For some reason, our pool water is barely circulating. The pump is on and running, but pressure is low, and cell cartridges were recently replaced. (So problem seems to be suction?) Valves are in the correct position, and regardless of what 'mode' they are in, water still does not circulate... In spa mode, the gas heater still triggers on, so water seems to be moving just enough for that, but is otherwise barely visible...