--- title: "Alto-Shaam E21: the cabinet temperature probe has failed" description: "What E21 means on Alto-Shaam E21: the cabinet temperature probe has faileds, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/alto-shaam-e21/" --- # Alto-Shaam E21: the cabinet temperature probe has failed The N6 probe tells the CTP how hot the cooking cabinet is. ## What E21 actually means. The N6 probe tells the CTP how hot the cooking cabinet is. E21 is called out when that probe is malfunctioning or disconnected. Without it the CTP has no idea how hot its cabinet is. Alto-Shaam commercial appliance display What to do when E21 shows on the commercial appliance ### Kind of code Sensors and probes A probe is handing the controller a reading it cannot trust, or none at all: a box or coil sensor torn loose from its clip, a fryer probe coated in carbon from oil left too long between filterings, a combi core probe with a kinked cable, or a connector gone green from steam and cleaning chemicals. The unit then runs on, stops, or shuts the heat or the cooling off to protect itself. Letting it cool and restarting it as the manual describes is fair; a probe that still reads wrong sits behind a panel, and that is a visit. ### Usually leads to Commercial controls and board repair Controllers, touch panels, relays, contactors and interlocks tested, and replaced only when the evidence says so. ### Shows up as Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display A commercial appliance error code appears as letters or numbers on a combi, fryer, reach-in controller, dish machine or laundry machine display, or as a flashing light or an alarm tone. ### Make Alto-Shaam An Alto-Shaam call is usually booked for the hours between the last plate and the prep crew, so the cabinet can cool and the tech can open it without holding up service. ### Source Alto-Shaam Combitherm CT PROformance Series operator's manual, MN-35948 Rev 21 (10/21) (Wayback copy) Combitherm CT PROformance (CTP) combi ovens, error code table in operator's manual MN-35948 Rev 21. ## Before you book, in this order. Each step comes from Alto-Shaam's own guidance for E21 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Acknowledge E21 with Start and take the food out. 02 Finish the batch in another oven. 03 Book a visit; the probe and its wiring sit behind panels that stay closed for anyone but a technician. ### Still there? It usually turns into [commercial controls and board repair](https://commercialappliancerepair.center/services/commercial-controls-and-board-repair/). Book with the code and the model number. ### What not to do E21 is not the food probe, which reports as E20 or E22. When the same probe shorts to ground instead of opening, the oven reports E43. ## What you may notice with it. The commercial appliance problems E21 tends to arrive with. Answer these at the commercial appliance before anyone is booked. [All problems](https://commercialappliancerepair.center/problems/) Before you call ### [Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display](https://commercialappliancerepair.center/problems/commercial-error-code/) [All 8 causes, cheapest first](https://commercialappliancerepair.center/problems/commercial-error-code/) It also comes with - [**Commercial Convection Oven Baking Unevenly Across the Racks**](https://commercialappliancerepair.center/problems/commercial-oven-uneven-bake/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where E21 usually leads ## Commercial controls and board repair. **Controller, touch panel, probe or sensor, relay, contactor, power supply, door switch or interlock, tested before anything is changed · moderate.** Book a visit [What the job involves](https://commercialappliancerepair.center/services/commercial-controls-and-board-repair/) ## Alto-Shaam commercial appliances. An Alto-Shaam call is usually booked for the hours between the last plate and the prep crew, so the cabinet can cool and the tech can open it without holding up service. [Alto-Shaam commercial appliance repair](https://commercialappliancerepair.center/brands/alto-shaam/) More Alto-Shaam codes [E01](https://commercialappliancerepair.center/error-codes/alto-shaam-e01/) [E02](https://commercialappliancerepair.center/error-codes/alto-shaam-e02/) [E03](https://commercialappliancerepair.center/error-codes/alto-shaam-e03/) [E13](https://commercialappliancerepair.center/error-codes/alto-shaam-e13/) [E20](https://commercialappliancerepair.center/error-codes/alto-shaam-e20/) [E34](https://commercialappliancerepair.center/error-codes/alto-shaam-e34/) [E36](https://commercialappliancerepair.center/error-codes/alto-shaam-e36/) [E57](https://commercialappliancerepair.center/error-codes/alto-shaam-e57/) [E89](https://commercialappliancerepair.center/error-codes/alto-shaam-e89/) [E92](https://commercialappliancerepair.center/error-codes/alto-shaam-e92/) [E100](https://commercialappliancerepair.center/error-codes/alto-shaam-e100/) [E105](https://commercialappliancerepair.center/error-codes/alto-shaam-e105/) [All 15 Alto-Shaam codes](https://commercialappliancerepair.center/error-codes/#codes-alto-shaam) Sensors and probes on other makes [Beverage-Air E01](https://commercialappliancerepair.center/error-codes/beverage-air-e01/) [Blodgett Cavity Probe Error](https://commercialappliancerepair.center/error-codes/blodgett-cavity-probe-error/) [Continental Refrigerator E0](https://commercialappliancerepair.center/error-codes/continental-refrigerator-e0/) [Delfield E01](https://commercialappliancerepair.center/error-codes/delfield-e01/) [Dexter TEMP SENSOR SHORT](https://commercialappliancerepair.center/error-codes/dexter-temp-sensor-short/) [Frymaster E13](https://commercialappliancerepair.center/error-codes/frymaster-e13/) [Garland E21](https://commercialappliancerepair.center/error-codes/garland-e21/) [Hatco E1](https://commercialappliancerepair.center/error-codes/hatco-e1/) [All 61 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-sensor) Alto-Shaam builds this ### Commercial cold storage Reach-in and pass-through cabinets, walk-in coolers and walk-in freezers, prep and sandwich tables, undercounter units and blast chillers that hold a kitchen's food at safe temperatures. Alto-Shaam builds this ### Commercial cooking equipment Fryers, griddles, charbroilers, restaurant ranges, convection and combi ovens, steamers, kettles, holding cabinets and toasters, on gas or electric, that make up the hot side of a kitchen line. ## In Alto-Shaam's own words > N6 oven cavity temperature probe wires disconnected. [Alto-Shaam Combitherm CT PROformance Series operator's manual, MN-35948 Rev 21 (10/21) (Wayback copy)](https://web.archive.org/web/20220509173647/https://www.alto-shaam.com/en/media-library/widen-assets/technical-literature/operators-manual/operators-manual_combitherm_ctp_mn-35948-en-18-pdf.pdf) [Alto-Shaam Combitherm CT PROformance Series operator's manual, MN-35948 Rev 21 (10/21) (Wayback copy)](https://web.archive.org/web/20220509173647/https://www.alto-shaam.com/en/media-library/widen-assets/technical-literature/operators-manual/operators-manual_combitherm_ctp_mn-35948-en-18-pdf.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Combitherm CT PROformance (CTP) combi ovens, error code table in operator's manual MN-35948 Rev 21. ## Alto-Shaam E21 commercial appliance 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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Acknowledge E21 with Start and take the food out. If it comes back, it needs a visit. ### Can I cook with E21 on an Alto-Shaam combi? It is not advisable, since the oven cannot measure its cabinet. Move the food and book a visit. ### What is N6 on an Alto-Shaam CTP? It is the name the manual gives the cavity temperature probe. You will see the same label in E11, E36 and E43. ### Is E21 different from E43 on an Alto-Shaam? Both involve the N6 probe. E21 reads it as open or disconnected, while E43 reads it as shorted to ground. --- **[Read on the site: Alto-Shaam E21: the cabinet temperature probe has failed](https://commercialappliancerepair.center/error-codes/alto-shaam-e21/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**