--- title: "Middleby Marshall limit board probe message on the CTX: the safety board cannot read its sensor" description: "What LIMIT BOARD PROBE FAULT means on Middleby Marshall limit board probe message on the CTX: the safety board cannot read its sensors, what to check before…" url: "https://commercialappliancerepair.center/error-codes/middleby-marshall-limit-board-probe-error/" --- # Middleby Marshall limit board probe message on the CTX: the safety board cannot read its sensor The limit board relies on its own temperature sensor. ## What LIMIT BOARD PROBE FAULT actually means. The limit board relies on its own temperature sensor. When the reading goes beyond what it can measure accurately for 5 seconds, the oven beeps and shows the limit board probe message. That can be genuine extreme heat, but a damaged sensor or connection is just as likely, and either way the safety watch is compromised. Middleby Marshall commercial appliance display What to do when LIMIT BOARD PROBE FAULT 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 Middleby Marshall Middleby Marshall ovens on this site are the kitchen's non-pizza baking and roasting work; pizza service calls belong to our pizza oven site. ### Source Middleby Marshall CTX DZ26T, DZ33T and DZ55T infrared conveyor oven owner's operating and installation manual (Rev G) CTX DZ26T, DZ33T and DZ55T infrared conveyor ovens with the touch screen (manual Rev G). The message shows only on the Manual Mode and Preset Mode main screens. ## Before you book, in this order. Each step comes from Middleby Marshall's own guidance for LIMIT BOARD PROBE FAULT on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Stop loading product and let the oven cool. 02 Acknowledge the message and check whether the zone temperatures on the screen look normal. 03 Stop using the oven if the message repeats; the limit board sensor has to be tested on site. ### 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 This message is about the safety board losing a trustworthy reading, not the main zone probes that control cooking. A confirmed overheat on the same board shows as LIMIT BOARD HIGH TEMP instead. ## What you may notice with it. The commercial appliance problems LIMIT BOARD PROBE FAULT 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 - [**Restaurant Equipment Burning Smell: Scorched Oil, Hot Wiring or Lint**](https://commercialappliancerepair.center/problems/commercial-burning-smell/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where LIMIT BOARD PROBE FAULT 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/) ## Middleby Marshall commercial appliances. Middleby Marshall ovens on this site are the kitchen's non-pizza baking and roasting work; pizza service calls belong to our pizza oven site. [Middleby Marshall commercial appliance repair](https://commercialappliancerepair.center/brands/middleby-marshall/) More Middleby Marshall codes [IO_COMM_LOST](https://commercialappliancerepair.center/error-codes/middleby-marshall-io-comm-lost/) [MC1_COMM_LOST](https://commercialappliancerepair.center/error-codes/middleby-marshall-mc1-comm-lost/) [MC2_COMM_LOST](https://commercialappliancerepair.center/error-codes/middleby-marshall-mc2-comm-lost/) [PROBE_TL_FAULT](https://commercialappliancerepair.center/error-codes/middleby-marshall-probe-tl-error/) [FAN_HIGH_CURRENT](https://commercialappliancerepair.center/error-codes/middleby-marshall-fan-high-current/) [FAN LOW CURRENT](https://commercialappliancerepair.center/error-codes/middleby-marshall-fan-low-current/) [MC1_HIGH_CURRENT](https://commercialappliancerepair.center/error-codes/middleby-marshall-mc1-high-current/) [LIMIT BOARD HIGH TEMP](https://commercialappliancerepair.center/error-codes/middleby-marshall-limit-board-high-temp/) [IO BOARD HIGH TEMP](https://commercialappliancerepair.center/error-codes/middleby-marshall-io-board-high-temp/) [CONTROL COMPARTMENT HIGH TEMP](https://commercialappliancerepair.center/error-codes/middleby-marshall-control-compartment-high-temp/) [HIGH TEMP CHECK FANS](https://commercialappliancerepair.center/error-codes/middleby-marshall-high-temp-check-fans/) [FAN FAULT](https://commercialappliancerepair.center/error-codes/middleby-marshall-fan-error/) [All 14 Middleby Marshall codes](https://commercialappliancerepair.center/error-codes/#codes-middleby-marshall) 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) Middleby Marshall 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 Middleby Marshall's own words > The temperature at the limit board is too high to be accurately sensed for more than 5 seconds. [Middleby Marshall CTX DZ26T, DZ33T and DZ55T infrared conveyor oven owner's operating and installation manual (Rev G)](https://www.middlebymarshall.com/wp-content/uploads/2022/01/CTX-DZ26T-DZ33T-DZ55T-Series-Electric-Oven-Rev-G.pdf) [Middleby Marshall CTX DZ26T, DZ33T and DZ55T infrared conveyor oven owner's operating and installation manual (Rev G)](https://www.middlebymarshall.com/wp-content/uploads/2022/01/CTX-DZ26T-DZ33T-DZ55T-Series-Electric-Oven-Rev-G.pdf) [Middleby Marshall CTX DZ26T, DZ33T and DZ55T infrared conveyor oven owner's operating and installation manual (Rev G)](https://www.middlebymarshall.com/wp-content/uploads/2022/01/CTX-DZ26T-DZ33T-DZ55T-Series-Electric-Oven-Rev-G.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. CTX DZ26T, DZ33T and DZ55T infrared conveyor ovens with the touch screen (manual Rev G). The message shows only on the Manual Mode and Preset Mode main screens. ## Middleby Marshall LIMIT BOARD PROBE FAULT 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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Stop loading product and let the oven cool. If it comes back, it needs a visit. ### Is the CTX limit board probe the same as the zone probes? No. The zone probes feed the main control that manages cooking; the limit board has its own sensor for a separate safety check. ### Can I bake on a CTX while the limit board probe message is showing? Not safely. The oven's backup overheat protection cannot see properly, so hold off until it is tested. ### Why did the CTX limit board message appear right after installation? A connector disturbed during moving or stacking is a common reason. It still needs a technician to check it. --- **[Read on the site: Middleby Marshall limit board probe message on the CTX: the safety board cannot read its sensor](https://commercialappliancerepair.center/error-codes/middleby-marshall-limit-board-probe-error/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**