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I know this is an old post, but I have a similar issue.
CCU flickers on/off and the recirc light quickly blinks once. From my other post you will see that I am very frustrated. This is for a 97 W210. Any thoughts on what it means, there are no fault codes on the unit.
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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)
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