As per @Richw1982 - this test is unreliable and often fails on perfectly working systems, mine included.
What's the service issue you're having?
Edit: Please don't create duplicate posts, it causes confusion with different posters responding. I've merged them together. I'd suggest following the advice on https://www.virginmedia.com/help/virgin-tv-error-codes/v217 as a starter for six.
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