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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.

Alto-Shaam E109: the high-limit safety switch has opened

The high-limit switch is a safety device that cuts heating if the oven gets too hot.

(844) 571-4566

Mon–Sat, 8am–8pm

  • Temperature and alarms
  • Reach-in and prep table repair
  • Source: Alto-Shaam

Book a visit

Three short steps, about a minute.

or call (844) 571-4566

What E109
actually means.

The high-limit switch is a safety device that cuts heating if the oven gets too hot. E109 is called out when its input to the control board is open. The manual lists an overheat, a failed cooling fan, a stuck heat relay, or wiring and switch trouble.

Alto-Shaam commercial appliance display

What to do when E109 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.

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 E109 on its commercial appliances. Follow it to the end: the last card says whether this is a visit.

01

Let the oven cool fully with the door closed.

02

Press the high-limit reset switch once, as the manual instructs, and no more.

03

If E109 remains, book a visit; the cause of the overheat has to be found.

Still there?

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

What not to do

E109 is not the relay board overheating, which is E02 or E108. It is also not a probe failure; the switch works independently of the temperature probes.

What you may
notice with it.

The commercial appliance problems E109 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 E109 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

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

E01E02E03E13E20E21E34E36E57E89E92E100
All 15 Alto-Shaam codes

Temperature and alarms on other makes

Beverage-Air HiBlodgett Cavity High Temp ErrorCleveland RESET lightContinental Refrigerator HIDelfield HiFrymaster E16Garland E04Hatco Control Board Overtemp
All 70 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

Press the high-limit reset switch only once.
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 E109 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 E109.

Can I clear E109 myself?
Let the oven cool fully with the door closed. If it comes back, it needs a visit.
How many times can I reset E109 on an Alto-Shaam?
Once. The manual says to press the high-limit reset switch only once and contact service if the condition remains.
What trips the high limit on an Alto-Shaam combi?
An overheat, often from a failed cooling fan or a heat relay stuck closed. A technician finds which it was.
Is E109 on an Alto-Shaam dangerous?
The switch has already cut the heat. Should smoke or a burning odor appear, shut the oven down and leave its cabinet closed.

Back to your everyday

Still showing E109?

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