--- title: "Delfield uHi: line voltage is above 140 volts" description: "What uHi means on Delfield uHi: line voltage is above 140 voltss, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/delfield-uhi/" --- # Delfield uHi: line voltage is above 140 volts The same controls that warn of low voltage also watch for voltage that is too high, above 140 volts. ## What uHi actually means. The same controls that warn of low voltage also watch for voltage that is too high, above 140 volts. High voltage stresses the compressor, fans and the control itself. It usually points to a wiring or supply issue in the building. Delfield commercial appliance display What to do when uHi shows on the commercial appliance ### Kind of code Controls 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 to Commercial controls and board repair Controllers, touch panels, relays, contactors and interlocks tested, and replaced only when the evidence says so. ### Shows up as Commercial 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. ### Make Delfield For a Delfield station that runs warm by late lunch, we time the visit to a slow hour so the pans can come out and the rail can be tested empty. ### Source Delfield 6000XL and 6100XL Series reach-ins, installation, operation and maintenance manual, part 9294254 (archived copy of the delfield.com PDF) Listed in the operation and indication table of Delfield's R290 reach-in manual (6000XL/6100XL) and prep table manual (4400/4500 Series). ## Before you book, in this order. Each step comes from Delfield's own guidance for uHi on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Do not keep resetting the unit; note when uHi appears. 02 Ask an electrician to measure the outlet and check the circuit wiring. 03 Book a visit if uHi remains once the supply is confirmed normal. ### Still there? It usually turns into [commercial controls and board repair](https://commercialappliancerepair.center/services/commercial-controls-and-board-repair/). Book with the code and the model number. ### What not to do uHi is not a temperature alarm and not a failed control. It is the opposite of uLi, which warns of voltage under 96 volts. ## 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](https://commercialappliancerepair.center/problems/) Before you call ### [Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display](https://commercialappliancerepair.center/problems/commercial-error-code/) [All 8 causes, cheapest first](https://commercialappliancerepair.center/problems/commercial-error-code/) It also comes with - [**Restaurant Equipment Burning Smell: Scorched Oil, Hot Wiring or Lint**](https://commercialappliancerepair.center/problems/commercial-burning-smell/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where uHi 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](https://commercialappliancerepair.center/services/commercial-controls-and-board-repair/) ## Delfield commercial appliances. For a Delfield station that runs warm by late lunch, we time the visit to a slow hour so the pans can come out and the rail can be tested empty. [Delfield commercial appliance repair](https://commercialappliancerepair.center/brands/delfield/) More Delfield codes [Hi](https://commercialappliancerepair.center/error-codes/delfield-hi/) [Lo](https://commercialappliancerepair.center/error-codes/delfield-lo/) [dEF](https://commercialappliancerepair.center/error-codes/delfield-def/) [E01](https://commercialappliancerepair.center/error-codes/delfield-e01/) [E02](https://commercialappliancerepair.center/error-codes/delfield-e02/) [LEA](https://commercialappliancerepair.center/error-codes/delfield-lea/) [uLi](https://commercialappliancerepair.center/error-codes/delfield-uli/) [off](https://commercialappliancerepair.center/error-codes/delfield-off/) Controls and power on other makes [Alto-Shaam E02](https://commercialappliancerepair.center/error-codes/alto-shaam-e02/) [Beverage-Air uLi](https://commercialappliancerepair.center/error-codes/beverage-air-uli/) [Blodgett Com Error](https://commercialappliancerepair.center/error-codes/blodgett-com-error/) [Dexter F1](https://commercialappliancerepair.center/error-codes/dexter-f1/) [Frymaster E19](https://commercialappliancerepair.center/error-codes/frymaster-e19/) [Garland E01](https://commercialappliancerepair.center/error-codes/garland-e01/) [Hatco Communication Error](https://commercialappliancerepair.center/error-codes/hatco-communication-error/) [Henny Penny E-4](https://commercialappliancerepair.center/error-codes/henny-penny-e-4/) [All 64 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-board) Delfield 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. Delfield 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 Delfield's own words > Line voltage too high, above 140 volts uHi [Delfield 6000XL and 6100XL Series reach-ins, installation, operation and maintenance manual, part 9294254 (archived copy of the delfield.com PDF)](https://web.archive.org/web/20260309094403/https://www.delfield.com/wp-content/uploads/2025/10/6000_IOM-Book_del_en_9294254.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Listed in the operation and indication table of Delfield's R290 reach-in manual (6000XL/6100XL) and prep table manual (4400/4500 Series). ## Delfield 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. 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Do not keep resetting the unit; note when uHi appears. If it comes back, it needs a visit. ### What causes uHi on a Delfield? Supply problems in the building, such as a loose neutral or a wiring error, are the usual reasons. An electrician measures before any part is changed. ### Is uHi on a Delfield dangerous? It can damage the unit's electrical parts over time. If you also notice a burning or hot electrical smell, switch the unit off at the breaker from a dry spot. ### Will uHi on a Delfield clear by itself? It clears when the voltage returns to normal. If it keeps coming back, the supply needs fixing. --- **[Read on the site: Delfield uHi: line voltage is above 140 volts](https://commercialappliancerepair.center/error-codes/delfield-uhi/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**