W210 AC DTC codes
 

My 99 E300 has intermittent blower malfunctions where occasionally the interior fan does not come on. Most of the time it works just fine. Malfunction has occurred in winter and summer with climate control set on AC or EC. AC and heat both work fine but at times there is no fan to push the air out. Display (on very cold or hot days) goes to Hi fan speed and stays there with no air coming out.

I can sometimes turn fan speed down manually and turn unit off, then restart car, engage AUTO and have the fan come on. At times not.

Climate control DTC codes are:
eb1234
eb1459
ebFF (finished?)

Doing SteveBFl's vent test I get #1-15 and can then toggle low and hi for each; fan never changes speed. I can hear the vents opening and shutting.

how is the cabin filter? i run into fan problems due to very
dirty filters.

I will check the filters.

Can anyone comment on the error codes?