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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 IO BOARD HIGH TEMP: a CTX heat zone went past 1075°F

While the limit board keeps an independent eye on heat, the I/O board that drives the infrared panels checks every zone too.

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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 IO BOARD HIGH TEMP
actually means.

While the limit board keeps an independent eye on heat, the I/O board that drives the infrared panels checks every zone too. If any zone passes 1075°F for 5 seconds, the oven beeps and shows IO BOARD HIGH TEMP. As with the limit board, this is well past cooking and cleaning temperatures, so a panel that will not turn off is the concern.

Middleby Marshall commercial appliance display · also shown as IO BOARD HIGH TEMP

What to do when IO BOARD HIGH TEMP 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 CTX DZ26T, DZ33T and DZ55T infrared conveyor oven owner's operating and installation manual (Rev G)

CTX DZ26T, DZ33T and DZ55T infrared conveyor ovens with the touch screen (manual Rev G). The message shows only on the Manual Mode and Preset Mode main screens.

Before you book,
in this order.

Each step comes from Middleby Marshall's own guidance for IO BOARD HIGH TEMP on its commercial appliances. Follow it to the end: the last card says whether this is a visit.

01

Stop loading product and let the oven cool down.

02

Acknowledge the message and watch whether one zone climbs faster than the others after restart.

03

A repeat calls for a technician, who will look for a stuck heater relay or a panel control problem.

Still there?

It usually turns into reach-in and prep table repair. Book with the code and the model number.

What not to do

IO BOARD HIGH TEMP does not mean the I/O board itself is hot; it reports a zone temperature. Heat inside the electronics compartment is a different message, CONTROL COMPARTMENT HIGH TEMP.

What you may
notice with it.

The commercial appliance problems IO BOARD HIGH TEMP 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 IO BOARD HIGH TEMP 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 FAULTCONTROL COMPARTMENT HIGH TEMPHIGH TEMP CHECK FANSFAN 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 temperature in any zone has exceeded 1075°F (579°C) for more than 5 seconds.
Middleby Marshall CTX DZ26T, DZ33T and DZ55T infrared conveyor oven owner's operating and installation manual (Rev G) Middleby Marshall CTX DZ26T, DZ33T and DZ55T infrared conveyor oven owner's operating and installation manual (Rev G) Middleby Marshall CTX DZ26T, DZ33T and DZ55T infrared conveyor oven owner's operating and installation manual (Rev G)

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. CTX DZ26T, DZ33T and DZ55T infrared conveyor ovens with the touch screen (manual Rev G). The message shows only on the Manual Mode and Preset Mode main screens.

Middleby Marshall IO BOARD HIGH TEMP 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

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For the heart of your home.

Questions
about IO BOARD HIGH TEMP.

Can I clear IO BOARD HIGH TEMP myself?
Stop loading product and let the oven cool down. If it comes back, it needs a visit.
Why does my CTX show both IO BOARD HIGH TEMP and LIMIT BOARD HIGH TEMP?
Both boards watch for the same kind of overheating. Seeing both makes a real heating problem more likely than a sensor error.
Does IO BOARD HIGH TEMP on a CTX mean the board is overheating?
No. The name refers to the board that trips, and the reading comes from the oven zones.
Can food catch fire in a CTX that shows IO BOARD HIGH TEMP?
Temperatures that high can char product and grease. Clear the belt, let the oven cool and book a visit.

Back to your everyday

Still showing IO BOARD HIGH TEMP?

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