--- title: "Wood Stone open: the hearth thermocouple circuit is broken" description: "What open means on Wood Stone open: the hearth thermocouple circuit is brokens, what to check before booking, and when it is not a failure at all." url: "https://pizzaovenrepair.center/error-codes/wood-stone-open/" --- # Wood Stone open: the hearth thermocouple circuit is broken Wood Stone reads the hearth temperature from a thermocouple buried under the floor. ## What open actually means. Wood Stone reads the hearth temperature from a thermocouple buried under the floor. When the wire from that sensor is unplugged, loose or broken, the controller has no reading and shows open instead of a number. Wood Stone pizza oven display · also shown as OPEN What to do when 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 Wood Stone Where a Wood Stone oven faces the dining room, the tech plans the visit around guests who can watch the hearth from their tables. ### Source Wood Stone Mountain Series and Traditional Series service manual (M0014.10) Type 2 and Type 4 controllers on Mountain Series, Traditional Series and Fire Deck ovens, and the Bistro Line and Phoenix controllers, where the manual prints it in capitals as OPEN. ## Before you book, in this order. Each step comes from Wood Stone's own guidance for open on its pizza ovens. Follow it to the end: the last card says whether this is a visit. 01 Turn the oven off at the controller and let it cool before anything else. 02 On a Bistro or Phoenix oven, look at the thermocouple plug on the control box: if it has worked out of its socket, push it back in fully with the power off. 03 If the plug is seated and open stays, book a visit; the checks at the junction box under the oven and the continuity test are technician work. ### 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 open does not report a failed burner or a gas problem; the flames may be fine. It is also different from LO, which is only a cold floor reading. ## What you may notice with it. The pizza oven problems 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 - [**Deck Oven Temperature Drifting Away From the Dial Setting**](https://pizzaovenrepair.center/problems/deck-oven-temperature-drifting/) - [**Pizza Oven Not Getting Hot Enough to Bake a Crisp Crust**](https://pizzaovenrepair.center/problems/pizza-oven-not-getting-hot/) Problem ### Pizza Oven Error Code on a Deck, Conveyor or Rapid-Cook Display 7 causes, cheapest first Where 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/) ## Wood Stone pizza ovens. Where a Wood Stone oven faces the dining room, the tech plans the visit around guests who can watch the hearth from their tables. [Wood Stone pizza oven repair](https://pizzaovenrepair.center/brands/wood-stone/) More Wood Stone codes [chec](https://pizzaovenrepair.center/error-codes/wood-stone-chec/) [PROB](https://pizzaovenrepair.center/error-codes/wood-stone-prob/) [FAIL](https://pizzaovenrepair.center/error-codes/wood-stone-fail/) [EEE](https://pizzaovenrepair.center/error-codes/wood-stone-eee/) [LO](https://pizzaovenrepair.center/error-codes/wood-stone-lo/) [System Error!](https://pizzaovenrepair.center/error-codes/wood-stone-system-error/) [RADIANT BURNER FAILED](https://pizzaovenrepair.center/error-codes/wood-stone-radiant-burner-failed/) [Red over-temperature light](https://pizzaovenrepair.center/error-codes/wood-stone-red-over-temperature-light/) [All indicator lights flashing](https://pizzaovenrepair.center/error-codes/wood-stone-all-indicator-lights-flashing/) [ECONOMY light](https://pizzaovenrepair.center/error-codes/wood-stone-economy-light/) [Cook buttons flashing red](https://pizzaovenrepair.center/error-codes/wood-stone-cook-buttons-flashing-red/) 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/) [Middleby Marshall PROBE # OPEN](https://pizzaovenrepair.center/error-codes/middleby-marshall-probe-open/) [TurboChef F2](https://pizzaovenrepair.center/error-codes/turbochef-f2/) [All 11 codes of this kind](https://pizzaovenrepair.center/error-codes/#family-temperature) Wood Stone builds this ### Outdoor gas pizza oven A stainless pizza oven on a counter, a cart or set into masonry, fired by propane or natural gas under a stone floor and a low insulated dome. Wood Stone builds this ### Wood-fired pizza oven A refractory dome over a firebrick or cast hearth, fired with wood and often a gas burner too, with a chimney, a door and thick insulation around it. Wood Stone builds this ### Commercial deck oven A pizzeria's stacked steel oven with stone decks, heated by gas burners or electric elements, each deck with its own door, thermostat and controls. ## In Wood Stone's own words > Temperature display reads “open” [Wood Stone Mountain Series and Traditional Series service manual (M0014.10)](https://woodstone-corp.com/wp-content/uploads/2022/10/M0014_MS_Service_Manual_10.pdf) [Wood Stone Mountain Series and Traditional Series service manual (M0014.10)](https://woodstone-corp.com/wp-content/uploads/2022/10/M0014_MS_Service_Manual_10.pdf) [Wood Stone Bistro Line and Phoenix service manual (M0008.09)](https://woodstone-corp.com/wp-content/uploads/2026/04/M0008.09_BistroLINE-Phoenix_Service_Manual.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Type 2 and Type 4 controllers on Mountain Series, Traditional Series and Fire Deck ovens, and the Bistro Line and Phoenix controllers, where the manual prints it in capitals as OPEN. ## Wood Stone 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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Turn the oven off at the controller and let it cool before anything else. If it comes back, it needs a visit. ### What does open mean on a Wood Stone oven display? The controller cannot read its hearth thermocouple. The sensor, its plug or its wire is disconnected or broken somewhere between the floor and the controller. ### Can I keep baking on a Wood Stone oven that shows open? Without a floor reading the controller cannot hold a hearth set point, so the floor heat is no longer regulated. Stop, let it cool and have the sensor circuit checked. ### Why did open appear after the oven was moved or cleaned underneath? A thermocouple plug that was knocked or pulled is the most common reason. Wood Stone lists a loose connection before a failed sensor. --- **[Read on the site: Wood Stone open: the hearth thermocouple circuit is broken](https://pizzaovenrepair.center/error-codes/wood-stone-open/)** **[Book a visit with PizzaOvenRepair.center](https://pizzaovenrepair.center/schedule/)**