Yes, indeed, the administrator is bound to follow the instructions of the president.
Section 20 provides for the duties of administrators
It shall be the function of the administrator:
(a) To watch over the proper management of the commonhold, its installations and services, and to advise and admonish owners to that effect.
(b) To prepare the budget of predictable expenses with sufficient anticipation and to submit it to the Owners’ Committee, proposing measures to cover the expenses.
(c) To see to the upkeep and maintenance of the commonhold, arranging for urgent repairs and measures, reporting promptly to the president or, where appropriate, to the owners.
(d) To carry out the decisions adopted regarding maintenance works and to make and receive payments as appropriate.
(e) To act, where applicable, as secretary of the Owners’ Committee and to keep custody of commonhold documents available for the owners.
(f) Any other function conferred by the Owners’ Committee.