My indesit IS70C condenser dryer is tripping the ELCB intermittently?

My indesit IS70C condenser dryer is tripping the ELCB intermittently, the cause seems to be water lodging below both the fan and the heating element. what could be causing the water to lodge here?.In response to the answers received- both the pump and the float appear to be working as water is being collected in the water collection drawer, but some water is also lodging below the fan and element.