How do I fix my hot water tank?

This is a tricky one karen but i think this is the pump that has been fitted the wrong way round and the boiler thermostat when on central heating is sensing the return water temperature instead of the flow temperature causing it to overheat.does your pump run when on hot water only or is it gravity hot water supply to your tank if it is gravity im sure this is the problem

stevie w
October 2008