I recently had a party with a lot of kids. They were running around the yard and jumping in and out of the hot tub. I didn't realize how much grass they were tracking in and out til the next day when I went to add chemicals. The code on the display read, dr, and heating was disabled. I checked the filters and they were loaded with grass, and so were the intakes in the lower well. I think grass got into my lines and has clogged them and now I have low flow to the heater. Is there a way to check this out without having to pull pumps and heater?