If you are successful the pump motor will rotate and the pump will start to spin, you have identified a strong screw- driver maybe required for this task. Failing this a new pump maybe your only option.
Put the slider on the EP2002 to continuous, ensure the room thermostat is calling for heat (if fitted) Place a large screw drive against the pump motor and your ear, can you ear the motor spinning round or is there just a dull buzzing noise, if the later is the case, the pump motor is probably...