--- title: "Turbo Air d1: the D-sensor reads open or below -50 degrees" description: "What d1 means on Turbo Air d1: the D-sensor reads open or below -50 degreess, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/turbo-air-d1/" --- # Turbo Air d1: the D-sensor reads open or below -50 degrees d1 is the open-circuit reading of the D-sensor on the evaporator. ## What d1 actually means. d1 is the open-circuit reading of the D-sensor on the evaporator. A broken wire or loose connector gives the same result as a failed sensor. The board loses the reading it uses to judge whether the compressor is cooling the coil. Turbo Air commercial appliance display What to do when d1 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 Turbo Air Turbo Air cabinets in a busy kitchen tend to get a visit between shifts, with the manager present to sign off the log. ### Source Turbo Air PCB settings service sheet (control menu and error codes), turboairinc.com resource center Read from the error code item (ER) of the control menu, opened by holding both temperature buttons until SL shows, as laid out on Turbo Air's PCB settings sheet. ## Before you book, in this order. Each step comes from Turbo Air's own guidance for d1 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Probe the food and note the reading on your log. 02 Keep the doors closed and the load light until the sensor is fixed. 03 Book a visit and quote d1. ### 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 d1 is not a very cold evaporator; it is a lost signal. It is also not C1, which reports a coil that stays too warm. ## What you may notice with it. The commercial appliance problems d1 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 - [**Reach-In Cooler Not Holding Temperature Through a Shift**](https://commercialappliancerepair.center/problems/reach-in-not-holding-temperature/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where d1 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/) ## Turbo Air commercial appliances. Turbo Air cabinets in a busy kitchen tend to get a visit between shifts, with the manager present to sign off the log. [Turbo Air commercial appliance repair](https://commercialappliancerepair.center/brands/turbo-air/) More Turbo Air codes [F0](https://commercialappliancerepair.center/error-codes/turbo-air-f0/) [F1](https://commercialappliancerepair.center/error-codes/turbo-air-f1/) [r0](https://commercialappliancerepair.center/error-codes/turbo-air-r0/) [r1](https://commercialappliancerepair.center/error-codes/turbo-air-r1/) [d0](https://commercialappliancerepair.center/error-codes/turbo-air-d0/) [C1](https://commercialappliancerepair.center/error-codes/turbo-air-c1/) [F3](https://commercialappliancerepair.center/error-codes/turbo-air-f3/) [ED](https://commercialappliancerepair.center/error-codes/turbo-air-ed/) [S1](https://commercialappliancerepair.center/error-codes/turbo-air-s1/) Sensors and probes on other makes [Alto-Shaam E20](https://commercialappliancerepair.center/error-codes/alto-shaam-e20/) [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/) [All 57 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-sensor) Turbo Air 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. Turbo Air 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 Turbo Air's own words > D-sensor is open or box temp is below -50 degrees [Turbo Air PCB settings service sheet (control menu and error codes), turboairinc.com resource center](https://www.turboairinc.com/wp-content/uploads/2026/09/PCB-settings.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Read from the error code item (ER) of the control menu, opened by holding both temperature buttons until SL shows, as laid out on Turbo Air's PCB settings sheet. ## Turbo Air d1 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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Probe the food and note the reading on your log. If it comes back, it needs a visit. ### Why does my Turbo Air show d1? The D-sensor reads as open, from a failed sensor or a broken connection. ### Can I keep using a Turbo Air with d1? For a short time while you check the food yourself. Book a visit. ### Is d1 on a Turbo Air a board problem? Usually the sensor or its wiring. The board is checked too. --- **[Read on the site: Turbo Air d1: the D-sensor reads open or below -50 degrees](https://commercialappliancerepair.center/error-codes/turbo-air-d1/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**