Wash. Rev. Code § 51.32.210
Claims of injured workers of employers who have secured the payment of compensation by insuring with the department shall be promptly acted upon by the department. Where temporary disability compensation is payable, the first payment thereof shall be mailed within fourteen days after receipt of the claim at the department's offices in Olympia and shall continue at regular semimonthly intervals. The payment of this or any other benefits under this title, prior to the entry of an order by the department in accordance with RCW 51.52.050 as now or hereafter amended, shall be not considered a binding determination of the obligations of the department under this title. The acceptance of compensation by the worker or his or her beneficiaries prior to such order shall likewise not be considered a binding determination of their rights under this title.
RCW 51.32.210