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The open lower door of a stainless commercial gas fryer on a restaurant cooking line, a blank riveted metal data plate with no readable marks inside the fryer door lit by a small flashlight held in a hand seen only to the wrist, the fryer's cooled oil vat and a hanging basket just visible above, nothing outdoors.

Troubleshooting

Where the data plate hides on restaurant equipment: fryer doors, cabinet corners and the screen

A commercial equipment data plate lists the model and serial number, the electrical supply, and the fuel on gas-fired units. Look in the upper right of a Traulsen reach-in, on the inside left wall of a Victory reach-in, inside the door of Frymaster, Pitco and Henny Penny fryers, on top of the door on a Hobart LXn, and in the settings screen of a Rational combi.

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  • Safe checks with the unit off
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  • Across every type and make

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At a
glance.

The commercial equipment data plate carries the model and serial number, the voltage and phase, and for gas equipment the fuel it was set up for, and no two makers put it in the same place. Finding it before the technician arrives saves a second trip for the wrong part.

Read the whole guide

What it listsModel, serial, volts, phase, gas

The figures a building's supply has to match.

FryersInside the fryer door

Frymaster, Pitco and Henny Penny all use the door.

Reach-insInside the cabinet, upper corner or side wall

Traulsen upper right; Victory on the inside of the left wall.

CombisOn the screen as well

Rational shows the serial number in its settings and error messages.

What the commercial equipment data plate tells a technician

The data plate is the unit's identity card. The model and serial number decide which parts fit, and the supply figures record what the unit was built to run on. Frymaster's gas fryers are to be connected through a regulator set to the manifold pressure marked on the rating plate, and a fryer stamped NAT, PRO or MFG is to be connected only to natural, propane or manufactured gas respectively.

On cold storage the plate usually adds the refrigerant and its charge. Victory tells installers to rely on the equipment data plate for amps, refrigerant and refrigerant charge as the most up-to-date values. Those lines mean little to the crew and a great deal to the technician deciding what to load into the van.

  • Model number and serial number
  • Voltage, phase and amps, or the circuit size
  • Gas type and manifold pressure on gas units
  • Refrigerant type and charge on cold storage
  • Listing and sanitation marks from the testing agencies

Copy every plate before you need it

Photograph every plate in the building on a quiet afternoon and keep the pictures in one shared folder, named by station. When a unit quits at six in the evening, nobody has to empty a reach-in or pull a fryer out from the line just to read a serial number.

Source: Victory — RS/RSA reach-in installation and operation manual — Data plate on the inside of the left wall with model and serial numbers; reference it for amps, refrigerant and charge; removing or altering it releases Victory from warranty obligations; Frymaster — OCF30 / FPGL30 gas fryer installation, operation and maintenance manual (8196687) — Data plate and wiring diagram inside the fryer door; connect through a regulator set to the rated manifold pressure; NAT, PRO and MFG fryers only to that gas

Reach-ins, prep tables and walk-in coolers

Traulsen places its serial tag in the upper right of the interior on its reach-in, pass-through, roll-in and roll-through refrigerators, freezers and dual-temperature models, and uses it to record the electrical and cooling data along with the model and serial. Victory's RS reach-ins carry the data plate on the inside of the left wall, with the agency marks beside the model and serial numbers. On undercounter units and prep tables, look inside each door and behind the front grille.

A walk-in cooler has more than one plate: usually one for the insulated box, near or inside the door frame, and one on each part of the cooling system, the condensing unit outside and the evaporator inside. The condensing unit's plate is the one parts depend on, and it often sits on a roof or in a locked mechanical room, which is why that one is left to the visit.

Leave the plate where it is

Victory's warranty terms say that removing or altering the serial or data plate releases the maker from its warranty obligations. Do not peel a plate off to clean behind it, paint over it, or stick inventory labels across it.

Source: Traulsen — R-Series owner's manual (owner's manuals page) — The serial tag, recording electrical and refrigeration data with model and serial, is in the upper right interior of reach-in, pass-thru, roll-in and roll-thru models; Victory — RS/RSA reach-in installation and operation manual — Data plate on the inside of the left wall with model and serial numbers; reference it for amps, refrigerant and charge; removing or altering it releases Victory from warranty obligations

Close on a small blank metal plate with no characters inside a reach-in cabinet door frame.
Close on a small blank metal plate with no characters inside a reach-in cabinet door frame.

Fryers, ovens and the rest of the cooking line

Fryers are the easiest. Frymaster, Pitco and Henny Penny all fix the data plate to the inside of the fryer door, and Frymaster adds a wiring diagram there too. Open the door with the fryer off or idling and read it with a flashlight; nobody should ever need to reach past the door toward the vat or the burners to find it.

Ovens vary more. Blodgett's Zephaire gas convection oven keeps its rating plate inside the control compartment, reached by pulling out the control panel, which is a task for the service visit rather than the crew. Rational's combis display the serial number in their settings and inside every error message, so a clear photo of the screen often does the job without opening anything.

When the plate is scorched or greasy

Heat and grease darken plates along the line. Wipe with a cleaner safe for stainless steel and a soft cloth, read at a low angle with a flashlight, and if the digits are gone, look for the serial on the purchase invoice, the maker's warranty registration or a label on the manual that shipped with the unit.

Source: Frymaster — OCF30 / FPGL30 gas fryer installation, operation and maintenance manual (8196687) — Data plate and wiring diagram inside the fryer door; connect through a regulator set to the rated manifold pressure; NAT, PRO and MFG fryers only to that gas; Pitco — SG series gas fryer installation and operation manual (L20-206) — The fuel type is stamped on the data plate attached to the inside of the door; Henny Penny — Pressure fryers 500, 561 and 600 operator manual (FM05-011) — Check the data plate on the inside of the fryer door for the correct power supply; Blodgett — Zephaire gas convection oven manual — The rating plate is attached inside the control compartment, reached by pulling out the control panel; Rational — iCombi Pro original instructions for use (US) — Serial number information is available in the settings and displayed in error messages

Dish machines and laundry equipment

Hobart puts the LXn data plate on top of the door, and tells the installer to confirm that the electrical supply matches it and to size the service from it before connecting. On larger door-type and conveyor machines the position changes from model to model, so read the installation pages of the manual before anyone goes looking behind a panel; the lower front panel on the LXn, for instance, hides the wiring diagram, not a place for the crew.

Laundry machines differ by model, and the manuals show it with a picture rather than words. UniMac opens its washer-extractor manual with a figure of the serial plate location and asks for the model and serial numbers whenever parts or technical help are requested. On card and coin machines the same details often appear in the control's diagnostic menu as well.

Source: Hobart — LXn / LXGn Series instructions manual (F41243) — The machine data plate is located on the top of the door; verify the electrical supply against it before installation; UniMac — washer-extractor control manual (F8552201) — Serial plate location shown in a figure; provide serial and model numbers when ordering parts or seeking technical help

What to send when you book

A plate photo only helps if it can be read. Stand square to it, fill the frame, and take a second shot with the flash off if the first one glares. Then add the few details a plate cannot tell anyone.

  • A sharp photo of the whole plate, every line readable
  • Where the unit sits on the line or in the room
  • Whether a gas unit is on a quick disconnect and flexible connector
  • The controller message and when it first appeared
  • The purchase date and the maker's warranty paperwork if it is still in term

Step
by step.

Four steps, in the order worth doing them.

01

Switch off or idle

Turn the unit off, or let a fryer or oven sit idle, before opening any door to look.

02

Open the obvious door

Check inside the fryer door, the cabinet walls, the top of a dish machine door or behind a front grille.

03

Check the screen

On a combi or any unit with a touch screen, look for the serial number in the settings or the service information.

04

Photograph and file

Take a readable photo and save it under the station name before closing the door.

A restaurant team working a busy commercial kitchen line.
For the heart of your home.

Questions
owners ask.

Is the model number enough without the serial?
Often not. Makers change parts within a model over the years, and the serial tells the technician which version is in front of them.
The plate is missing. Can the unit still be repaired?
Usually. The serial may be on the invoice, the warranty registration, the controller's settings or a second label inside. Victory notes that a removed plate affects its warranty, so mention it when booking.
Why does the technician ask for the gas type when the line is already gas?
Burners are fitted for one fuel, and natural gas and propane run through differently sized orifices at different pressures. The makers stamp the gas type on the plate, and a unit moved between buildings may no longer match its supply.
Where is the plate on a walk-in cooler?
There are several: one for the box and one for each cooling component. The condensing unit's plate is the one for parts, and reaching a roof unit is part of the visit.

The problems
behind it.

Each has a page of its own: what it usually means and the causes in the order worth checking.

All 17 problems
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

 Close view through the open lower door of a stainless commercial griddle, a small blue pilot flame barely visible at the tip of the pilot burner beside a copper thermocouple tube, grease-darkened steel around it. Problem

Pilot Won't Stay Lit on a Fryer, Griddle or Steamer on the Line

6 causes, cheapest first

 The heavy stainless door of a walk-in cooler standing wide open onto a commercial kitchen, a torn clear strip curtain hanging to one side, shelves inside with covered food pans and crates, a digital thermometer on the wall showing only a warm amber glow. Gas, fire, food at risk or water near power

Walk-In Cooler Warm Above 41°F With Food Inside

6 causes, cheapest first

When it needs
a technician.

The repairs on the right are where this guide ends when the checks do not settle it.

Commercial appliance diagnostic visit

One visit finding why a cooler, fryer, oven, dish machine or laundry machine stopped earning its keep.

Commercial controls and board repair

Controllers, touch panels, relays, contactors and interlocks tested, and replaced only when the evidence says so.

Walk-in cooler repair

Walk-in coolers and freezers back to temperature: evaporators, fans, defrost, drain heaters, condensing units and doors.

More in
troubleshooting.

The checks an owner or manager can make safely, from the breaker, the gas valve, the water supply and the drain to door gaskets, coils, strainers, lint screens and the data plate, and where to stop and book.

The whole section
Safe checks with the unit off

Commercial appliance checks a manager can run before the service call

Breakers and disconnects, the valve handle at each gas unit, fill and drain, grilles, strainers and screens, then the message on the controller. What to photograph, and where a manager's part ends.

 Safe checks with the unit off

What controller alarms on commercial equipment are asking for: keep going, clean or shut down

Prompts, warnings and stops on fryers, combis, dish machines, reach-ins and laundry controls. Which messages Rational lets you cook through, defrost readings that look warm, and alarms someone switched off.

 Guides

All 18 guides

Six sections, by what you are trying to find out.

Back to your everyday

Read it and still not sure?

Book with what you checked and the model number, and the technician starts where the guide stopped.

Schedule a repair Call (844) 571-4566
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