero-20-2-00/" --- # Sub-Zero refrigerator showing 20 2 00 The control board reads the freezer defrost heater circuit as open. ## What 20 2 00 actually means. The control board reads the freezer defrost heater circuit as open. Sub-Zero gives the cause as the defrost bi-metal being stuck open. That is a part in the defrost circuit, so the freezer's defrost cycle is what is affected. Sub-Zero refrigerator display What to do when 20 2 00 shows on the refrigerator ### Kind of code Defrost The defrost cycle did not finish in the time the board allows. A heater, its thermostat or the sensor that ends the cycle. ### Usually leads to Defrost system repair The failure behind most slow, gradual losses of cooling — and behind most visible frost. ### Shows up as Frost Building Up in the Refrigerator Ice on the back wall, around the door, or over the whole freezer — and each location means something different. ### Make Sub-Zero Built-in and column refrigeration with dual sealed systems, serviced from the front and worth repairing far up the cost curve. ### Source Sub-Zero support: Classic Built In Series Error Code 20 2 00 Classic Series (BI). ## Before you book, in this order. Each step comes from Sub-Zero's own guidance for 20 2 00 on its refrigerators. Follow it to the end: the last card says whether this is a visit. 01 Turn off the breaker for 30 seconds, then turn it back on. 02 Check whether the code comes back once the unit is running again. 03 If it does, book a service visit and give them the full three-part code. ### Still there? It usually turns into [defrost system repair](https://refrigeratorrepair.center/services/defrost-system-repair/). Book with the code and the model number. ### What not to do It does not mean the compressor or the sealed system has failed. The problem is in the defrost circuit. ## What you may notice with it. The refrigerator problems 20 2 00 tends to arrive with. Answer these at the refrigerator before anyone is booked. [All problems](https://refrigeratorrepair.center/problems/) Before you call ### [Frost Building Up in the Refrigerator](https://refrigeratorrepair.center/problems/frost-buildup/) [All 4 causes, cheapest first](https://refrigeratorrepair.center/problems/frost-buildup/) It also comes with - [**Fresh Food Section Warm, Freezer Cold**](https://refrigeratorrepair.center/problems/fresh-food-warm-freezer-cold/) Problem ### Frost Building Up in the Refrigerator 4 causes, cheapest first Where 20 2 00 usually leads ## Defrost system repair. **Defrost heater, thermostat or sensor · low.** Book a visit [What the job involves](https://refrigeratorrepair.center/services/defrost-system-repair/) ## Read these before the visit. Short guides that make the call quicker and the diagnosis cheaper. [All guides](https://refrigeratorrepair.center/guides/) How not to need us ### Keeping the defrost drain clear before it floods Why it is doing that ### Why refrigerators stop cooling, in order of likelihood Error codes ### All 247 codes, by make ## Sub-Zero refrigerators. Built-in and column refrigeration with dual sealed systems, serviced from the front and worth repairing far up the cost curve. [Sub-Zero refrigerator repair](https://refrigeratorrepair.center/brands/sub-zero/) More Sub-Zero codes [Service](https://refrigeratorrepair.center/error-codes/sub-zero-service-light/) [Vacuum Condenser](https://refrigeratorrepair.center/error-codes/sub-zero-vacuum-condenser/) [EC40](https://refrigeratorrepair.center/error-codes/sub-zero-ec40/) [EC50](https://refrigeratorrepair.center/error-codes/sub-zero-ec50/) [EC30](https://refrigeratorrepair.center/error-codes/sub-zero-ec30/) [H2 LO](https://refrigeratorrepair.center/error-codes/sub-zero-h2-lo/) [L0 C](https://refrigeratorrepair.center/error-codes/sub-zero-l0-c/) [10 R 00](https://refrigeratorrepair.center/error-codes/sub-zero-10-r-00/) [35 R 33](https://refrigeratorrepair.center/error-codes/sub-zero-35-r-33/) Defrost on other makes [LG dH](https://refrigeratorrepair.center/error-codes/lg-dh/) [GE dE](https://refrigeratorrepair.center/error-codes/ge-de/) [Café dE](https://refrigeratorrepair.center/error-codes/cafe-de/) [Monogram dE](https://refrigeratorrepair.center/error-codes/monogram-de/) [Kenmore F dH](https://refrigeratorrepair.center/error-codes/kenmore-dh/) [GE Profile dE](https://refrigeratorrepair.center/error-codes/ge-profile-de/) [All 11 codes of this kind](https://refrigeratorrepair.center/error-codes/#family-defrost) Sub-Zero builds this ### Built-in refrigerator Flush with the cabinets, serviced from the front, and almost always repaired rather than replaced. Sub-Zero builds this ### Refrigerator column Separate refrigerator and freezer towers, each with its own sealed system — so a failure stays on one side. Sub-Zero builds this ### Side-by-side refrigerator Full-height freezer beside full-height fresh food, with the ice maker and dispenser built into the freezer door. ## In Sub-Zero's own words > Freezer defrost heater open Cause: Defrost bi-metal stuck open [Sub-Zero support: Classic Built In Series Error Code 20 2 00](https://www.subzero-wolf.com/assistance/answers/sub-zero/classic/built-in-series-error-code-20-2-00) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Classic Series (BI). ## Sub-Zero 20 2 00 refrigerator repair, where we come out. The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered. 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Turn off the breaker for 30 seconds, then turn it back on. If it comes back, it needs a visit. ### Is Sub-Zero 20 2 00 a compressor problem? No, it concerns the freezer defrost heater circuit, which the board reads as open. Sub-Zero traces it to a defrost bi-metal stuck open. The compressor and sealed system are not what this code names. ### What happens if I ignore 20 2 00 on my Sub-Zero? The code points at the freezer's defrost cycle, so defrost is the function at stake. Try the 30-second breaker reset once and see whether the code returns. If it does, book service and give the full three-part code. --- **[Read on the site: Sub-Zero refrigerator showing 20 2 00](https://refrigeratorrepair.center/error-codes/sub-zero-20-2-00/)** **[Book a visit with RefrigeratorRepair.center](https://refrigeratorrepair.center/schedule/)**