The pedal its self might not be well shielded. It is very common to have to move your rig around to find a quiet spot in your house. Large appliances can do it as well as wiring in the wall. It is probably cheaper to move your stuff than have an electrician in to try to shield everything. UGB will be able to give you some practical tips. My amp used to pick up a Russian
radio station till I moved it to the other side of the room.