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According to the CRCNA Church Order 2015, nominations for office are presented by the council.
Article 4 a. In calling and electing to an office, the council shall ordinarily present to the congregation a nomination of at least twice the number to be elected. When the council submits a nomination which totals less than twice the number to be elected, it shall give reasons for doing so.
The council is "composed of the minister(s), the elders, and the deacons", Page 71.
The members of the congregation then vote on the nominees.
The classis (representatives from a group of churches within a particular region) also has to approve the ordination or appointment of ministers, as per Article 10.
Article 10
a. The ordination of a candidate for the ministry of the Word requires the approval of the classis of the calling church and of the synodical deputies. The classis, in the presence of the deputies, shall examine the candidate concerning the candidateβs doctrine and life in accordance with synodical regulations. The ordination shall be accompanied by the laying on of hands by the officiating minister.
b. The installation of a minister shall require the approval of the classis of the calling church or its interim committee, to which the minister shall have previously presented good ecclesiastical testimonials of doctrine and life which have been provided by the former council and classis.
It is not immediately obvious to me what is done in the event of a minister whose opinion on a doctrine changes from orthodoxy to heresy, after his ordination. If anyone knows, please comment and I will update my answer.
In general, I would recommend reading the CRCNA Church Order for more details on ordination and appointment of ministers. Note: I don't belong to the CRCNA, so I may have misunderstood the application or details of their church order myself. If any discrepancies are found, I will update my answer.