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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
Restaurant Equipment Repair

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.

(844) 571-4566

Mon–Sat, 8am–8pm

  • 1 commercial appliance types
  • 5 problems we see
  • 14 error codes

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Middleby Marshall commercial appliances,
specifically.

Middleby Marshall of Elgin, Illinois, makes conveyor ovens, and its infrared lines, the CTX DZ series and the LongWave LW26 and LW33, move sandwiches, proteins, sides and baked goods through heat zones on a timed belt. On this site we cover those infrared conveyors in kitchens that cook far more than pizza, where a message on the touch screen usually names the zone, belt or board involved.

The Middleby Marshall lineup

Builds1 commercial appliance type

Commercial cooking equipment

Called out forCommercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display

and 4 more problems on Middleby Marshall

Repairs we do10 repairs, on any make

Commercial appliance diagnostic visit · Walk-in cooler repair · Reach-in and prep table repair · Commercial fryer repair

Error codesIO_COMM_LOST · MC1_COMM_LOST · MC2_COMM_LOST · PROBE_TL_FAULT · FAN_HIGH_CURRENT

14 Middleby Marshall codes with a page of their own

The Middleby Marshall
lineup.

Middleby Marshall builds 1 of the 4 commercial appliance types this site covers. Which one decides how the visit is planned.

All commercial appliance types
Cooking equipment

Commercial cooking equipment

3 of the problems we see on Middleby Marshall come up on it Commercial cooking equipment repair

What is particular
to Middleby Marshall.

We work on CTX DZ26T, DZ33T and DZ55T and LongWave LW26 and LW33 infrared conveyors, stacked or single. PS-series and X-Series impingement conveyors belong to the pizza oven site.

Heat that travels as infrared

CTX and LongWave ovens use panels above and below the belt that give off long-wave infrared, which warms the food surface rather than the air. A zone that runs cold shows up as a pale stripe on the product, so we test each zone separately.

Belt speed is cook time

On a conveyor oven the minutes on the screen are how long the belt takes to carry food through. Motor controls MC1 and MC2 run the front and rear belts on two-lane CTX ovens and report their own messages.

Two independent heat watchdogs

Besides the main I/O board, the CTX has a limit board that can shut heat down on its own above 1075°F. When both boards complain, overheating is real rather than a sensor glitch.

A self-clean at 900°F

The DZ series runs a one-hour cleaning cycle at 900°F and then returns to its previous mode instead of switching off. Staff need to know that before they reach for the belt afterward.

Parts

Infrared panels, zone probes, motor controls, I/O and limit boards are ordered by the oven serial number, since these ovens are voltage specific. The magnetic fan filter is a routine part to keep on hand.

Repair or replace

Most infrared conveyor problems, such as a probe, a panel, a motor control or a fan, are worth repairing on a sound frame. A stack with several failed panels and a worn belt drive on an older oven is where a new oven may be the better spend.

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What we are
called out for.

On Middleby Marshall, most often commercial appliance error code on a combi, fryer, dish machine or laundry display.

All problems

Middleby Marshall error codes

All Middleby Marshall codes
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.

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

8 causes, cheapest first

 A stainless double-stack commercial convection oven with its top door open, a sheet pan of cookies pulled halfway out, browned dark at the back and pale toward the front, a second pan on the rack below.

Commercial Convection Oven Baking Unevenly Across the Racks

6 causes, cheapest first

 A thin wisp of gray smoke rising from the lower grille of a stainless reach-in cabinet standing beside a commercial fryer line, the reach-in doors closed, the kitchen lights on and the line empty. Gas, fire, food at risk or water near power

Restaurant Equipment Burning Smell: Scorched Oil, Hot Wiring or Lint

6 causes, cheapest first

 A bank of stainless commercial fryers under a steel exhaust hood, white wet chemical suppression agent coating the vats and the hood filters after a discharge, a thin haze of smoke drifting up into the hood, the frying station deserted. Gas, fire, food at risk or water near power

Commercial Fryer Fire or Grease Flare Under the Hood

6 causes, cheapest first

Not a
Middleby Marshall?

Middleby Marshall is one of 35 commercial appliance makes on this site. The other 34 each have a page of their own.

All 35 brands

Middleby Marshall commercial appliance repair,
where we come out.

9 metros, each with its own page.

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
Middleby Marshall commercial appliances.

Does Middleby Marshall make ovens for more than pizza?
Yes. Its infrared conveyors are sold for cooking, baking, searing and roasting in high-volume kitchens, and the CTX is used for sandwiches, proteins and sides.
How often should the fan filter on a CTX oven be cleaned?
Weekly, according to the manual: shake it out if dusty, or wash it with dish soap if greasy, and let it dry before reinstalling.
Why does my CTX oven stay hot after the clean cycle?
The cycle runs at 900°F for an hour and then returns to the last cooking mode rather than turning off. Switch the oven off yourself if you want it to cool.
Can I stack Middleby Marshall infrared ovens?
The manuals show single, double and triple stacks, and the DZ33T, DZ55T and LW33 can go four high with the right stand.

Back to your everyday

Book your Middleby Marshall visit.

Have the commercial appliance's model number ready — on Middleby Marshall it decides which parts come on the first visit.

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