Middleby Marshall limit board probe message on the CTX: the safety board cannot read its sensor
The limit board relies on its own temperature sensor.
Mon–Sat, 8am–8pm
- Sensors and probes
- Commercial controls and board repair
- Source: Middleby Marshall
Book a visit
Three short steps, about a minute.
or call (844) 571-4566
Loading appointment form…
The appointment form couldn’t load. Please try again.
What LIMIT BOARD PROBE FAULT
actually means.
The limit board relies on its own temperature sensor. When the reading goes beyond what it can measure accurately for 5 seconds, the oven beeps and shows the limit board probe message. That can be genuine extreme heat, but a damaged sensor or connection is just as likely, and either way the safety watch is compromised.
Middleby Marshall commercial appliance display
What to do when LIMIT BOARD PROBE FAULT shows on the commercial applianceKind of codeSensors and probes
A probe is handing the controller a reading it cannot trust, or none at all: a box or coil sensor torn loose from its clip, a fryer probe coated in carbon from oil left too long between filterings, a combi core probe with a kinked cable, or a connector gone green from steam and cleaning chemicals. The unit then runs on, stops, or shuts the heat or the cooling off to protect itself. Letting it cool and restarting it as the manual describes is fair; a probe that still reads wrong sits behind a panel, and that is a visit.
Usually leads toCommercial controls and board repair
Controllers, touch panels, relays, contactors and interlocks tested, and replaced only when the evidence says so.
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 LIMIT BOARD PROBE FAULT on its commercial appliances. Follow it to the end: the last card says whether this is a visit.
Stop loading product and let the oven cool.
Acknowledge the message and check whether the zone temperatures on the screen look normal.
Stop using the oven if the message repeats; the limit board sensor has to be tested on site.
Still there?
It usually turns into commercial controls and board repair. Book with the code and the model number.
What not to do
This message is about the safety board losing a trustworthy reading, not the main zone probes that control cooking. A confirmed overheat on the same board shows as LIMIT BOARD HIGH TEMP instead.
What you may
notice with it.
The commercial appliance problems LIMIT BOARD PROBE FAULT tends to arrive with. Answer these at the commercial appliance before anyone is booked.
All problems
Where LIMIT BOARD PROBE FAULT usually leads
Commercial controls and board 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 repairMore Middleby Marshall codes
Sensors and probes on other makes
In Middleby Marshall's own words
The temperature at the limit board is too high to be accurately sensed for more than 5 seconds.
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 LIMIT BOARD PROBE 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.
All service areasTampa BayFL · 31 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
Questions
about LIMIT BOARD PROBE FAULT.
Can I clear LIMIT BOARD PROBE FAULT myself?
Is the CTX limit board probe the same as the zone probes?
Can I bake on a CTX while the limit board probe message is showing?
Why did the CTX limit board message appear right after installation?
Back to your everyday
Still showing LIMIT BOARD PROBE FAULT?
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.