1. Shut off the power to the WPU.
  2. Remove the bottom left and right panels.
  3. Remove the wire junctions.
  4. Place a board or a metal sheet against the evaporator coil to protect it during fan replacement.
  5. Remove the 6 nuts securing the fan assembly to the unit.
  6. Replace the fan in the assembly with the new part.
  7. Place the fan assembly into the unit and refasten the 6 nuts.
  8. Reconnect the wiring per the wiring diagram and remove the board or sheet protecting the evaporator coil. Ensure that all connections are watertight.