even after empying the collection bottle when the start button is pressed the orange light comes on and prevents the dryer from working.

Lee., November 2009

There is another potential cause for this problem.
If the valve for the water tank fails, it can cause the same symptoms. This is because the centre of the valve in the tank needs to push open the corresponding valve in the machine itself. This means that even if you try all of the previous solutions it will work long enough to fill up the float chamber and will then shut off. When you take out the water tank and it's empty take a look at the water tank.

Rhythm Addict, May 2014

Followed LockJaws instructions and it solved the problem. It seems that excess water collects in the chamber causing the foam black "T" to rise and trip the cut out switch.
That is why Meezfixesthings solution worked as well because the water emptied from the chamber and lowered the trip switch.
Will post photos when I work out how.

ferretpants, February 2010

Unplug machine, remove top by taking out 2 screws at back, remove left hand side panel as viewed from front by taking out 4 screws on back left (starting from bottom) and one screw on top left (need top off to gain access). When panel is removed the float chamber is exposed at bottom left when viewing from removed side panel. Remove single keep screw then slide plastic float switch assembly towards you. In the tray is a polystyrene 'T' shaped float. Remove this and clean. Then replace everything in order. 15 minute job.

Lockjaw, January 2010

We had the same problem with ours, but I fixed it.
This is what I did.
First, disconnect the power - essential!
I removed and emptied the reservoir and condenser and cleaned them and ALL of the filters thoroughly - dont replace them yet.
Second, get a big towel, a mop and bucket and then tip the dryer on it's side.
On the underside is a grey pipe with a jubilee type clip, undo the clip and clear out any gunk! By now there will be a puddle on the floor.
On the back of the dryer is a small white cap, with another clip, undo this and again clear out any gunk, replace both the pipe and the cap.
Tip the dryer on its other side and some more water should leak out.
By now the puddle should have grown - I got another pint or two out doing this, so I recommend mopping the worst of it up.
It seems that overloading the dryer creates too much moisture that the system can't eject it fast enough so it builds up, I believe that most of it gets caught in a pump/well at the front of the machine, at the bottom. If you open the bottom of the two doors on the front and slide your hand in at the right, you can feel the blades of the pump - this seems to be where most of the water gets stuck. So even if you empty the water bottle - the actual water ejection system (pump and piping) is still loaded with water and hence the light stays on. By tipping the machine and clearing out all blockages, you can get the excess water out.
Now, replace the condenser and water bottle, the clips if you haven't already and the filters. Turn the machine back on (with no washing in it) - and hopefully it'll spring back into life.
Run the machine empty for half an hour to clear any more moisture left in the machine whilst cleaning up the puddle that now occupies your floor.
My advice - don't get me to do your drying - since I tend to overload the machine and clean it once in a while.
Hope this helps someone else.

MeezFixesFings, November 2009