Service Manual

I live in Prince George BC Canada and there are no repair or service technichians in Western Canada. I have to fly service techs in to Prince George. My machine is giving a familiar error code "Flowsw Error. It isually comes on if my water level is low. After doing some research I learned the water filter ks to be changed every 6-12 months. Mine has not been changed since 2019. If i cojld learn how to service my machine it would be like winning the lottery. I am right now jn the process of trying to find a service tech as my business is closed until the machine is running again.