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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.

True dOr: a door has been open longer than the control allows

Each control make True uses has its own spelling of the door alarm: dOr on Carel, dor on Danfoss ERC, do on LAE and dA on Dixell.

(844) 571-4566

Mon–Sat, 8am–8pm

  • Temperature and alarms
  • Reach-in and prep table repair
  • Source: True Residential

Book a visit

Three short steps, about a minute.

or call (844) 571-4566

What dOr
actually means.

Each control make True uses has its own spelling of the door alarm: dOr on Carel, dor on Danfoss ERC, do on LAE and dA on Dixell. The door switch tells the control the door is open, and after a set delay the control raises the alarm. It clears when the switch reads the door closed again.

True Residential commercial appliance display · also shown as dor, do, dA

What to do when dOr 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.

MakeTrue Residential

A True cooler or prep station in a restaurant is looked at once the kitchen confirms where the held food is sitting for now.

SourceTrue Commercial Refrigeration General Control Guide, P#811072, rev. C (09/2025)

dOr (Carel), dor (Danfoss ERC), do (LAE) and dA (Dixell, door switch alarm) are all listed in True's general control guide (rev. C, 2025).

Before you book,
in this order.

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

01

Close every door firmly and listen for the alarm to stop.

02

Look for a sheet pan, a lid or a case of product holding the door a finger's width open.

03

Check the door gasket for a torn or folded section and wipe it clean.

04

If the message stays with the door shut tight, book a visit so the door switch and its wiring can be tested.

Still there?

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

What not to do

The door alarm is not a temperature alarm, though a door left open long enough will bring one. A self-closing door that drifts open usually needs the hinge or cam looked at, not the control.

What you may
notice with it.

The commercial appliance problems dOr 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 dOr 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

True Residential
commercial appliances.

A True cooler or prep station in a restaurant is looked at once the kitchen confirms where the held food is sitting for now.

True Residential commercial appliance repair

More True Residential codes

HILOdEFHAP1P2E01ConLEAuLiEoCEE
All 14 True Residential codes

Temperature and alarms on other makes

Alto-Shaam E13Beverage-Air HiBlodgett Cavity High Temp ErrorCleveland RESET lightContinental Refrigerator HIDelfield HiFrymaster E16Garland E04
All 69 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. True Residential 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. True Residential 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 True Residential's own words

dOr Open door alarm
True Commercial Refrigeration General Control Guide, P#811072, rev. C (09/2025) True Commercial Refrigeration General Control Guide, P#811072, rev. C (09/2025) True Commercial Refrigeration General Control Guide, P#811072, rev. C (09/2025)

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. dOr (Carel), dor (Danfoss ERC), do (LAE) and dA (Dixell, door switch alarm) are all listed in True's general control guide (rev. C, 2025).

True Residential dOr 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 dOr.

Can I clear dOr myself?
Close every door firmly and listen for the alarm to stop. If it comes back, it needs a visit.
Why does my True show the door alarm when the door is closed?
The switch still reads the door as open. A door that has sagged, a bent switch actuator or a loose switch wire can all do that, and each needs a check with the door opened and closed.
After how many minutes does the True door alarm go off?
The delay is a setting in the control and differs by model and control make. If your staff trip it often during loading, a technician can tell you what it is set to.
Does the door alarm on a True mean the food is warm?
Not by itself. Check the food with a thermometer after the door has been closed for a while, and log what you find.

Back to your everyday

Still showing dOr?

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