Blower always on

strange problem here , went to work and everything was fine, jumped in the car and turned on the ignition and the heater blower stayed on full........ any way for a quick fix or is it a new unit needed

update on this..... i have removed the unit from the dashboard and the blower still stays on full , have now pulled the fuse to stop blower

Check these guys out they helped me www.worldofrover.co.uk

problem was solved........... loose wiring loom under the dash in the passenger footwell