If at any time during the tenancy the landlord fails to carry out the duties required by RCW 59.18.060 or by the rental agreement, the tenant may, in addition to pursuit of remedies otherwise provided him or her by law, deliver written notice to the person designated in *RCW 59.18.060(14), or to the person who collects the rent, which notice shall specify the premises involved, the name of the owner, if known, and the nature of the defective condition. The landlord shall commence remedial action after receipt of such notice by the tenant as soon as possible but not later than the following time periods, except where circumstances are beyond the landlord's control:
In each instance the burden shall be on the landlord to see that remedial work under this section is completed promptly. If completion is delayed due to circumstances beyond the landlord's control, including the unavailability of financing, the landlord shall remedy the defective condition as soon as possible.
RCW 59.18.070
*Reviser's note:RCW 59.18.060 was amended by 2013 c 35 s 1, changing subsection (14) to subsection (15).