help with a 3-way!

[Carl G]

I have a TC Electronics BH800 which I bought from a fellow Basschatter some time ago - lovely amp, does everything that I need and sounds awesome. I have just moved house, though, and upon setting up and trying the 3-way pedal switch to move between the stored tone prints the pedal didn't work - it muted but that is all. I tried a new pedal and had the same again. Can anyone help with this - I don't use it very often but it is a niggle that I could do without. Thanks