Steam in display unit - now only displays squares, no writing

did you check the water tank

If you want to square an expression enclose it in parentheses and raise to the second power.

Hi my name is Mike with Mr. Steam please give me a call at 1-800-767-8326 and ask for tech support. We will need you model # and SN # that is listed on your unit if you can be by your unit when you call and we will help troubleshoot your unit. In the mean time check the following 1) water is on 2) drain valve closed even if you have a auto flush close manuel valve for testing
Thanks
Mike Nail
Mr. Steam

The steam pipe after the steam solenoid to the steam arm is leaking which it can be cause just becase the support nut is loose. So if you just remove the top plastic panel you can even use the machine and see which point need to tight it up.
Good luck.
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You need to get this unit to a repairer asap as water will damage your control board.

o O means that the unit needs to be descaled. See your owners manual for the procedure. If the unit displays O - - o, the safety lock has been activated. Again, see your owner's manual.

Check the tip of the steam wand make sure it is not blocked. If not then press in on the steam knob after opening, if that works then the steam valve assembly needs to be replaced.

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You have to buy descaling tablets from miele.  You turn the knob to program mode and keep pushing the enter button until you get to descaling.  You put two descaling tablets into your water reservoir and replace into unit.  Put containers under the steam valve and the hot water wand. Press enter.  Turn steam valve al the way on.  Keep an eye on the containers.  The process takes about 30 to 40 minutes.  The message will appear 'Descaling finished." Turn steam selector to O and press enter.  Display will read "rinse machine, fill watertank.  Fill tank and return to machine.  Place empty containers beneath hot water dispenser and steam nozzle again and turn steam selector fully on. Allow water to run through system completely.  When process is finished, display will read "Rinsing Finished."  Turn steam selector to O and press enter  Program selector is on Program Mode and display will read Descaling, Timrt, unit is no descaled and ready to use.  Turn program selector to on.

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