Oregon Revised Statutes Procedure in Civil Proceedings § 14.210

(a) The judge shall not act as judge if the judge is a party to or directly interested in the action, suit or proceeding, except that the judge shall not be disqualified from acting as such in a case in which the judge is added as a party after taking any official action as a judge in the action, suit or proceeding, and in that case the judge shall be dismissed as a party without prejudice.

(b) Except as provided in ORS 2.111 and 2.570, a judge shall not act as judge if the judge was not present and sitting as a member of the court at the hearing of a matter submitted for its decision. A judge may sign an order or judgment reflecting a decision made by another judge if, for good cause, the judge who made the decision is not available.

(c) A judge shall not act as judge if the judge is related to any party, or to the attorney for any party, or to the partner or office associate of any such attorney, by consanguinity or affinity within the third degree.

(d) A judge shall not act as judge if the judge has been attorney in the action, suit or proceeding for any party.

(e) If appeal is made from a decision of another court, or judicial review of a decision of an administrative agency is sought, a judge shall not act as judge on appeal if the judge participated in making the decision that is subject to review.