What is the reason that the pump of a biomass-fired is not pumping water?

If there is air in the pump or suction pipe, the air should be discharged.
If the depth of the bottom valve immersed in the water is not deep enough, the depth should be increased.
If the rotational speed is too slow or the conveyor belt is too loose, the rotational speed should be adjusted and the conveyor belt should be tightened.
If the impeller, suction pipe and bottom valve are blocked by dirt, you should check the pump body and clean the dirt.
If the height of water conveyance exceeds the regulations too much, the pump head should be adjusted to the specified range.