New climate control blinks, suggestions?

[MWS]

Sorry if any just read "what you don't want to have happen", but I thought I would post this issue separately to see if this is common.

I had a climate control unit replaced by Porsche, new unit has a strange issue... it constantly blinks on startup (about nine blinks) then ok. At next startup, same thing. They suggested the unit might be "coding" to car, and I should drive a few days and let them know. Everything works, it's just odd. They tested it many times at shop, and also checked voltage on inputs and looked for any errors...all ok.

Car is '01 2.7, unit is remanufactured by Porsche.

Is this common, or should I let them know I want a replacement? FYI, it took almost 2 months to get this one.

Thanks in advance, and happy driving.