--- title: "Vulcan E4: the oven control board is running hot" description: "What E4 means on Vulcan E4: the oven control board is running hots, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/vulcan-e4/" --- # Vulcan E4: the oven control board is running hot Behind the VC5 control panel is a board that needs cooling air. ## What E4 actually means. Behind the VC5 control panel is a board that needs cooling air. When it runs above its rated limit, the display shows E4. Vulcan names a clogged rear air intake and a failed cooling fan as the likely causes. Vulcan commercial appliance display · also shown as E 4 What to do when E4 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 Vulcan Vulcan equipment is often seen after close, once the line has been scraped down and every burner has cooled. ### Source Vulcan gas convection ovens installation and operation manual, form 31123 Rev. R (VC4GD, VC5GD, VC6GD) Vulcan VC5GD gas convection ovens with the digital temperature display (form 31123). VC4 and VC6 ovens with solid-state or computer controls are covered by separate controls. ## Before you book, in this order. Each step comes from Vulcan's own guidance for E4 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Without moving the oven, look behind it for lint, grease or a carton pressed against the rear air intake. 02 Clear the space behind and beside the oven so it can draw cool air. 03 Check whether a broiler or fryer next to the oven blows hot air toward the controls. 04 Book a visit if E4 returns with a clear intake, since the cooling fan may have stopped. ### 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 E4 is not a cavity temperature alarm; the oven itself may be baking normally. It is a warning about the electronics, which Vulcan notes can reduce the life of the control components. ## What you may notice with it. The commercial appliance problems E4 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 E4 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/) ## Vulcan commercial appliances. Vulcan equipment is often seen after close, once the line has been scraped down and every burner has cooled. [Vulcan commercial appliance repair](https://commercialappliancerepair.center/brands/vulcan/) More Vulcan codes [IGNITION LOCKOUT](https://commercialappliancerepair.center/error-codes/vulcan-ignition-lockout/) [PILOT OUT](https://commercialappliancerepair.center/error-codes/vulcan-pilot-out/) [PROBE OPEN](https://commercialappliancerepair.center/error-codes/vulcan-probe-open/) [PROBE SHORT](https://commercialappliancerepair.center/error-codes/vulcan-probe-short/) [HIGH TEMP](https://commercialappliancerepair.center/error-codes/vulcan-high-temp/) [VATFULL? PUSH V](https://commercialappliancerepair.center/error-codes/vulcan-vatfull/) [E1](https://commercialappliancerepair.center/error-codes/vulcan-e1/) [E3](https://commercialappliancerepair.center/error-codes/vulcan-e3/) [E7](https://commercialappliancerepair.center/error-codes/vulcan-e7/) [No Heat](https://commercialappliancerepair.center/error-codes/vulcan-no-heat/) [E10](https://commercialappliancerepair.center/error-codes/vulcan-e10/) [E32](https://commercialappliancerepair.center/error-codes/vulcan-e32/) [All 15 Vulcan codes](https://commercialappliancerepair.center/error-codes/#codes-vulcan) 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/) [Delfield uLi](https://commercialappliancerepair.center/error-codes/delfield-uli/) [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/) [All 64 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-board) Vulcan 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 Vulcan's own words > PCB Overheat [Vulcan gas convection ovens installation and operation manual, form 31123 Rev. R (VC4GD, VC5GD, VC6GD)](https://www.vulcanequipment.com/sites/default/files/webdam_asset/89979761.pdf) [Vulcan gas convection ovens installation and operation manual, form 31123 Rev. R (VC4GD, VC5GD, VC6GD)](https://www.vulcanequipment.com/sites/default/files/webdam_asset/89979761.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Vulcan VC5GD gas convection ovens with the digital temperature display (form 31123). VC4 and VC6 ovens with solid-state or computer controls are covered by separate controls. ## Vulcan E4 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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Without moving the oven, look behind it for lint, grease or a carton pressed against the rear air intake. If it comes back, it needs a visit. ### Where is the air intake on a Vulcan VC5? At the rear of the oven. Vulcan's error table points to page 20 of the manual for keeping it clear. ### Can I keep baking with E4 on my Vulcan? Usually the oven still bakes, but every hour at high board temperature shortens its life. Clear the intake the same day. ### Why did E4 start after we moved equipment on our line? A new neighbor can push hot air or block the rear intake. Check the clearance behind the oven before booking. --- **[Read on the site: Vulcan E4: the oven control board is running hot](https://commercialappliancerepair.center/error-codes/vulcan-e4/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**