I don't have a fireplace, but from what I've read on here, there is a switch on the panel that allows you to decide if you want the electric water heater or fireplace. It must be in the fireplace position for it to work.
Did you connect the dish to the satellite connection outside? If so did you connect a cable from the satellite connector inside to the receiver? If so, it should work. If you don't have a dedicated satellite connection from the outside in, you have to disconnect the antenna amplifier for the satellite to work.
2013 Silverado 2500HD LTZ CC 6.6L Duramax Diesel
2014 Sunset Trail SF270BH
Holly & Buster, mini Dachshunds
2016: 1 trip, 3 nights in 1 state, 316 miles
2015: 5 trips, 18 nights in 3 states, 2707 miles
2014: 5 trips, 14 nights in 3 states, 2426 miles