Schwank ThermoControl Plus 4 - Manual (Page 31)

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Holiday Programming
: When modifying the holiday program
the “ERROR“ signal will appear if the starting(A) or ending(B)
dates or calendar data are in conflict. (for example: the end
date is earlier than the start date of a holiday period) In case of
data entry error, the holiday program won’t activate.
This display represents a very rare error: a button on the front
panel is jammed in the depressed position.
Please check button orientations!