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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 HI: the air in the cabinet is above its high alarm limit

True builds its units around several control makes, and each prints the high temperature alarm its own way: HI on Carel, Hi on Danfoss, hi on LAE.

(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 HI
actually means.

True builds its units around several control makes, and each prints the high temperature alarm its own way: HI on Carel, Hi on Danfoss, hi on LAE. All three mean the same thing: the probe in the return air reads warmer than the alarm limit stored in the control. The message reports a result, not a cause.

True Residential commercial appliance display · also shown as Hi, hi

What to do when HI 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)

Listed as HI for Carel, Hi for Danfoss ERC and ETC, and hi for LAE controls in True's general control guide (rev. C, 2025), which covers reach-ins, prep tables, undercounters and merchandisers.

Before you book,
in this order.

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

01

Probe two or three items of food with a calibrated thermometer and write the readings and the time on your temperature log.

02

Check that every door and drawer is shut, that no pan or box is holding a door off its gasket, and that the air vents inside are not blocked by product.

03

If food has been above 41°F, move it to a unit that is holding and follow your health code on how long it sat warm.

04

If HI comes back after the cabinet has had time to recover with the doors closed, book a visit.

Still there?

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

What not to do

HI does not name a failed part; a door propped open during a delivery trips it as easily as a tired compressor. On True units with a Dixell control the same kind of warm alarm reads HA, which has its own entry.

What you may
notice with it.

The commercial appliance problems HI 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 HI 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

LOdOrdEFHAP1P2E01ConLEAuLiEoCEE
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

HI High temperature 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. Listed as HI for Carel, Hi for Danfoss ERC and ETC, and hi for LAE controls in True's general control guide (rev. C, 2025), which covers reach-ins, prep tables, undercounters and merchandisers.

True Residential HI 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 HI.

Can I clear HI myself?
Probe two or three items of food with a calibrated thermometer and write the readings and the time on your temperature log. If it comes back, it needs a visit.
How do I quiet the HI alarm on a True cabinet?
Several True displays have a key marked to enter or mute the audible alarm, and on Dixell controls any key silences it. Muting only stops the beeper, so keep logging temperatures until the display shows the cabinet temperature again.
Why does my True show HI right after a delivery?
A load of room-temperature product warms the air that passes the probe, and the control reports it. Keep the doors shut and watch the reading; a number that keeps climbing instead of falling points to the cooling side.
Is HI the same on every True unit?
The meaning is the same, but the letters and the alarm limit depend on which control your unit carries. The serial tag and the control's own label tell a technician which section of True's guide applies.

Back to your everyday

Still showing HI?

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