--- title: "Middleby Marshall PROBE # OPEN: one temperature probe has stopped reading" description: "What PROBE # OPEN means on Middleby Marshall PROBE # OPEN: one temperature probe has stopped readings, what to check before booking, and when it is not a…" url: "https://pizzaovenrepair.center/error-codes/middleby-marshall-probe-open/" --- # Middleby Marshall PROBE # OPEN: one temperature probe has stopped reading X-Series conveyors read the chamber with more than one temperature probe. ## What PROBE # OPEN actually means. X-Series conveyors read the chamber with more than one temperature probe. When one of them opens, the display shows PROBE followed by its number and OPEN, and an alarm sounds. The control makes up for the lost probe with the remaining ones, so the oven can carry on while service is arranged. Middleby Marshall pizza oven display What to do when PROBE # OPEN shows on the pizza oven ### Kind of code Temperature and sensors A probe is handing the controller a reading it cannot believe, or none at all: a deck or tunnel sensor coated in baked-on flour and grease, its lead chafed or scorched where it passes the heat, or a connector loosened by years of doors slamming. The oven then runs hot, stalls short of its setting or shuts the heat off to protect itself. Letting the oven cool and restarting it is reasonable; a sensor that still reads wrong sits behind a panel, and that is a visit. ### Usually leads to Pizza oven thermostat and control repair Thermostats calibrated or replaced, probes, timers, boards and displays repaired, so the pizza oven holds the temperature the cooks set and shows the right number. ### Shows up as Pizza Oven Error Code on a Deck, Conveyor or Rapid-Cook Display A pizza oven error code shows as letters or numbers on the display of a conveyor, deck or rapid-cook oven, a flashing light on its panel, or a message about ignition, heat, belt or airflow. ### Make Middleby Marshall A Middleby Marshall conveyor call is about the line: how many pies came out right before the belt slowed, stalled or the crust went pale. ### Source Middleby Marshall X70G, X55G, X55GWB gas oven owner's operating and installation manual (78866 Rev F) X70G, X55G and X55GWB gas conveyors (78866 Rev F). The number in the message is the probe position; the manual prints it as PROBE # OPEN. ## Before you book, in this order. Each step comes from Middleby Marshall's own guidance for PROBE # OPEN on its pizza ovens. Follow it to the end: the last card says whether this is a visit. 01 Press Dismiss and carry on with service; the control compensates for the missing probe. 02 Write down the probe number on the screen. 03 Watch the bake more closely than usual, and book a visit to replace the probe before a second one fails. ### Still there? It usually turns into [pizza oven thermostat and control repair](https://pizzaovenrepair.center/services/pizza-oven-thermostat-and-control-repair/). Book with the code and the model number. ### What not to do One open probe is a warning, not a shutdown. If every probe is lost, the message changes to ALL PROBES OPEN and the oven needs immediate repair. ## What you may notice with it. The pizza oven problems PROBE # OPEN tends to arrive with. Answer these at the pizza oven before anyone is booked. [All problems](https://pizzaovenrepair.center/problems/) Before you call ### [Pizza Oven Error Code on a Deck, Conveyor or Rapid-Cook Display](https://pizzaovenrepair.center/problems/pizza-oven-error-code/) [All 7 causes, cheapest first](https://pizzaovenrepair.center/problems/pizza-oven-error-code/) It also comes with - [**Conveyor Oven Uneven Bake Across the Belt or From End to End**](https://pizzaovenrepair.center/problems/conveyor-oven-uneven-bake/) Problem ### Pizza Oven Error Code on a Deck, Conveyor or Rapid-Cook Display 7 causes, cheapest first Where PROBE # OPEN usually leads ## Pizza oven thermostat and control repair. **Thermostat calibrated or replaced, temperature probe, timer, controller board or display · moderate.** Book a visit [What the job involves](https://pizzaovenrepair.center/services/pizza-oven-thermostat-and-control-repair/) ## Middleby Marshall pizza ovens. A Middleby Marshall conveyor call is about the line: how many pies came out right before the belt slowed, stalled or the crust went pale. [Middleby Marshall pizza oven repair](https://pizzaovenrepair.center/brands/middleby-marshall/) More Middleby Marshall codes [RESET IGNITION](https://pizzaovenrepair.center/error-codes/middleby-marshall-reset-ignition/) [HEATING ERROR](https://pizzaovenrepair.center/error-codes/middleby-marshall-heating-error/) [HIGH TEMP ERROR](https://pizzaovenrepair.center/error-codes/middleby-marshall-high-temp-error/) [FRONT BELT JAMMED](https://pizzaovenrepair.center/error-codes/middleby-marshall-front-belt-jammed/) [REAR BELT JAMMED](https://pizzaovenrepair.center/error-codes/middleby-marshall-rear-belt-jammed/) [FRONT BELT COMM LOST](https://pizzaovenrepair.center/error-codes/middleby-marshall-front-belt-comm-lost/) [SENSOR OPEN](https://pizzaovenrepair.center/error-codes/middleby-marshall-sensor-open/) [MAIN BLOWER ERROR](https://pizzaovenrepair.center/error-codes/middleby-marshall-main-blower-error/) [Combustion Blower problem](https://pizzaovenrepair.center/error-codes/middleby-marshall-combustion-blower-problem/) [**00FF](https://pizzaovenrepair.center/error-codes/middleby-marshall-00ff/) [CLEAN FILTERS](https://pizzaovenrepair.center/error-codes/middleby-marshall-clean-filters/) [CONTROL OVERTEMP](https://pizzaovenrepair.center/error-codes/middleby-marshall-control-overtemp/) [All 16 Middleby Marshall codes](https://pizzaovenrepair.center/error-codes/#codes-middleby-marshall) Temperature and sensors on other makes [Fontana Forni Er1](https://pizzaovenrepair.center/error-codes/fontana-forni-er1/) [Marra Forni Open](https://pizzaovenrepair.center/error-codes/marra-forni-open/) [TurboChef F2](https://pizzaovenrepair.center/error-codes/turbochef-f2/) [Wood Stone open](https://pizzaovenrepair.center/error-codes/wood-stone-open/) [All 15 codes of this kind](https://pizzaovenrepair.center/error-codes/#family-temperature) Middleby Marshall builds this ### Conveyor and rapid-cook pizza oven A tunnel oven whose wire belt carries pizzas through hot air jets, and the countertop rapid-cook ovens that bake a pizza in minutes. ## In Middleby Marshall's own words > Temperature Probe number # is [Middleby Marshall X70G, X55G, X55GWB gas oven owner's operating and installation manual (78866 Rev F)](https://www.middlebymarshall.com/wp-content/uploads/2021/05/X55-X55GWB-X70-78866-Rev-F.pdf) [Middleby Marshall X70G, X55G, X55GWB gas oven owner's operating and installation manual (78866 Rev F)](https://www.middlebymarshall.com/wp-content/uploads/2021/05/X55-X55GWB-X70-78866-Rev-F.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. X70G, X55G and X55GWB gas conveyors (78866 Rev F). The number in the message is the probe position; the manual prints it as PROBE # OPEN. ## Middleby Marshall PROBE # OPEN pizza oven 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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Press Dismiss and carry on with service; the control compensates for the missing probe. If it comes back, it needs a visit. ### Can I keep using my Middleby Marshall with PROBE # OPEN? The manual says to dismiss it and resume, because the control compensates for the lost probe. Book the repair anyway, since the oven now has less to go on. ### What does the number in PROBE # OPEN mean? It identifies which thermocouple has failed. Giving that number when you book saves the technician time finding the right one. ### Why do my pizzas bake differently since PROBE # OPEN appeared? With one probe gone, the control is estimating that part of the chamber. A small shift in color from one side is possible until the probe is replaced. --- **[Read on the site: Middleby Marshall PROBE # OPEN: one temperature probe has stopped reading](https://pizzaovenrepair.center/error-codes/middleby-marshall-probe-open/)** **[Book a visit with PizzaOvenRepair.center](https://pizzaovenrepair.center/schedule/)**