--- title: "Garland E21: a heat sink or board sensor reads wrong" description: "What E21 means on Garland E21: a heat sink or board sensor reads wrongs, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/garland-e21/" --- # Garland E21: a heat sink or board sensor reads wrong Garland's electronics carry their own temperature sensors. ## What E21 actually means. Garland's electronics carry their own temperature sensors. When one reports an error, or the board is overheated because the room is too hot, the unit switches off and shows E21, or eight short flashes after each long one. E24, E25 and E26 share this row. Garland commercial appliance display · also shown as 8 short flashes after each long flash 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 Garland Garland equipment on a cooking line is usually looked at after close, when every burner is cold and the grates can come up without rushing a cook. ### Source Garland Induction Counter-Top Series dual base-line models GI-SH/DU/BA installation, operation and maintenance manual, part number 4532290 Rev 3 Garland counter-top induction cook-tops, woks and griddles (GI-SH/DU/BA, GI-BH/BA, GI-SH/BA, GI-SH/GR). Units with a digital display show the E number; units with only an indicator lamp show the flash count instead. ## Before you book, in this order. Each step comes from Garland's own guidance for E21 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Switch off and let the unit cool. 02 Clear the vents and clean the air filter. 03 Reduce the air temperature around the unit if you can. 04 Book a visit if E21 appears in normal room conditions, since a board sensor may need replacement. ### 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 about the cook zone or the pan; that is E04. It concerns the electronics, and it often clears once the air around the unit is cooler. ## What you may notice with it. The commercial appliance problem 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/) 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/) ## Garland commercial appliances. Garland equipment on a cooking line is usually looked at after close, when every burner is cold and the grates can come up without rushing a cook. [Garland commercial appliance repair](https://commercialappliancerepair.center/brands/garland/) More Garland codes [E01](https://commercialappliancerepair.center/error-codes/garland-e01/) [E02](https://commercialappliancerepair.center/error-codes/garland-e02/) [E03](https://commercialappliancerepair.center/error-codes/garland-e03/) [E04](https://commercialappliancerepair.center/error-codes/garland-e04/) [E05](https://commercialappliancerepair.center/error-codes/garland-e05/) [E06](https://commercialappliancerepair.center/error-codes/garland-e06/) [E10](https://commercialappliancerepair.center/error-codes/garland-e10/) [E12](https://commercialappliancerepair.center/error-codes/garland-e12/) [E22](https://commercialappliancerepair.center/error-codes/garland-e22/) [E29](https://commercialappliancerepair.center/error-codes/garland-e29/) [E47](https://commercialappliancerepair.center/error-codes/garland-e47/) 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/) [Hatco E1](https://commercialappliancerepair.center/error-codes/hatco-e1/) [All 61 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-sensor) Garland 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 Garland's own words > Sensor error from heat sink or CPU. [Garland Induction Counter-Top Series dual base-line models GI-SH/DU/BA installation, operation and maintenance manual, part number 4532290 Rev 3](https://www.garland-group.com/asset?id=wilbv) [Garland Induction Counter-Top Series dual base-line models GI-SH/DU/BA installation, operation and maintenance manual, part number 4532290 Rev 3](https://www.garland-group.com/asset?id=wilbv) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Garland counter-top induction cook-tops, woks and griddles (GI-SH/DU/BA, GI-BH/BA, GI-SH/BA, GI-SH/GR). Units with a digital display show the E number; units with only an indicator lamp show the flash count instead. ## Garland 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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Switch off and let the unit cool. If it comes back, it needs a visit. ### Is E21 on a Garland a failed part? Sometimes. If the unit shows E21 in a cool room with clean filters, a sensor on the board is the likely cause. ### Why do E21 and E06 appear together on my Garland? Both point to heat around the electronics. A hot room or blocked intake can trigger either. ### Will E21 clear on its own? Often after the unit cools. If it returns right after a restart, book a visit. --- **[Read on the site: Garland E21: a heat sink or board sensor reads wrong](https://commercialappliancerepair.center/error-codes/garland-e21/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**