Audi A6 - Interior blower not working | HELLA

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). If the sensor fails, communication is disrupted and the blower is no longer activated. The error code 2071 is then stored in the error memory.

If the blower fails, diagnostics should be carried out as follows:

• Check fuses
• 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