01273- Fresh Air Blower (V2) 02023- Supply Voltage for control. module for fresh air blower lower limit exceeded. 01844- control module for fresh air blower J126. i did search a lot of posts about this issue and the common faults of these codes are caused by faulty fan motor and blower resistor. Read out the error memory. Check the parameter for the pressure sensor via the measured value blocks (the parameter should be around 5 bar when the air-conditioning system is filled and switched off) Check the control of the sensor and fan as necessary. The most common causes for AC fan blower motor not working in Audi A6 are blown fuse, bad relay, resistor or control module malfunction and faulty blower motor. However, a bad electrical connector or broken wire, or a defect in the climate control unit can also cause the blower motor to stop working. 1. Blown fuse HOW TO FIX COOLANT SYSTEM FAULT/NO AC /FAN NOT WORKING/AUDI A6 Hey guys, in this video I demonstrated HOW TO FIX COOLANT SYSTEM FAULT,NO AC ,FAN NOT WORKING, on 2012 AUDI A6 02071 Audi A6 with no heater blower. I walk through my diagnostic thought process on this A6 logging 02071 communication fault with no heater blower more. If the interior blower fails on the vehicles mentioned above, the cause may be a faulty pressure sensor in the air-conditioning system. The blower output stage and the pressure sensor (see figure) use a shared signal line to communicate with the control units (Climatronic). KeN5CIQ.