Hotpoint tcl770 dryer lights and cuts out?

I have hotpoint tcl dryer. The light on empty water container is flashing upon turning on and beeps constant after 2/3 mins it stops and have to press start again for it to do it again. I have cleaned all filters, I have even had back off and cleaned all filters front to back. I have checked water pipe to container all ok. There is heat no probs there. The water pump seems to be making a grinding noise and not much water is being dispensed into container but clothes are drying eventually.
any ideas to my problem?