They'll activate it. But if a service technician sees one, he's supposed to replace it with something besides an H20-600.
had my second deffective h20 replaced, this time 9-22-10 they sent a tech out.
You guessed it I got another one, tech said they couldn't replace rec with anything less than what I had.
If I would have had a 23 then they could give me a 23 or a 24 , but not 22s, 21s or 20s, he said he had a "new" h-20 on truck, if he had not had had it he could have given me a latter model.
The tech did a great job, was very understanding, but he had to follow his directives, so there is no rap on the tech at all.
Maybe next time I'll get lucky.