--- title: "Hoshizaki E02: the defrost sensor on the coil has failed" description: "What E02 means on Hoshizaki E02: the defrost sensor on the coil has faileds, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/hoshizaki-e02/" --- # Hoshizaki E02: the defrost sensor on the coil has failed Hoshizaki places a second thermistor at the evaporator so the control knows when defrost is finished. ## What E02 actually means. Hoshizaki places a second thermistor at the evaporator so the control knows when defrost is finished. When that sensor fails, the display shows E02 and beeps on a one-minute cycle, while the compressor keeps cycling on the cabinet thermistor alone. Hoshizaki commercial appliance display What to do when E02 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 Hoshizaki On a Hoshizaki cold cabinet in a restaurant, the tech first finds out when the last good temperature was written on the log. ### Source Hoshizaki Steelheart Series upright A-Series service manual 73237 (archived copy of the Hoshizaki America PDF) Steelheart upright A-Series, Commercial Series upright S-Series, and Steelheart prep tables and refrigerated equipment stands. ## Before you book, in this order. Each step comes from Hoshizaki's own guidance for E02 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Silence the beep with the upper button. 02 Compare the cabinet reading on the display with a thermometer placed on a middle shelf. 03 Watch for frost on the evaporator cover and weaker airflow at the back of the cabinet over the next days. 04 Book a visit to have the defrost thermistor replaced before the coil builds ice. ### 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 E02 does not mean the cabinet is warm, and product is usually still safe when it first appears. It is also not the defrost cycle itself; a normal defrost shows the defrost icon without any code. ## What you may notice with it. The commercial appliance problems E02 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 E02 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/) ## Hoshizaki commercial appliances. On a Hoshizaki cold cabinet in a restaurant, the tech first finds out when the last good temperature was written on the log. [Hoshizaki commercial appliance repair](https://commercialappliancerepair.center/brands/hoshizaki/) More Hoshizaki codes [dor](https://commercialappliancerepair.center/error-codes/hoshizaki-dor/) [E01](https://commercialappliancerepair.center/error-codes/hoshizaki-e01/) [Hi](https://commercialappliancerepair.center/error-codes/hoshizaki-hi/) [Lo](https://commercialappliancerepair.center/error-codes/hoshizaki-lo/) [UHi](https://commercialappliancerepair.center/error-codes/hoshizaki-uhi/) [ULo](https://commercialappliancerepair.center/error-codes/hoshizaki-ulo/) [E1](https://commercialappliancerepair.center/error-codes/hoshizaki-e1/) [E3](https://commercialappliancerepair.center/error-codes/hoshizaki-e3/) [E7](https://commercialappliancerepair.center/error-codes/hoshizaki-e7/) 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 61 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-sensor) Hoshizaki 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. ## In Hoshizaki's own words > Defrost thermistor has failed. [Hoshizaki Steelheart Series upright A-Series service manual 73237 (archived copy of the Hoshizaki America PDF)](http://web.archive.org/web/20260311050402/https://secure.hoshizakiamerica.com/docs/manuals/Steelheart_UR_serv.pdf) [Hoshizaki Steelheart Series upright A-Series service manual 73237 (archived copy of the Hoshizaki America PDF)](http://web.archive.org/web/20260311050402/https://secure.hoshizakiamerica.com/docs/manuals/Steelheart_UR_serv.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Steelheart upright A-Series, Commercial Series upright S-Series, and Steelheart prep tables and refrigerated equipment stands. ## Hoshizaki E02 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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Silence the beep with the upper button. If it comes back, it needs a visit. ### Does E02 stop the compressor on a Hoshizaki? No. Hoshizaki's table says the cabinet keeps cycling on its cabinet thermistor, so cooling continues. Only the end of defrost has lost its sensor. ### Will a Hoshizaki cabinet ice up while E02 is showing? It can, given time, because defrost no longer ends on a coil reading. Weaker airflow and frost on the evaporator cover are the signs to book the repair sooner. ### How is E02 repaired on a Hoshizaki? A technician checks the defrost thermistor's reading and replaces it if it is open or shorted. The part is small, but it sits behind the evaporator cover, so it is a service visit rather than a staff task. --- **[Read on the site: Hoshizaki E02: the defrost sensor on the coil has failed](https://commercialappliancerepair.center/error-codes/hoshizaki-e02/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**