--- title: "Delfield E01: the air sensor is defective" description: "What E01 means on Delfield E01: the air sensor is defectives, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/delfield-e01/" --- # Delfield E01: the air sensor is defective Delfield's table names sensor 1 as the air sensor. ## What E01 actually means. Delfield's table names sensor 1 as the air sensor. It is the one the control relies on to decide when to cool, so with E01 showing the cabinet temperature is no longer properly controlled. Delfield commercial appliance display What to do when E01 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 Delfield For a Delfield station that runs warm by late lunch, we time the visit to a slow hour so the pans can come out and the rail can be tested empty. ### Source Delfield 6000XL and 6100XL Series reach-ins, installation, operation and maintenance manual, part 9294254 (archived copy of the delfield.com PDF) Listed in the operation and indication table of Delfield's R290 reach-in manual (6000XL/6100XL) and prep table manual (4400/4500 Series). ## Before you book, in this order. Each step comes from Delfield's own guidance for E01 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Check the food with a separate thermometer and log it. 02 Move food that must stay at 41°F or below if the cabinet drifts. 03 Book a visit and mention E01. ### 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 E01 is not a warm alarm, but a warm or overly cold cabinet may follow. E02 is the coil sensor, which affects defrost more than the cabinet temperature. ## What you may notice with it. The commercial appliance problems E01 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/) - [**Prep Table Running Warm in the Top Rail and the Base**](https://commercialappliancerepair.center/problems/prep-table-running-warm/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where E01 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/) ## Delfield commercial appliances. For a Delfield station that runs warm by late lunch, we time the visit to a slow hour so the pans can come out and the rail can be tested empty. [Delfield commercial appliance repair](https://commercialappliancerepair.center/brands/delfield/) More Delfield codes [Hi](https://commercialappliancerepair.center/error-codes/delfield-hi/) [Lo](https://commercialappliancerepair.center/error-codes/delfield-lo/) [dEF](https://commercialappliancerepair.center/error-codes/delfield-def/) [E02](https://commercialappliancerepair.center/error-codes/delfield-e02/) [LEA](https://commercialappliancerepair.center/error-codes/delfield-lea/) [uLi](https://commercialappliancerepair.center/error-codes/delfield-uli/) [uHi](https://commercialappliancerepair.center/error-codes/delfield-uhi/) [off](https://commercialappliancerepair.center/error-codes/delfield-off/) 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/) [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) Delfield 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. Delfield 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 Delfield's own words > Sensor 1 defect E01 X Air sensor [Delfield 6000XL and 6100XL Series reach-ins, installation, operation and maintenance manual, part 9294254 (archived copy of the delfield.com PDF)](https://web.archive.org/web/20260309094403/https://www.delfield.com/wp-content/uploads/2025/10/6000_IOM-Book_del_en_9294254.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Listed in the operation and indication table of Delfield's R290 reach-in manual (6000XL/6100XL) and prep table manual (4400/4500 Series). ## Delfield E01 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 the food with a separate thermometer and log it. If it comes back, it needs a visit. ### What does E01 mean on a Delfield prep table? The air sensor that the control uses to hold the cabinet has failed or lost its connection. ### Can I keep a Delfield running with E01? Only while you check the food with your own thermometer. Book a visit the same day. ### Is E01 on a Delfield a control problem? Usually it is the sensor or its wire. The control is checked too before any part is ordered. --- **[Read on the site: Delfield E01: the air sensor is defective](https://commercialappliancerepair.center/error-codes/delfield-e01/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**