Section 175Omnibus Election Code of the Philippines (Batas Pambansa Blg. 881), Sec. 175

Temporary vacancies. - If, at the time of the meeting of the board of election inspectors, any member is absent, or the office is still vacant, the members present shall call upon the substitute or the absent members to perform the duties of the latter; and, in case such substitute cannot be found, the members present shall appoint any non-partisan registered voter of the polling place to temporarily fill said vacancy until the absent member appears or the vacancy is filled.

In case there are two or more members present, they shall act jointly: Provided, That if the absent member is one who has been proposed by an accredited political party, the representative of said political party or in his absence the watchers belonging to said party shall designate a registered voter of the polling place to temporarily fill said vacancy: Provided, further, That in the event or refusal or failure of either representative or watchers of said political party to make the designation, the members of the board of election inspectors present shall choose a non-partisan registered voter of the polling place to fill the vacancy.