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A stainless sandwich prep table on a restaurant line, the prep table's lid raised over a row of covered food pans, a probe thermometer standing in one pan, nobody at the table.

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.

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Mon–Sat, 8am–8pm

  • Temperature and alarms
  • Reach-in and prep table repair
  • Source: Middleby Marshall

Book a visit

Three short steps, about a minute.

or call (844) 571-4566

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 codeTemperature 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 toReach-in and prep table repair

Reach-ins, pass-throughs, prep tables and blast chillers: gaskets, hinges, fans, thermostats, condensers and compressors.

Shows up asCommercial 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.

MakeMiddleby 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.

SourceMiddleby 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. 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

Before you call

Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display

All 8 causes, cheapest first

It also comes with

Close view of the dark touch control panel on the front of a stainless combi oven in a commercial kitchen, one abstract amber warning indicator glowing among unlit icons, the steam-fogged glass door blurred beside it. 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

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

More Middleby Marshall codes

IO_COMM_LOSTMC1_COMM_LOSTMC2_COMM_LOSTPROBE_TL_FAULTFAN_HIGH_CURRENTFAN LOW CURRENTMC1_HIGH_CURRENTLIMIT BOARD HIGH TEMPLIMIT BOARD PROBE FAULTIO BOARD HIGH TEMPCONTROL COMPARTMENT HIGH TEMPFAN FAULT
All 14 Middleby Marshall codes

Temperature and alarms on other makes

Alto-Shaam E13Beverage-Air HiBlodgett Cavity High Temp ErrorCleveland RESET lightContinental Refrigerator HIDelfield HiFrymaster E16Garland E04
All 68 codes of this kind
A working restaurant cooking line under a stainless ventilation hood, two stainless gas fryers with baskets hanging above the oil, a flat griddle and a combi oven with a glass door beside them, the equipment clearly the subject, a cook seen only from behind and shoulders down at the far end of the line, warm kitchen light, small blue flames visible under the griddle. 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) Middleby Marshall LongWave LW26 and LW33 infrared conveyor oven owner's manual (Rev F) Middleby Marshall LongWave LW26 and LW33 infrared conveyor oven owner's manual (Rev F)

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.

All service areas

Tampa BayFL · 31 areas

OrlandoFL · 30 areas

Miami / South FloridaFL · 47 areas

New York MetroNY · 75 areas

HoustonTX · 36 areas

ChicagoIL · 50 areas

Los AngelesCA · 95 areas

San DiegoCA · 31 areas

San Francisco Bay AreaCA · 74 areas

A restaurant team working a busy commercial kitchen line.
For the heart of your home.

Questions
about HIGH TEMP CHECK FANS.

Can I clear HIGH TEMP CHECK FANS myself?
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.

Back to your everyday

Still showing HIGH TEMP CHECK FANS?

A booking with a code goes further when it has the code as shown, the model and serial from the data plate, and a word on whether the unit still holds temperature, heats, rinses or spins. With those three, the office can match the likely part to your unit the same day.

Schedule a repair Call (844) 571-4566
(844) 571-4566 Schedule a repair