@Weesophxx
The broadband check looks for faults outside of your property and in you area so for issues in your home it will not pick anything up as you have discovered.
As for the signal issues try going through this to see if it helps:
https://www.sky.com/help/broadband/my-broadband-speed/improving-wi-fi-signal-to-my-devices/articles/...
If not and if you have Wi-Fi Max on your account then Sky will supply up to 3 pods as you can read about here:
https://www.sky.com/help/articles/sky-wifi-max
Select "No, I still need help" at the bottom on the above link.
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