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One moment while I get some information for you!
Did you turn the selector to program mode position then press E to have DESCALING with the Asterisk on then press ENTER?
What does it do when you press enter?
OK unplug the unit for a minute and try the descaling procedure again
That is in a programming mode not an error.
Try to access service mode, then cancel out of it see if you can do that
Did you not get my link?
I had to leave and just got back if you are not comfortable doing that you may want a tech to come out then