Webasto Air Top 2000 D Service And Repair Manual page 3

List of Contents
5. Troubleshooting
5.1 General....................................................................................................................................................501
5.2 General Failure Symptoms......................................................................................................................501
5.3 Failure Symptoms during Operation........................................................................................................502
5.4 Error Code Output (Air Top 2000 Diagnosis) ..........................................................................................503
6. Functional Tests
6.1 General....................................................................................................................................................601
6.2 Adjustments.............................................................................................................................................601
6.2.1 Adjustment of the CO
6.3 Components Testing ...............................................................................................................................602
6.3.1 Glow Plug Resistance Test .........................................................................................................602
6.3.2 Flame Sensor Resistance Test ...................................................................................................602
7. Circuit Diagrams
7.1 General....................................................................................................................................................701
8. Servicing
8.1 General....................................................................................................................................................801
8.2 Work on the Air Heater ............................................................................................................................801
8.3 Work on the Vehicle ................................................................................................................................801
8.4 Air Heater Test Run.................................................................................................................................801
8.5 Servicing..................................................................................................................................................801
8.6 Visual Inspections and Installation Regulations ......................................................................................801
8.6.1 Heating Air System......................................................................................................................801
8.6.2 Fuel Supply .................................................................................................................................802
8.6.3 Dosing Pump...............................................................................................................................804
8.6.4 Fuel Filter ....................................................................................................................................804
8.6.5 Combustion Air Supply................................................................................................................805
8.6.6 Exhaust Line ...............................................................................................................................805
8.6.7 Combustion Air Intake and Exhaust Lines ..................................................................................805
8.6.8 Electrical Connections.................................................................................................................806
8.7 Removal and Installation .........................................................................................................................808
8.7.1 Air Heater, Removal and Installation...........................................................................................808
8.7.2 Replacement of Control Unit .......................................................................................................808
8.7.3 Replacement of Temperature Limiter..........................................................................................808
8.8 Installation of new Control Units ..............................................................................................................811
8.8.1 Replacement of Control Unit Air Top 2000 (12 Volt)
with External Temperature Sensor..............................................................................................811
8.8.2 Replacement of Control Unit Air Top 2000 (24 Volt) not TRS.....................................................811
8.8.3 Replacement of Control Unit Air Top 2000 (24 Volt) TRS...........................................................812
8.9 First Operation.........................................................................................................................................812
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Contents.................................................................................................601
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Air Top 2000