--- title: "Hestan smart rangetop showing ER04 | CooktopRepair.center" description: "What ER04 means on Hestan smart rangetops, what to check before booking, and when it is not a failure at all." url: "https://cooktoprepair.center/error-codes/hestan-er04/" --- # Hestan smart rangetop showing ER04 ER04 on a Hestan Smart Burner means main power to the appliance was lost while a cooking cycle was running. ## What ER04 actually means. ER04 on a Hestan Smart Burner means main power to the appliance was lost while a cooking cycle was running. Hestan cooktop display What to do when ER04 shows on the cooktop ### Kind of code Mode, not a failure A state the cooktop was put in, or one it picked deliberately — a child lock, a demo mode that lights the keys but heats nothing, a residual-heat letter over a zone that is still warm, a prompt that no pan has been found. Nothing has broken and no part is called for. ### Usually leads to No repair Restart the cooking cycle once power is back. ### Shows up as Cooktop Burner Won't Light The igniter clicks but the gas never catches, the burner lights only after several tries, or nothing happens at all when the knob is turned. ### Make Hestan A California maker of pro-style gas cooking, with rangetops for the home kitchen. ### Source Hestan KRT and KRTS rangetop use and care manual, Smart Burner error codes Hestan KRTS smart rangetop, Smart Burner only; the KRTS is not in Hestan's 2026 indoor catalog. KRT rangetops without the Smart Burner show no ER codes. ## Before you book, in this order. Each step comes from Hestan's own guidance for ER04 on its cooktops. Follow it to the end: the last card says whether this is a visit. 01 Restart the cooking cycle once power is back. 02 Check the breaker for the rangetop if the rest of the home kept its power. 03 Book a visit if ER04 appears with no power interruption at all. ### Cleared? The cooktop came right without a new part. If the same message returns while a zone or burner is on, or the top shuts itself down again mid-meal, treat it as a fresh problem and book it. ### What not to do ER04 is not a failure of the burner; it records a power interruption. It records that main power was lost during a cooking cycle. ## What you may notice with it. The cooktop problems ER04 tends to arrive with. Answer these at the cooktop before anyone is booked. [All problems](https://cooktoprepair.center/problems/) Before you call ### [Cooktop Burner Won't Light](https://cooktoprepair.center/problems/burner-wont-light/) [All 6 causes, cheapest first](https://cooktoprepair.center/problems/burner-wont-light/) It also comes with - [**Cooktop Error Code**](https://cooktoprepair.center/problems/cooktop-error-code/) Problem ### Cooktop Burner Won't Light 6 causes, cheapest first No repair indicated ## Nothing to repair. A state the cooktop was put in, or one it picked deliberately — a child lock, a demo mode that lights the keys but heats nothing, a residual-heat letter over a zone that is still warm, a prompt that no pan has been found. Nothing has broken and no part is called for. [How to read what your cooktop is telling you](https://cooktoprepair.center/problems/cooktop-error-code/) ## Hestan cooktops. A California maker of pro-style gas cooking, with rangetops for the home kitchen. [Hestan cooktop repair](https://cooktoprepair.center/brands/hestan/) More Hestan codes [ER01](https://cooktoprepair.center/error-codes/hestan-er01/) [ER02](https://cooktoprepair.center/error-codes/hestan-er02/) [ER03](https://cooktoprepair.center/error-codes/hestan-er03/) [ER05](https://cooktoprepair.center/error-codes/hestan-er05/) [ER06](https://cooktoprepair.center/error-codes/hestan-er06/) [ER07](https://cooktoprepair.center/error-codes/hestan-er07/) [ER08](https://cooktoprepair.center/error-codes/hestan-er08/) [ER09](https://cooktoprepair.center/error-codes/hestan-er09/) Mode, not a failure on other makes [Bertazzoni L](https://cooktoprepair.center/error-codes/bertazzoni-l/) [BlueStar u](https://cooktoprepair.center/error-codes/bluestar-u/) [Bosch dE](https://cooktoprepair.center/error-codes/bosch-de/) [Café Power arc / ON indicator blinking](https://cooktoprepair.center/error-codes/cafe-power-arc-blinking/) [Electrolux Hot](https://cooktoprepair.center/error-codes/electrolux-hot/) [Fisher & Paykel P](https://cooktoprepair.center/error-codes/fisher-and-paykel-p/) [Frigidaire HE](https://cooktoprepair.center/error-codes/frigidaire-he/) [Gaggenau F8](https://cooktoprepair.center/error-codes/gaggenau-f8/) [All 59 codes of this kind](https://cooktoprepair.center/error-codes/#family-mode) Hestan builds this ### Induction cooktop A glass cooktop in the counter that heats the pan itself through magnetic coils, run by power boards and cooled by a fan underneath. Hestan builds this ### Rangetop A pro-style gas cooking top with its knobs across the front, set into a notch above a base cabinet, often with a griddle or char-broiler beside the burners. ## In Hestan's own words > ER04 - Power loss during cooking cycle [Hestan KRT and KRTS rangetop use and care manual, Smart Burner error codes](https://cdn.brandfolder.io/W2HABDQZ/as/p662kxzmr55n7mhwcmq6g4/Rangetop_Use_and_Care_Manual.pdf) [Hestan KRT and KRTS rangetop use and care manual, Smart Burner error codes](https://cdn.brandfolder.io/W2HABDQZ/as/p662kxzmr55n7mhwcmq6g4/Rangetop_Use_and_Care_Manual.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Hestan KRTS smart rangetop, Smart Burner only; the KRTS is not in Hestan's 2026 indoor catalog. KRT rangetops without the Smart Burner show no ER codes. ## Hestan ER04 cooktop 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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Restart the cooking cycle once power is back. ### Why did my Hestan Smart Burner show ER04 after a storm? A power cut stopped the cooking cycle. Restart it. ### Should I book a visit for ER04? Only if it appears without any power interruption in the home. ### Does ER04 on a Hestan KRTS Smart Burner mean the rangetop lost power? Yes, it records that main power to the appliance was lost while a cooking cycle was running. The cycle stops, so start it again once power is steady. --- **[Read on the site: Hestan smart rangetop showing ER04 | CooktopRepair.center](https://cooktoprepair.center/error-codes/hestan-er04/)** **[Book a visit with CooktopRepair.center](https://cooktoprepair.center/schedule/)**