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Hello HarryTry resetting and re-pairing - see the attached manual page.
In that case, regretfully, I think you're looking at a new unit.IMHO it's unwise to replace just one of the pair. The software might well not be fully compatible, and you'd have no in-warranty support. And you might even struggle to find one of the pair without the other. Go for a new matching set.
You're welcome.This might also be an opportunity for you to invest in an Internet-enabled product ;-)