--- title: "Middleby Marshall LongWave cooling fan message with a red LED" description: "What FAN FAULT means on Middleby Marshall LongWave cooling fan message with a red LEDs, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/middleby-marshall-fan-error/" --- # Middleby Marshall LongWave cooling fan message with a red LED The LongWave monitors its cooling fan through a feedback signal. ## What FAN FAULT actually means. The LongWave monitors its cooling fan through a feedback signal. If the fan breaks or the feedback is lost, the screen names the fan and a red LED glows at the right-hand edge of the compartment. The oven keeps cooking unless the compartment then gets too hot, and the manual mentions a fan current calibration under the general settings. Middleby Marshall commercial appliance display What to do when FAN FAULT shows on the commercial appliance ### Kind of code Motors and drives Something that should turn is not turning, or not at the speed the controller expects. A washer-extractor's drive or its inverter may stop the spin when the load is out of balance or a bearing drags, a tumbler's belt may slip so the drum barely moves, a convection or combi fan may slow on worn bearings and bake unevenly, and a dish machine's wash pump may hum without spraying. Redistributing a load, confirming the door is latched and running the machine's own test cycle are fair; a drum, a belt or a motor is a visit, and nobody reaches into a drum that could still move. ### Usually leads to Commercial laundry machine repair Coin, card and on-premise laundry machines and tumblers: door locks, bearings, inverters, burners and payment hardware. ### 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 FAN FAULT on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Keep cooking only while you watch for a high temperature message, which the oven would show next. 02 Clean the cooling fan filter and make sure the fan intake and exhaust are clear. 03 If your manager login allows it, run the fan current calibration in general settings as the manual suggests. 04 Book a visit if the red LED and the message stay after calibration. ### Still there? It usually turns into [commercial laundry machine repair](https://commercialappliancerepair.center/services/commercial-laundry-machine-repair/). Book with the code and the model number. ### What not to do This message does not stop the oven by itself, unlike the heat and belt alarms. It is also not the HIGH TEMP CHECK FANS message, which reports the heat that a failed fan eventually causes. ## What you may notice with it. The commercial appliance problem FAN FAULT 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/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where FAN FAULT usually leads ## Commercial laundry machine repair. **Laundry machine door lock, belt, bearings and seal, drain valve, inverter or motor; tumbler igniter, flame sensor, gas valve coil or airflow switch · moderate.** Book a visit [What the job involves](https://commercialappliancerepair.center/services/commercial-laundry-machine-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/) [HIGH TEMP CHECK FANS](https://commercialappliancerepair.center/error-codes/middleby-marshall-high-temp-check-fans/) [All 14 Middleby Marshall codes](https://commercialappliancerepair.center/error-codes/#codes-middleby-marshall) Motors and drives on other makes [Alto-Shaam E03](https://commercialappliancerepair.center/error-codes/alto-shaam-e03/) [Blodgett Fan Error](https://commercialappliancerepair.center/error-codes/blodgett-fan-error/) [Dexter F9](https://commercialappliancerepair.center/error-codes/dexter-f9/) [Frymaster E25](https://commercialappliancerepair.center/error-codes/frymaster-e25/) [Garland E03](https://commercialappliancerepair.center/error-codes/garland-e03/) [Hatco Fan Is Stopped](https://commercialappliancerepair.center/error-codes/hatco-fan-is-stopped/) [Miele Professional F78](https://commercialappliancerepair.center/error-codes/miele-professional-f78/) [Rational Service 47.1](https://commercialappliancerepair.center/error-codes/rational-service-47-1/) [All 22 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-motor) 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 cooling fan is broken, or the feedback is broken. [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 FAN FAULT 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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Keep cooking only while you watch for a high temperature message, which the oven would show next. If it comes back, it needs a visit. ### Why does my LongWave keep baking with the red fan LED on? The manual lets it continue until the control compartment gets too hot. Use that time to clean the filter and arrange a visit. ### What is fan current calibration on a Middleby Marshall LongWave? A setting under general settings that teaches the control the normal current of the fan. It can clear a false alarm after a fan is replaced. ### Is the LongWave red LED the same as a heating problem? No. It concerns the electronics cooling fan only; cooking zones have their own messages. --- **[Read on the site: Middleby Marshall LongWave cooling fan message with a red LED](https://commercialappliancerepair.center/error-codes/middleby-marshall-fan-error/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**