Organization Regulations on Employee Welfare Committee Article 8

When the chairperson cannot perform his or her duties for specific reason(s), the deputy chairperson shall take charge; a chairperson shall be elected by the members if there is no deputy chairpersonWhen the number of employee welfare committee members decreases below one-half of the required number, the units concerned will be notified to elect new members.
中文原文 職工福利委員會組織準則第8條
主任委員因故無法執行職務者,由副主任委員遞補。
無副主任委員者,由委員推選遞補。
職工福利委員會委員人數不足半數者,應即通知原產生單位另行推選。

English translation for reference only; the Chinese text prevails. Not legal advice.