Fault Code 30

Fault Code 30

AC - Signal Unclear

Diagnostic conditions

NOTE:
This fault can be determined only during a system test.
- Perform system test

Possible cause of fault
- Fuse D 6 faulty
- Fuse C 7 faulty
- Refrigerant pressure too low or non-existent
- Line fault between pressure switch, relay for fresh-air blower, relay for magnetic clutch, DME control module or air-conditioning compressor
- Pressure switch faulty
- Relay for magnetic clutch faulty
- Relay for fresh-air blower faulty
- Magnetic coupling faulty
- Air-conditioning system regulator faulty

Affected pins
Plug B, pin 16

Diagnosis/troubleshooting

Work Instruction 1 - 5:

Work Instruction 6 - 8:

Work Instruction 9 - 13:

Work Instruction 14 - 24:

NOTE: After troubleshooting, a system test must be carried out.