--- title: "Middleby Marshall BAKING: the photo eye has seen product on the belt" description: "What BAKING means on Middleby Marshall BAKING: the photo eye has seen product on the belts, what to check before booking, and when it is not a failure at all." url: "https://pizzaovenrepair.center/error-codes/middleby-marshall-baking/" --- # Middleby Marshall BAKING: the photo eye has seen product on the belt The PS638 has a photo eye at the entrance to the baking chamber. ## What BAKING actually means. The PS638 has a photo eye at the entrance to the baking chamber. When product breaks the beam, the oven raises the blowers to baking speed and shows BAKING for a timed period long enough for the pizza to pass through, then drops back to idle. If BAKING never appears when product goes in, the photo eye is not working. Middleby Marshall pizza oven display What to do when BAKING shows on the pizza oven ### Kind of code Mode, not a failure No part of the oven has failed; the display is reporting a state someone chose or the oven entered on its own. A cool-down keeps the blowers turning after the heat is off until the cavity or the tunnel has dropped to a safe level, an energy save setting lets the decks sag between rushes, and a menu lock stops anyone on the line from changing the bake times. No part is needed: letting the cool-down run out, or the key sequence in the manual, brings the oven back. ### Usually leads to No repair If BAKING comes and goes with orders, leave it: that is the energy system working. ### 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 PS638 electric and gas oven owner's operating and installation manual (74617 Rev G) PS638 electric and gas ovens (74617 Rev G), which have the optional photocell. Other models use timed energy modes instead. ## Before you book, in this order. Each step comes from Middleby Marshall's own guidance for BAKING on its pizza ovens. Follow it to the end: the last card says whether this is a visit. 01 If BAKING comes and goes with orders, leave it: that is the energy system working. 02 If product goes in and BAKING does not appear, check that nothing is covering the photo eye at the loading end. 03 A manager can turn Energy Mode off so the oven bakes at full speed all the time, then book a visit to repair the photo eye. ### Cleared? The code has left the display, the decks or the tunnel come up to the set heat and hold it through a full service, the belt keeps its speed and the blowers run steady, all with no part changed. If the same code returns within a week, or on the next busy night, say so when you book. ### What not to do BAKING flickering on and off is not an electrical problem. Underdone pizzas with BAKING never showing point at the photo eye, not the burner. ## What you may notice with it. The pizza oven problems BAKING 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 No repair indicated ## Nothing to repair. No part of the oven has failed; the display is reporting a state someone chose or the oven entered on its own. A cool-down keeps the blowers turning after the heat is off until the cavity or the tunnel has dropped to a safe level, an energy save setting lets the decks sag between rushes, and a menu lock stops anyone on the line from changing the bake times. No part is needed: letting the cool-down run out, or the key sequence in the manual, brings the oven back. [How to read what your pizza oven is telling you](https://pizzaovenrepair.center/problems/pizza-oven-error-code/) ## 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/) [PROBE # OPEN](https://pizzaovenrepair.center/error-codes/middleby-marshall-probe-open/) [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/) [All 16 Middleby Marshall codes](https://pizzaovenrepair.center/error-codes/#codes-middleby-marshall) Mode, not a failure on other makes [Alfresco Igniter keeps glowing after the burner lights](https://pizzaovenrepair.center/error-codes/alfresco-igniter-glows-while-lit/) [Blodgett LOAD](https://pizzaovenrepair.center/error-codes/blodgett-load/) [Fontana Forni noP](https://pizzaovenrepair.center/error-codes/fontana-forni-nop/) [Marra Forni Day 1 of 5 (curing screen)](https://pizzaovenrepair.center/error-codes/marra-forni-day-of-5/) [TurboChef Oven Door Open](https://pizzaovenrepair.center/error-codes/turbochef-oven-door-open/) [Wood Stone LO](https://pizzaovenrepair.center/error-codes/wood-stone-lo/) [All 16 codes of this kind](https://pizzaovenrepair.center/error-codes/#family-mode) 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 > Oven is cycling normally. BAKING [Middleby Marshall PS638 electric and gas oven owner's operating and installation manual (74617 Rev G)](https://www.middlebymarshall.com/wp-content/uploads/2021/07/74617-PS638-Owners-Manual.pdf) [Middleby Marshall PS638 electric and gas oven owner's operating and installation manual (74617 Rev G)](https://www.middlebymarshall.com/wp-content/uploads/2021/07/74617-PS638-Owners-Manual.pdf) [Middleby Marshall PS638 electric and gas oven owner's operating and installation manual (74617 Rev G)](https://www.middlebymarshall.com/wp-content/uploads/2021/07/74617-PS638-Owners-Manual.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. PS638 electric and gas ovens (74617 Rev G), which have the optional photocell. Other models use timed energy modes instead. ## Middleby Marshall BAKING 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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If BAKING comes and goes with orders, leave it: that is the energy system working. ### Why does BAKING keep turning on and off on my Middleby Marshall PS638? Each time product breaks the photo eye beam, the oven speeds up its blowers and shows BAKING for a set time, then returns to idle. That is normal. ### My PS638 pizzas come out underdone and BAKING never shows. What is wrong? The manual points at the photo eye. Until it is repaired, a manager can turn Energy Mode off so the oven bakes at full blower speed. ### Where is the photo eye on a Middleby Marshall conveyor? At the entrance side of the baking chamber, where product first goes in. Keep it clear of flour and cardboard. --- **[Read on the site: Middleby Marshall BAKING: the photo eye has seen product on the belt](https://pizzaovenrepair.center/error-codes/middleby-marshall-baking/)** **[Book a visit with PizzaOvenRepair.center](https://pizzaovenrepair.center/schedule/)**