--- title: "Middleby Marshall HIGH TEMP CHECK FANS: the LongWave control compartment is overheating" description: "What HIGH TEMP CHECK FANS means on Middleby Marshall HIGH TEMP CHECK FANS: the LongWave control compartment is overheatings, what to check before booking, and…" url: "https://commercialappliancerepair.center/error-codes/middleby-marshall-high-temp-check-fans/" --- # Middleby Marshall HIGH TEMP CHECK FANS: the LongWave control compartment is overheating LongWave ovens share the zone-heated infrared layout of the CTX, with a 24-volt cooling fan drawing air through a filter to keep the electronics cool. ## What HIGH TEMP CHECK FANS actually means. LongWave ovens share the zone-heated infrared layout of the CTX, with a 24-volt cooling fan drawing air through a filter to keep the electronics cool. When that compartment gets too hot, the screen reads HIGH TEMP CHECK FANS or OVERTEMP CHECK FANS. The manual names the fan intake under the control door and the exhaust at the back as the places to check. Middleby Marshall commercial appliance display · also shown as HIGH TEMP CHECK FANS, OVERTEMP CHECK FANS What to do when HIGH TEMP CHECK FANS shows on the commercial appliance ### Kind of code Temperature and alarms The controller has seen a temperature outside the band it was set for and is saying so: a box above its alarm point, a fryer vat or an oven cavity that tripped its high-limit, or a dish machine rinse that never came up to heat. Often the cause sits outside the unit, such as a door left open during a delivery, a coil packed with grease, a kitchen far hotter than the maker allows or a booster fed cold water. Checking the door, the coil and the air around the unit is fair; move the product if a cold box stays above 41°F, and book the visit. ### Usually leads to Reach-in and prep table repair Reach-ins, pass-throughs, prep tables and blast chillers: gaskets, hinges, fans, thermostats, condensers and compressors. ### 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 LongWave LW26 and LW33 infrared conveyor oven owner's manual (Rev F) Middleby Marshall LongWave LW26 and LW33 infrared conveyor ovens (manual Rev F). ## Before you book, in this order. Each step comes from Middleby Marshall's own guidance for HIGH TEMP CHECK FANS on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Clean the cooling fan filter with the oven off. 02 Clear anything blocking the intake under the control door or the exhaust at the back of the oven. 03 Restart the oven and watch whether the message returns during a full shift. 04 Repeated warnings point to a failing fan that will cook the boards over time; arrange service. ### Still there? It usually turns into [reach-in and prep table repair](https://commercialappliancerepair.center/services/reach-in-and-prep-table-repair/). Book with the code and the model number. ### What not to do This message says nothing about the food zones running hot. A fan that has stopped reporting brings the separate fan message with a red LED instead. ## What you may notice with it. The commercial appliance problems HIGH TEMP CHECK FANS 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 HIGH TEMP CHECK FANS usually leads ## Reach-in and prep table repair. **Reach-in, pass-through or prep table gasket, hinge, fan motor, thermostat or controller, defrost heater, leak repair or compressor · moderate.** Book a visit [What the job involves](https://commercialappliancerepair.center/services/reach-in-and-prep-table-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/) [LIMIT BOARD PROBE FAULT](https://commercialappliancerepair.center/error-codes/middleby-marshall-limit-board-probe-error/) [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/) [FAN FAULT](https://commercialappliancerepair.center/error-codes/middleby-marshall-fan-error/) [All 14 Middleby Marshall codes](https://commercialappliancerepair.center/error-codes/#codes-middleby-marshall) Temperature and alarms on other makes [Alto-Shaam E13](https://commercialappliancerepair.center/error-codes/alto-shaam-e13/) [Beverage-Air Hi](https://commercialappliancerepair.center/error-codes/beverage-air-hi/) [Blodgett Cavity High Temp Error](https://commercialappliancerepair.center/error-codes/blodgett-cavity-high-temp-error/) [Cleveland RESET light](https://commercialappliancerepair.center/error-codes/cleveland-reset-light/) [Continental Refrigerator HI](https://commercialappliancerepair.center/error-codes/continental-refrigerator-hi/) [Delfield Hi](https://commercialappliancerepair.center/error-codes/delfield-hi/) [Frymaster E16](https://commercialappliancerepair.center/error-codes/frymaster-e16/) [Garland E04](https://commercialappliancerepair.center/error-codes/garland-e04/) [All 68 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-temperature) 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 control compartment temperature is too high due to a blocked or broken cooling fan. [Middleby Marshall LongWave LW26 and LW33 infrared conveyor oven owner's manual (Rev F)](https://www.middlebymarshall.com/wp-content/uploads/2025/04/Long-Wave-LW26-LW33-Rev-F.pdf) [Middleby Marshall LongWave LW26 and LW33 infrared conveyor oven owner's manual (Rev F)](https://www.middlebymarshall.com/wp-content/uploads/2025/04/Long-Wave-LW26-LW33-Rev-F.pdf) [Middleby Marshall LongWave LW26 and LW33 infrared conveyor oven owner's manual (Rev F)](https://www.middlebymarshall.com/wp-content/uploads/2025/04/Long-Wave-LW26-LW33-Rev-F.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Middleby Marshall LongWave LW26 and LW33 infrared conveyor ovens (manual Rev F). ## Middleby Marshall HIGH TEMP CHECK FANS 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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Clean the cooling fan filter with the oven off. If it comes back, it needs a visit. ### Where is the cooling fan intake on a Middleby Marshall LongWave? The manual places it underneath the control door, with the exhaust at the back of the oven. Both need open space. ### Why do I see OVERTEMP CHECK FANS instead of HIGH TEMP CHECK FANS on my LongWave? The manual lists both wordings for the same condition, so treat them the same way. ### Can I keep cooking on a LongWave with HIGH TEMP CHECK FANS? Clean the filter and clear the vents first. Continuing with hot electronics risks a board failure and a longer shutdown. --- **[Read on the site: Middleby Marshall HIGH TEMP CHECK FANS: the LongWave control compartment is overheating](https://commercialappliancerepair.center/error-codes/middleby-marshall-high-temp-check-fans/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**