--- title: "Middleby Marshall CONTROL OVERTEMP: the control compartment is too hot" description: "What CONTROL OVERTEMP means on Middleby Marshall CONTROL OVERTEMP: the control compartment is too hots, what to check before booking, and when it is not a…" url: "https://pizzaovenrepair.center/error-codes/middleby-marshall-control-overtemp/" --- # Middleby Marshall CONTROL OVERTEMP: the control compartment is too hot The PS638 lists CONTROL OVERTEMP beside CLEAN FILTERS and gives stopped cooling fans as its cause. ## What CONTROL OVERTEMP actually means. The PS638 lists CONTROL OVERTEMP beside CLEAN FILTERS and gives stopped cooling fans as its cause. The PS640 gas manual ties Control Over Temp to clogged front filters. Either way, the electronics are not getting enough cool air. Middleby Marshall pizza oven display · also shown as CONTROL OVERTEMP., Control Over Temp What to do when CONTROL OVERTEMP shows on the pizza oven ### Kind of code Blowers and airflow The air the oven bakes with is not moving as it should. In a conveyor or rapid-cook oven the impingement blower may be dragging on worn bearings, its fingers packed with grease so the jets fire unevenly, or its cooling fan clogged with flour dust until the controls overheat; a gas oven may also refuse to light when its combustion air switch never proves. Cleaning the intake filters and grilles with the oven off is safe; a blower that slows, squeals or smells hot is a visit. ### Usually leads to Pizza oven blower and fan repair Impingement blowers, cooling fans, bearings, belts and air fingers repaired or replaced, so hot air reaches every lane of the pizza oven evenly. ### 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 (74617) prints CONTROL OVERTEMP with stopped cooling fans as the cause; PS640 gas (60251 Rev J) prints Control Over Temp with clogged front filters. ## Before you book, in this order. Each step comes from Middleby Marshall's own guidance for CONTROL OVERTEMP on its pizza ovens. Follow it to the end: the last card says whether this is a visit. 01 Clean or replace the cooling fan filters first. 02 Clear anything stacked against the control side of the oven. 03 With the oven running, listen and feel for air at the cooling fan grilles; if there is none, book a visit to repair the fans. ### Still there? It usually turns into [pizza oven blower and fan repair](https://pizzaovenrepair.center/services/pizza-oven-blower-and-fan-repair/). Book with the code and the model number. ### What not to do CONTROL OVERTEMP is not a sign that the baking chamber is too hot. It is also not a burner or thermocouple message, so it does not explain uneven bakes on its own. ## What you may notice with it. The pizza oven problems CONTROL OVERTEMP 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 - [**Burning or Hot Wiring Smell From an Electric Pizza Oven**](https://pizzaovenrepair.center/problems/pizza-oven-burning-smell/) Problem ### Pizza Oven Error Code on a Deck, Conveyor or Rapid-Cook Display 7 causes, cheapest first Where CONTROL OVERTEMP usually leads ## Pizza oven blower and fan repair. **Impingement blower motor, bearings or wheel, cooling fan, filter or air fingers · moderate.** Book a visit [What the job involves](https://pizzaovenrepair.center/services/pizza-oven-blower-and-fan-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/) [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) Blowers and airflow on other makes [TurboChef F1](https://pizzaovenrepair.center/error-codes/turbochef-f1/) [All 3 codes of this kind](https://pizzaovenrepair.center/error-codes/#family-fan) 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 > Cooling Fans are not working [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 PS640 series gas oven owner's operating and installation manual (60251 Rev J)](https://www.middlebymarshall.com/wp-content/uploads/2022/08/PS640G-IO-Manual-60251-Rev-J_NEW-2025.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. PS638 (74617) prints CONTROL OVERTEMP with stopped cooling fans as the cause; PS640 gas (60251 Rev J) prints Control Over Temp with clogged front filters. ## Middleby Marshall CONTROL OVERTEMP 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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Clean or replace the cooling fan filters first. If it comes back, it needs a visit. ### Is CONTROL OVERTEMP worse than CLEAN FILTERS? It is the next step. CLEAN FILTERS warns that airflow is dropping; CONTROL OVERTEMP means the compartment has already overheated, and on the PS638 it points at the fans. ### Can a hot kitchen cause CONTROL OVERTEMP? It adds to the load on the cooling fans. The manuals list clogged filters and stopped fans as the causes to check first. ### Should I keep the oven running with CONTROL OVERTEMP? Only after the filters are clean and the fans are blowing. Running electronics hot shortens their life, so book a visit if the fans are still. --- **[Read on the site: Middleby Marshall CONTROL OVERTEMP: the control compartment is too hot](https://pizzaovenrepair.center/error-codes/middleby-marshall-control-overtemp/)** **[Book a visit with PizzaOvenRepair.center](https://pizzaovenrepair.center/schedule/)**