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A gray electrical disconnect box on a tiled commercial kitchen wall beside a stainless convection oven, the oven's heavy power cord running up to it, the disconnect handle set to off, nobody near it.

Alto-Shaam E02: the relay board inside the combi is too hot

The CTP's control electronics are cooled by a small fan that draws in room air.

(844) 571-4566

Mon–Sat, 8am–8pm

  • Controls and power
  • Commercial controls and board repair
  • Source: Alto-Shaam

Book a visit

Three short steps, about a minute.

or call (844) 571-4566

What E02
actually means.

The CTP's control electronics are cooled by a small fan that draws in room air. E02 is called out once the relay board temperature goes above 176°F. The manual lists a failed cooling fan or a blocked intake as the causes.

Alto-Shaam commercial appliance display

What to do when E02 shows on the commercial appliance

Kind of codeControls and power

The controller itself is reporting trouble, or the supply behind it is: a display with dead segments, a keypad that stopped responding after steam or degreaser got behind it, relays that stick, stored recipes or cycles that vanished overnight, a blown control fuse, or one leg of a three-phase feed missing so half the heat or the pump is gone. A full power cycle at the breaker, done as the manual describes, clears a passing glitch; a code that returns, a scorched smell or any sign of moisture behind the panel means the breaker stays off, 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 E02 on its commercial appliances. Follow it to the end: the last card says whether this is a visit.

01

Acknowledge the code with Start and switch the oven off so the electronics can cool.

02

Clear boxes, towels or pans stacked against the oven's sides and make sure nearby fryers or broilers are not venting onto it.

03

Book a visit if E02 comes back, since the cooling fan may have stopped.

Still there?

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

What not to do

E02 is the high stage of a two-step warning; E108 is the earlier one, called out between 140°F and 176°F. Neither code is about food or cabinet temperature.

What you may
notice with it.

The commercial appliance problems E02 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 E02 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

E01E03E13E20E21E34E36E57E89E92E100E105
All 15 Alto-Shaam codes

Controls and power on other makes

Beverage-Air uLiBlodgett Com ErrorDelfield uLiDexter F1Frymaster E19Garland E01Hatco Communication ErrorHenny Penny E-4
All 63 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

Relay board temperature is higher than 176°F (80°C).
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 E02 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 E02.

Can I clear E02 myself?
Acknowledge the code with Start and switch the oven off so the electronics can cool. If it comes back, it needs a visit.
What is the difference between E02 and E108 on an Alto-Shaam?
Both warn that the control board is hot. E108 appears first, between 140°F and 176°F; E02 is the higher step above 176°F.
Why does my Alto-Shaam CTP throw E02 in summer?
A hot kitchen leaves the cooling fan less margin, and anything blocking the intake makes it worse. If the fan cannot be heard running, it needs a technician.
Can I keep using an Alto-Shaam combi with E02?
Let it cool and try again once. A second E02 means the oven should sit idle until a technician sees it, because heat damages the boards.

Back to your everyday

Still showing E02?

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