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  • Descaling Rational SelfCooking Center Oven model SCCWE61E

     technick updated 8 months, 3 weeks ago 6 Members · 13 Posts
  • sanket

    November 4, 2019 at 8:53 pm

    Tips or Video on Descaling Rational Oven model SCCWE61E

  • techtownmayor

    November 5, 2019 at 9:56 am

    Hi sanket, and welcome to techtown!
    Without knowing the model number of your oven, I’ll have to wait till some of our Rational experts visit this thread.
    EDIT: Please follow the steps outlined by our members below.

  • techjoeb

    November 5, 2019 at 10:30 am

    Sanket- Please refer to the manufacturer site and download the appropriate user guide for your model and follow the instructions in the manual. I hope this helps! 

  • fixbear

    November 5, 2019 at 2:59 pm

    May I ask what model oven you have?

    • sanket

      November 5, 2019 at 10:11 pm


  • ectofix

    November 5, 2019 at 7:40 pm

    Yes.  A model number is necessary. 

    Depending on the model number and how long it’s been since it was last descaled, doing a proper descaling may be WAY more involved than you may realize.  If you screw it up, you gotta real bad mess on your hands.

    Please provide a model number and give us some idea as to how long it’s been since it was last descaled.

    • sanket

      November 5, 2019 at 10:11 pm


      Machine in use for 2 years and never descaled 

  • ectofix

    November 6, 2019 at 5:30 am

    Yes, so the “decalcifier step” document linked above does NOT apply to your oven.  For that matter, the operators manual linked on PartsTown for a SCCWE61E is incorrect too.

    Here’s the correct manual:

    SelfCookingCenter ®Original Operating Instructions

    So, your question is how to descale it. 

    The first thing to note is, if you’ve followed a regular cleaning routine as shown beginning on page 91 of that manual, then an actual manual descaling of the oven may not be necessary. 

    That’s my next question.  Has this oven been cleaned REGULARLY using these red and blue packaged chemicals?

    Cleaning tabs

    CareControl tabs

  • sanket

    November 6, 2019 at 10:24 am

    Yes They have being cleaned on a daily basis with the red and blue chemicals 

  • ectofix

    November 6, 2019 at 5:34 pm

    Well, if they clean it THAT often, then there shouldn’t be ANY scale buildup in the boiler.

    You never said whether the oven is showing some indication of a need to descale.  Was there any such notification (such as CALC CHECK), or are you simply wanting to do it because it’s the right thing to do?
    That oven has a water volume sensor which measures incoming water volume during each fill cycle of the boiler.  The water volume sensor is central to the calcium diagnostics system, or “CDS”. 
    With that system, the results of its LAST fill cycle (measured in LITERS) can be viewed in technician-level programming.  Also in that mode, you can view the volume of what a pristinely clean boiler will take to fill (also in liters), and at what measurement the oven’s control will display CALC CHECK to indicate there’s heavy limescale buildup.
    I can’t publish the password for entering into tech level of programming, but I found it publicly available on the internet anyway.  I think I can share that.  Page 53:

    • That’s an earlier manual, so if the oven’s software has been kept up-to-date, your oven’s display will different.  The password is the same, though.

    <div>Anyway, you can use the aforementionednumbers in the CDS system to determine whether it needs to be descaled, or you can simply drain the boiler and do a visual inspection.  If you see any whitish flakes in the boiler, then it wouldn’t hurt to do a manual chemical descale. 
    If there are ROCKS in there, then you’d want to employ a shop-vac, a hammer and a length of copper pipe as a make-shift chisel to break up the chunks through the SC pump’s port.  If it’s REALLY bad, you might have to remove the elements for greater access.  At any rate, if such physical extraction is necessary, after you’ve done so, follow up with a proper CHEMICAL descale.
    SO…back to your original question.  How do you descale it? 
    Well, the procedure is meant for factory-trained technician to do.  I can’t publish the manual that covers how to do that, but…guess WHAT!  It’s already been made public on the internet TOO!  I’ll share THAT with you.  Go to page 141:
    Instruction for manual descaling

    Yes, that manual is for an earlier oven, but the steps are the same.

    I caution you that the procedure requires knowledge of the components, how the oven’s overall system works…and a keen awareness of what’s going on every step of the way while you’re descaling it.
    Again, if you don’t do it right and make a mistake somewhere, you’ll have a real mess of a very corrosive chemical on your hands.  It can hurt you…and it can ruin some components in the oven if it gets spilled into the component compartment.
    FOUR key points to remember:


    1. The descaler should ONLY be put into the boiler through the steam port inside the oven’s cooking compartment by using a pump.
    2. If you spill any descaler…or if it comes bubbling out of the steam port from chemical reaction, thoroughly rinse out the cooking compartment with hand shower.
    3. Make ABSOLUTELY sure that the SC pump works BEFORE beginning, since that’s the primary means to remove the descaling solution.
    4. Once the descaling solution is out – flush, FLUSH and FLUSH – with clean water via function testing of the FILL valve. 
      • OVERFILL the boiler until it’s running down into the floor drain…all three times. 
      • Fill a forth time and run in steam mode for fifteen minutes. 
      • Follow that by function-testing the fill valve again, letting the overflow run into the floor drain for awhile. 
      • The idea here is to “temper” the water before function-testing the SC pump, thereby not making the pump work with boiling hot water – to avoid damaging it.
    5. Run the SC pump to drain the boiler one last time.
    6. Thoroughly rinse the cooking compartment one last time with the hand shower.

    That’s it!  That’s how I do it.
    Now you can let it fill on its own and let them use it.

  • sanket

    November 19, 2019 at 7:38 pm

    Thought I would let you know. Done it was really easy I havnt done one is 2 years so was little confused but it is really easy if you follow steps 

    • techtownmayor

      November 20, 2019 at 4:22 pm

      Glad to hear it went well! Thanks for providing your update. 

    • technick

      November 20, 2019 at 6:11 pm

      Make sure you reset the water volume in the generator after descaling. I believe this option is in “basic settings”

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