--- title: "Turbo Air F1: the F-sensor reads open or below -50 degrees" description: "What F1 means on Turbo Air F1: the F-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-f1/" --- # Turbo Air F1: the F-sensor reads open or below -50 degrees F1 is the open-circuit twin of F0: the defrost sensor's reading has dropped off the bottom of the scale. ## What F1 actually means. F1 is the open-circuit twin of F0: the defrost sensor's reading has dropped off the bottom of the scale. A cut wire, an unplugged connector or a failed sensor all look the same to the board. Defrost then runs on time rather than coil temperature. Turbo Air commercial appliance display What to do when F1 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 F1 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Check whether anyone worked behind the evaporator cover or cleaned inside recently; a knocked plug gives F1. 02 Keep logging food temperatures while you wait. 03 Book a visit and quote F1. ### 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 F1 is not a sign the cabinet is too cold; no Turbo Air box reaches -50 degrees. It is a wiring or sensor problem. ## What you may notice with it. The commercial appliance problems F1 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 - [**Walk-In Freezer Icing Up on the Coil, Floor and Door Frame**](https://commercialappliancerepair.center/problems/walk-in-freezer-icing-up/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where F1 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/) [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/) [d1](https://commercialappliancerepair.center/error-codes/turbo-air-d1/) [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 > F-sensor is stuck open or box 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 F1 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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Check whether anyone worked behind the evaporator cover or cleaned inside recently; a knocked plug gives F1. If it comes back, it needs a visit. ### Why does my Turbo Air show F1? The board reads the F-sensor as open. A loose plug or a damaged wire is as likely as a dead sensor. ### Is F1 on a Turbo Air urgent? Not at once, but the coil can ice up over time without proper defrost control. ### How is the F-sensor tested on a Turbo Air? The technician checks the connector and measures the sensor, then compares the reading with the actual coil temperature. --- **[Read on the site: Turbo Air F1: the F-sensor reads open or below -50 degrees](https://commercialappliancerepair.center/error-codes/turbo-air-f1/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**