Hoshizaki UHi: supply voltage too high for the prep table
Steelheart prep tables with raised rails and the refrigerated equipment stands watch their own supply.
Mon–Sat, 8am–8pm
- Controls and power
- Commercial controls and board repair
- Source: Hoshizaki
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What UHi
actually means.
Steelheart prep tables with raised rails and the refrigerated equipment stands watch their own supply. At roughly 135 volts or more the display shows UHi and the compressor is de-energized. The safety resets itself once the voltage is back in range.
Hoshizaki commercial appliance display
What to do when UHi shows on the commercial applianceKind 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.
MakeHoshizaki
On a Hoshizaki cold cabinet in a restaurant, the tech first finds out when the last good temperature was written on the log.
SourceHoshizaki Steelheart prep table with raised rail and refrigerated equipment stand service manual (archived copy of the Hoshizaki America PDF)
Steelheart prep tables with raised rail and refrigerated equipment stands. Not listed for the upright reach-ins.
Before you book,
in this order.
Each step comes from Hoshizaki's own guidance for UHi on its commercial appliances. Follow it to the end: the last card says whether this is a visit.
Note whether lights or other equipment on the same circuit are acting unusually.
Keep the lids and drawers closed, and move rail pans to another cold unit if they warm above 41°F.
Have an electrician or the utility measure the voltage at the outlet.
Book a visit if UHi keeps appearing while the outlet measures normal.
Still there?
It usually turns into commercial controls and board repair. Book with the code and the model number.
What not to do
UHi is not a warm-cabinet alarm, although the rail warms if the compressor stays off for long. It is not Hi either, which reports temperature rather than voltage.
What you may
notice with it.
The commercial appliance problems UHi tends to arrive with. Answer these at the commercial appliance before anyone is booked.
All problems
Where UHi usually leads
Commercial controls and board repair.
Hoshizaki
commercial appliances.
On a Hoshizaki cold cabinet in a restaurant, the tech first finds out when the last good temperature was written on the log.
Hoshizaki commercial appliance repairMore Hoshizaki codes
Controls and power on other makes
In Hoshizaki's own words
High-Voltage Alarm (135VAC±5% or more)
Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Steelheart prep tables with raised rail and refrigerated equipment stands. Not listed for the upright reach-ins.
Hoshizaki UHi 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 areasTampa BayFL · 31 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
Questions
about UHi.
Can I clear UHi myself?
Is UHi a problem with my Hoshizaki prep table or the building?
Why does my Hoshizaki prep table show UHi late in the evening?
Does UHi clear on its own?
Back to your everyday
Still showing UHi?
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.