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Do you have any issues with your Climatronic? Can you go into the cluster, and look at the data blocks from 120 or so and see if the Climatronic is showing as actively communicating?
I would check the heater- the communication error could be anything that is on that Comfort CAN-BUS- so any module that is dead could be blocking part of the signals. I would suggest trying to look at the data blocks in the cluster, since that is the main Gateway, and see if there are any other modules that are not communicating, scroll upward from data block 120, you should get the TCM, Comfort module, radio, etc. Look at the modules that are part of the Comfort system (the Phaeton has WAY TOO MANY modules!)
Yeah, they were way too complicated for their time. We used to replace modules of every type in them all the time.