--- title: "Rational Service 41: scale is blocking the steam injection nozzle" description: "What Service 41 means on Rational Service 41: scale is blocking the steam injection nozzles, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/rational-service-41/" --- # Rational Service 41: scale is blocking the steam injection nozzle Some iCombi Pro functions inject water through a nozzle into the cabinet to make steam directly. ## What Service 41 actually means. Some iCombi Pro functions inject water through a nozzle into the cabinet to make steam directly. Service 41 reports scale on that nozzle or its pipe. Until it is cleared, the oven will not use steam injection. Rational commercial appliance display · also shown as 41 What to do when Service 41 shows on the commercial appliance ### Kind of code Water, fill and drain Water is not arriving, not reaching its level, not heating or not leaving on time. A dish machine may be short of fill because a supply valve is half closed or its line strainer is clogged, it may drain slowly through a scrap basket full of debris, or its booster may be too scaled to heat the rinse; a combi's steam generator may be scaled or its water treatment exhausted; a washer-extractor may time out on a slow drain. Opening the supply valve, cleaning strainers with the unit off and checking the drain line are fair; a pump, a fill valve, a heater or a leak near wiring is a visit. ### Usually leads to Dish machine repair Undercounter, door-type and conveyor dish machines: tank heaters, boosters, wash pumps, fill and drain valves. ### 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 Rational A Rational visit is timed after the evening cleaning cycle, when the cabinet is cool and the display can be read without a load inside. ### Source RATIONAL iCombi Pro floor units 20-1/1 and 20-2/1, original instructions for use (US English) Listed in the error message tables of the iCombi Pro floor unit instructions for use (models 20-1/1 and 20-2/1, US English edition). ## Before you book, in this order. Each step comes from Rational's own guidance for Service 41 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Power the oven down and wait for the nozzle area to cool. 02 Descale the steam nozzle as the manual describes: remove it with a hex key, soak it in descaler with gloves and a mask on, rinse it, dry it and refit it. 03 If Service 41 comes back soon after descaling, book a visit and ask about your water hardness and filtering. ### Still there? It usually turns into [dish machine repair](https://commercialappliancerepair.center/services/dish-machine-repair/). Book with the code and the model number. ### What not to do Service 41 is not about the main steam generator; that has its own care status indicator and messages. It does not stop dry heat cooking, only the steam injection function. ## What you may notice with it. The commercial appliance problems Service 41 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 - [**Combi Oven Steam Problem: Weak Steam, Scale or a Dry Cavity**](https://commercialappliancerepair.center/problems/combi-oven-steam-problem/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where Service 41 usually leads ## Dish machine repair. **Dish machine tank heater or booster element, thermostat, fill valve, float switch, drain valve, wash pump seal or motor, conveyor drive · moderate.** Book a visit [What the job involves](https://commercialappliancerepair.center/services/dish-machine-repair/) ## Rational commercial appliances. A Rational visit is timed after the evening cleaning cycle, when the cabinet is cool and the display can be read without a load inside. [Rational commercial appliance repair](https://commercialappliancerepair.center/brands/rational/) More Rational codes [Service 10](https://commercialappliancerepair.center/error-codes/rational-service-10/) [Service 11](https://commercialappliancerepair.center/error-codes/rational-service-11/) [Service 20.1](https://commercialappliancerepair.center/error-codes/rational-service-20-1/) [Service 25](https://commercialappliancerepair.center/error-codes/rational-service-25/) [Service 28.2](https://commercialappliancerepair.center/error-codes/rational-service-28-2/) [Service 29](https://commercialappliancerepair.center/error-codes/rational-service-29/) [Service 31.1](https://commercialappliancerepair.center/error-codes/rational-service-31-1/) [Service 32.1](https://commercialappliancerepair.center/error-codes/rational-service-32-1/) [Service 40](https://commercialappliancerepair.center/error-codes/rational-service-40/) [Service 42.1](https://commercialappliancerepair.center/error-codes/rational-service-42-1/) [Service 47.1](https://commercialappliancerepair.center/error-codes/rational-service-47-1/) [Service 50](https://commercialappliancerepair.center/error-codes/rational-service-50/) [All 15 Rational codes](https://commercialappliancerepair.center/error-codes/#codes-rational) Water, fill and drain on other makes [Alto-Shaam E01](https://commercialappliancerepair.center/error-codes/alto-shaam-e01/) [Blodgett Water Level Error](https://commercialappliancerepair.center/error-codes/blodgett-water-level-error/) [Cleveland LOW WATER light](https://commercialappliancerepair.center/error-codes/cleveland-low-water-light/) [Dexter F2](https://commercialappliancerepair.center/error-codes/dexter-f2/) [Frymaster E33](https://commercialappliancerepair.center/error-codes/frymaster-e33/) [Hatco LO H2O](https://commercialappliancerepair.center/error-codes/hatco-lo-h2o/) [Hobart 019](https://commercialappliancerepair.center/error-codes/hobart-019/) [Miele Professional F18](https://commercialappliancerepair.center/error-codes/miele-professional-f18/) [All 43 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-water) Rational 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 Rational's own words > The steam injection nozzle or the steam injection pipe has scale. [RATIONAL iCombi Pro floor units 20-1/1 and 20-2/1, original instructions for use (US English)](https://hcms.rational-online.com/hcms/v1.7/entity/documents/155435/storage/MTU1NDM1LzAvbWFzdGVyLy8vMTAxNTcwMzIw/download/manual_original_instruction_icombi_pro_20-1_1,_20-2_1_english_usa.pdf) [RATIONAL iCombi Pro floor units 20-1/1 and 20-2/1, original instructions for use (US English)](https://hcms.rational-online.com/hcms/v1.7/entity/documents/155435/storage/MTU1NDM1LzAvbWFzdGVyLy8vMTAxNTcwMzIw/download/manual_original_instruction_icombi_pro_20-1_1,_20-2_1_english_usa.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Listed in the error message tables of the iCombi Pro floor unit instructions for use (models 20-1/1 and 20-2/1, US English edition). ## Rational Service 41 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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Power the oven down and wait for the nozzle area to cool. If it comes back, it needs a visit. ### Can I clear Service 41 on a Rational myself? The manual describes descaling the steam nozzle as an operator task with a hex key and descaler. Wear chemical gloves and a mask as Rational warns, and book a visit when the number is back within days. ### Why does my Rational keep getting Service 41? Hard water leaves scale fast. A technician can check whether the water treatment ahead of the oven suits your supply. ### Does Service 41 stop my Rational from cooking? Only steam injection is unavailable. Other cooking still works while you arrange the descaling. --- **[Read on the site: Rational Service 41: scale is blocking the steam injection nozzle](https://commercialappliancerepair.center/error-codes/rational-service-41/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**