[zoombini]

I take it that you are using the RF cables to connect them both.
If so, they are both on the same RF channel & one needs moving.

Have you tried using the SCART lead & the AV channel to record from the STB? This should work without the problem until you can get the STB RF channel changed?

Perhaps someone will advise if this is a cheargeable visit.

Or if you or someone you know is confident enough to chnage the channel on it after following some instructions then someone here can proberably tell you how if you can let us know your STB model number.