You don't even say what pedals you have or what amp. Pretty hard to help.
That said, if you have 'Factors, try playing with the line switches as described in the manual. Also, make sure that your guitar is turned up.
Any (and I mean any) digital unit can be noisy if the various gain settings are wrong – you may need some help setting up.
If one pedal is noisy, it may be faulty, but probably not all of them.