It is possible the sat signal is not passing thru the meter to the receiver.
If your satellite meter is powered by it's own battery, connect a short piece of RG coax from the LNB to your meter.
Connect the main satellite cable from the receiver, direct to a 2nd output on that LNB.
As a Bell & Shaw installer, I agree with the other comments. When the LNB is connected to a receiver, AND NOT PROPERLY AIMED, you will still see a signal reading of 15 - 20. This indicates a physical electrical connection has been made between the LNB and receiver.