--- title: "JennAir DESCALE! MEDIUM CUP: the built-in espresso unit needs its cleaning program" description: "What DESCALE! MEDIUM CUP means on JennAir DESCALE! MEDIUM CUP: the built-in espresso unit needs its cleaning programs, what to check before booking, and when it…" url: "https://appliancemaintenance.center/error-codes/jennair-descale-medium-cup/" --- # JennAir DESCALE! MEDIUM CUP: the built-in espresso unit needs its cleaning program JennAir's built-in coffee maker spells this message out directly on the display when calcium deposits from water minerals have built up in the machine, and JennAir warns that leaving it unattended can hinder espresso unit performance. ## What DESCALE! MEDIUM CUP actually means. JennAir's built-in coffee maker spells this message out directly on the display when calcium deposits from water minerals have built up in the machine, and JennAir warns that leaving it unattended can hinder espresso unit performance. JennAir home appliance display · also shown as DESCALE! What to do when DESCALE! MEDIUM CUP shows on the home appliance ### Kind of code Scale and descaling Minerals from the water supply have built up where the appliance heats or freezes water: a steam oven's generator, a built-in coffee system, a dishwasher's heating path, an ice maker's mold and valve. The appliance asks for a descale because scale slows heating and blocks small passages. Run the descaling program with the descaler the maker names, check the water-hardness setting against your local water, and put the next descale on the calendar. ### Usually leads to Water filter and descaling service Fresh filters in dispensers and ice makers, and scale cleared from steam ovens, ice makers and dish care machines. ### Shows up as Appliance Maintenance Code or Reminder Light: Filter, Descale, Vent Check An appliance maintenance code is a reminder, icon or short code on a display asking for a filter change, descaling, a tub clean, rinse aid or an exhaust check rather than reporting a broken part. ### Make JennAir JennAir kitchens are largely built in, so the visit pays special attention to column refrigeration grilles, downdraft and hood filters, and panel-ready dishwashers. ### Source JennAir support: DESCALE! MEDIUM CUP, Built-In Coffee Maker Documented on JennAir's built-in coffee maker with the medium-cup setting; JennAir warns that an interrupted descaling cycle has to be restarted from the beginning. ## Before you book, in this order. Each step comes from JennAir's own guidance for DESCALE! MEDIUM CUP on its home appliances. Follow it to the end: the last card says whether this is a visit. 01 Start the descaling program from the coffee system's menu as soon as the message appears. 02 Follow JennAir's detailed "Descaling the Coffee Maker" guide for the exact steps and solution for the model. 03 Let the cycle run to completion without interrupting it. 04 If the display still shows the message after a full descaling cycle, book a visit rather than run the program repeatedly. ### Still there? It usually turns into [water filter and descaling service](https://appliancemaintenance.center/services/water-filter-and-descaling-service/). Book with the code and the model number. ### What not to do This is a mineral-scale alert cleared by descaling, not a heating or brewing-mechanism failure. JennAir's own warning is about decreased performance and possible product damage from skipping it, not about the machine failing to power on. ## What you may notice with it. The home appliance problems DESCALE! MEDIUM CUP tends to arrive with. Answer these at the home appliance before anyone is booked. [All problems](https://appliancemaintenance.center/problems/) Before you call ### [Appliance Maintenance Code or Reminder Light: Filter, Descale, Vent Check](https://appliancemaintenance.center/problems/appliance-maintenance-code/) [All 8 causes, cheapest first](https://appliancemaintenance.center/problems/appliance-maintenance-code/) It also comes with - [**White Scale on Appliance Water Parts: Steam Ovens, Ice Makers, Dish Care**](https://appliancemaintenance.center/problems/scale-on-water-parts/) Problem ### Appliance Maintenance Code or Reminder Light: Filter, Descale, Vent Check 8 causes, cheapest first Where DESCALE! MEDIUM CUP usually leads ## Water filter and descaling service. **Water filters replaced and flushed, inlet screens checked, descaling run on a steam oven, ice maker or dish care machine · low.** Book a visit [What the job involves](https://appliancemaintenance.center/services/water-filter-and-descaling-service/) ## JennAir home appliances. JennAir kitchens are largely built in, so the visit pays special attention to column refrigeration grilles, downdraft and hood filters, and panel-ready dishwashers. [JennAir home appliance maintenance](https://appliancemaintenance.center/brands/jennair/) More JennAir codes [Descale is needed](https://appliancemaintenance.center/error-codes/jennair-descale-is-needed-wall-oven/) [Replace Filter](https://appliancemaintenance.center/error-codes/jennair-water-filter-status/) Scale and descaling on other makes [Bertazzoni Descaling needed. Press OK to start (~45min)](https://appliancemaintenance.center/error-codes/bertazzoni-coffee-descaling-needed/) [Bosch E12](https://appliancemaintenance.center/error-codes/bosch-e12/) [Cove Descale Unit. Check manual.](https://appliancemaintenance.center/error-codes/cove-descale-unit/) [DCS CLEAN](https://appliancemaintenance.center/error-codes/dcs-outdoor-ice-clean/) [Fisher & Paykel DESCALING NEEDED](https://appliancemaintenance.center/error-codes/fisher-and-paykel-coffee-descaling-needed/) [Fulgor Milano PLEASE DESCALE!](https://appliancemaintenance.center/error-codes/fulgor-milano-coffee-please-descale/) [Gaggenau E:2060](https://appliancemaintenance.center/error-codes/gaggenau-e-2060/) [KitchenAid Descale is needed](https://appliancemaintenance.center/error-codes/kitchenaid-descale-is-needed-wall-oven/) [All 15 codes of this kind](https://appliancemaintenance.center/error-codes/#family-scale) JennAir builds this ### Cold storage Upkeep for everything in the house that keeps things cold: refrigerators, freezers, wine and beverage units and ice makers, cleaned and checked before they start struggling. JennAir builds this ### Cooking appliances Upkeep for ovens, ranges, cooktops, hoods, microwaves, steam and speed ovens: burners and igniters cleaned, gas joints checked, grease filters and descaling done on time. JennAir builds this ### Dish care Upkeep for dishwashers and disposers: filters rinsed, spray arms cleared, the door seal and drain loop checked, and hard-water scale kept off the parts that heat and spray. ## In JennAir's own words > The descaling program must be run as soon as possible. [JennAir support: DESCALE! MEDIUM CUP, Built-In Coffee Maker](https://producthelp.jennair.com/Cooking/Built-In_Coffee_Makers/Messages_or_Error_Codes/DESCALE!_-_MEDIUM_CUP_-_Error_Code_-_Built-In_Coffee_Maker) [JennAir support: DESCALE! MEDIUM CUP, Built-In Coffee Maker](https://producthelp.jennair.com/Cooking/Built-In_Coffee_Makers/Messages_or_Error_Codes/DESCALE!_-_MEDIUM_CUP_-_Error_Code_-_Built-In_Coffee_Maker) [JennAir support: DESCALE! MEDIUM CUP, Built-In Coffee Maker](https://producthelp.jennair.com/Cooking/Built-In_Coffee_Makers/Messages_or_Error_Codes/DESCALE!_-_MEDIUM_CUP_-_Error_Code_-_Built-In_Coffee_Maker) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Documented on JennAir's built-in coffee maker with the medium-cup setting; JennAir warns that an interrupted descaling cycle has to be restarted from the beginning. ## JennAir DESCALE! MEDIUM CUP home appliance maintenance, 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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MEDIUM CUP. ### Can I clear DESCALE! MEDIUM CUP myself? Start the descaling program from the coffee system's menu as soon as the message appears. If it comes back, it needs a visit. ### What happens if I interrupt the descaling cycle on my JennAir espresso unit? JennAir says the cycle will need to be restarted from the beginning if it is interrupted partway through, so it is worth setting aside enough time to let it finish uninterrupted. ### Can I keep brewing coffee while DESCALE! MEDIUM CUP is showing on my JennAir system? JennAir's own guidance is to run the descaling program as soon as possible, warning that skipping it regularly can decrease performance and potentially damage the machine. ### Does hard water make the DESCALE! message come up more often on a JennAir espresso unit? JennAir ties the message to calcium deposits building up over time, which is directly related to the mineral content of the water supply, so harder water will generally trigger it more often. --- **[Read on the site: JennAir DESCALE! MEDIUM CUP: the built-in espresso unit needs its cleaning program](https://appliancemaintenance.center/error-codes/jennair-descale-medium-cup/)** **[Book a visit with ApplianceMaintenance.center](https://appliancemaintenance.center/schedule/)**