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The open door of a cold stainless combi oven in a commercial kitchen, its empty racks in view and a thin core temperature probe hanging on its holder inside the cavity, nobody at the combi oven.

Traulsen SN1: the cabinet sensor has failed

The cabinet sensor is what the R & A Series control uses to decide when to cool.

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Mon–Sat, 8am–8pm

  • Sensors and probes
  • Commercial controls and board repair
  • Source: Traulsen

Book a visit

Three short steps, about a minute.

or call (844) 571-4566

What SN1
actually means.

The cabinet sensor is what the R & A Series control uses to decide when to cool. When it fails, the control can no longer read the box properly, and Traulsen marks SN1 as a message that needs service.

Traulsen commercial appliance display

What to do when SN1 shows on the commercial appliance

Kind 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.

MakeTraulsen

A Traulsen cabinet that starts to drift gets its visit as soon as the food inside has a safe place to go.

SourceTraulsen All Series quick reference guide, owner's manual TR35924 rev. C (2015), linked from traulsen.com owner's manuals

Shown by the control on R & A Series cabinets, as listed in Traulsen's quick reference guide TR35924 (rev. C, 2015). Units built after July 2025 carry the Smart Control, which keeps alarms in a menu instead (see PFA).

Before you book,
in this order.

Each step comes from Traulsen's own guidance for SN1 on its commercial appliances. Follow it to the end: the last card says whether this is a visit.

01

Check the food with a separate thermometer and log the reading.

02

Move food that must stay at 41°F or below if the cabinet is warming.

03

Book a visit; Traulsen marks SN1 as needing service.

Still there?

It usually turns into commercial controls and board repair. Book with the code and the model number.

What not to do

SN1 is not the coil sensor (SN2) or the liquid line sensor (SN3). The cabinet may still run for a while, but the display and the alarms can no longer be trusted.

What you may
notice with it.

The commercial appliance problems SN1 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 SN1 usually leads

Commercial controls and board repair.

Controller, touch panel, probe or sensor, relay, contactor, power supply, door switch or interlock, tested before anything is changed · moderate.
Book a visit What the job involves

Traulsen
commercial appliances.

A Traulsen cabinet that starts to drift gets its visit as soon as the food inside has a safe place to go.

Traulsen commercial appliance repair

More Traulsen codes

ELE LOSDOR OPNCHICLOCLN FILSN2SN3DEF ERRRUN ERRPFA

Sensors and probes on other makes

Alto-Shaam E20Beverage-Air E01Blodgett Cavity Probe ErrorContinental Refrigerator E0Delfield E01Dexter TEMP SENSOR SHORTFrymaster E13Garland E21
All 60 codes of this kind
A row of three stainless steel reach-in cabinets with solid doors along the wall of a working restaurant kitchen, the reach-ins clearly the subject, one door open showing sheet pans of prepped vegetables on wire shelves, a walk-in cooler door with a clear strip curtain visible at the far end, a cook seen only from behind in a white jacket passing in the soft background, bright even kitchen light. Traulsen builds this

Commercial cold storage

Reach-in and pass-through cabinets, walk-in coolers and walk-in freezers, prep and sandwich tables, undercounter units and blast chillers that hold a kitchen's food at safe temperatures.

 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. Traulsen 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 Traulsen's own words

SN1: Indicates cabinet sensor has failed.*
Traulsen All Series quick reference guide, owner's manual TR35924 rev. C (2015), linked from traulsen.com owner's manuals Traulsen All Series quick reference guide, owner's manual TR35924 rev. C (2015), linked from traulsen.com owner's manuals

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Shown by the control on R & A Series cabinets, as listed in Traulsen's quick reference guide TR35924 (rev. C, 2015). Units built after July 2025 carry the Smart Control, which keeps alarms in a menu instead (see PFA).

Traulsen SN1 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 SN1.

Can I clear SN1 myself?
Check the food with a separate thermometer and log the reading. If it comes back, it needs a visit.
Can a Traulsen keep cooling with SN1 on the display?
It may run in a fallback mode, but you cannot rely on it. Check the food with your own thermometer until the sensor is replaced.
Is SN1 on a Traulsen a big repair?
Usually not: a sensor is a smaller job than a control or a compressor. The control is checked too before a part is ordered.
What is the difference between SN1, SN2 and SN3 on a Traulsen?
Each is a different sensor: SN1 reads the cabinet air, SN2 the coil and SN3 the liquid line.

Back to your everyday

Still showing SN1?

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.

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