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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.

Alto-Shaam E20: the single-point core probe is not reading

Many CTP recipes finish by core temperature using a probe pushed into the food.

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Mon–Sat, 8am–8pm

  • Sensors and probes
  • Commercial controls and board repair
  • Source: Alto-Shaam

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Three short steps, about a minute.

or call (844) 571-4566

What E20
actually means.

Many CTP recipes finish by core temperature using a probe pushed into the food. E20 is called out when that single-point probe is malfunctioning or unplugged. The manual starts with how the probe is inserted and connected before blaming the probe.

Alto-Shaam commercial appliance display

What to do when E20 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.

MakeAlto-Shaam

An Alto-Shaam call is usually booked for the hours between the last plate and the prep crew, so the cabinet can cool and the tech can open it without holding up service.

SourceAlto-Shaam Combitherm CT PROformance Series operator's manual, MN-35948 Rev 21 (10/21) (Wayback copy)

Combitherm CT PROformance (CTP) combi ovens, error code table in operator's manual MN-35948 Rev 21.

Before you book,
in this order.

Each step comes from Alto-Shaam's own guidance for E20 on its commercial appliances. Follow it to the end: the last card says whether this is a visit.

01

Seat the probe tip in the center of the largest piece, clear of bone and of the pan.

02

Unplug and replug the probe at the oven, and with power off clean the receptacle pins as the manual allows.

03

If E20 stays, cook by time, check with a handheld thermometer, and book a visit for a new probe.

Still there?

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

What not to do

E20 is the single-point probe; the multipoint probe reports as E22 and E26 to E29. The fixed cabinet probe is a different part, reported as E21.

What you may
notice with it.

The commercial appliance problems E20 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 E20 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

Alto-Shaam
commercial appliances.

An Alto-Shaam call is usually booked for the hours between the last plate and the prep crew, so the cabinet can cool and the tech can open it without holding up service.

Alto-Shaam commercial appliance repair

More Alto-Shaam codes

E01E02E03E13E21E34E36E57E89E92E100E105
All 15 Alto-Shaam codes

Sensors and probes on other makes

Beverage-Air E01Blodgett Cavity Probe ErrorContinental Refrigerator E0Delfield E01Dexter TEMP SENSOR SHORTFrymaster E13Garland E21Hatco E1
All 61 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. Alto-Shaam 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. Alto-Shaam 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 Alto-Shaam's own words

Core-temperature probe not inserted into food correctly.
Alto-Shaam Combitherm CT PROformance Series operator's manual, MN-35948 Rev 21 (10/21) (Wayback copy) Alto-Shaam Combitherm CT PROformance Series operator's manual, MN-35948 Rev 21 (10/21) (Wayback copy)

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Combitherm CT PROformance (CTP) combi ovens, error code table in operator's manual MN-35948 Rev 21.

Alto-Shaam E20 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 E20.

Can I clear E20 myself?
Seat the probe tip in the center of the largest piece, clear of bone and of the pan. If it comes back, it needs a visit.
Why does my Alto-Shaam show E20 as soon as I start a probe recipe?
The oven may not see the probe at all. Make sure the plug is fully seated and the probe is in the food before starting.
Can I clean the probe socket on an Alto-Shaam combi?
The manual allows cleaning the receptacle pins with sand paper where it applies. Only do that once the oven is switched off and cold.
Does E20 on an Alto-Shaam mean the food is unsafe?
It means the oven cannot confirm the core temperature. Check the food with your own thermometer before serving or holding it.

Back to your everyday

Still showing E20?

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