Technical data

List of Contents Thermo 230 / 231 / 300 / 301 / 350
II
5. Troubleshooting
5.1 General ................................................................................................................................................. 501
5.2 General Fault Symptoms ...................................................................................................................... 501
5.3 Fault Symptoms during Functional Checkouts and Error Code Output or Tests with
Diagnostic Computer, Components Tester or PC Heater Diagnosis .................................................... 503
5.3.1 General...................................................................................................................................... 503
5.3.2 Fault Symptoms......................................................................................................................... 504
6. Functional Checkouts
6.1 General ................................................................................................................................................. 601
6.2 Adjustments .......................................................................................................................................... 601
6.2.1 Adjustment of CO
2
Contents ..................................................................................................... 601
6.3 Components Testing............................................................................................................................. 602
6.3.1 Temperature Sensor Resistance Check.................................................................................... 602
6.3.2 Flame Sensor Resistance Check .............................................................................................. 602
6.3.3 Igniter Electrodes Check ........................................................................................................... 602
6.3.4 Igniter Box Check ...................................................................................................................... 603
6.3.5 Fuel Pump Check ...................................................................................................................... 603
6.3.6 Fan Motor Check ....................................................................................................................... 604
6.3.7 Solenoid Valve Check ............................................................................................................... 604
6.3.8 Nozzle Block Preheater Check.................................................................................................. 604
7. Circuit Diagrams
7.1 General ................................................................................................................................................. 701
8. Servicing
8.1 General ................................................................................................................................................. 801
8.2 Heater Servicing ................................................................................................................................... 801
8.3 Vehicle Servicing .................................................................................................................................. 801
8.4 Heater Test Run.................................................................................................................................... 801
8.5 Maintenance ......................................................................................................................................... 801
8.5.1 Inspection and Attachment of the Exhaust Muffler (only heaters from year of
production 1996 and up to production date 1996, calendar week 36; 3G......) .......................... 801
8.5.2 Burner Head Opening and Closing or Removal and Installation ............................................... 803
8.6 Visual Inspections and Regulations for Installation............................................................................... 804
8.6.1 Connection to Vehicle Cooling System ..................................................................................... 804
8.6.2 Connection to Vehicle Fuel System........................................................................................... 804
8.6.3 Combustion Air Supply .............................................................................................................. 806
8.6.4 Exhaust Line.............................................................................................................................. 806
8.7 Removal and Installation....................................................................................................................... 807
8.7.1 Heater, Removal and Installation .............................................................................................. 807
8.7.2 Temperature Limiter, Replacement ........................................................................................... 807
8.7.3 Temperature Sensor, Replacement .......................................................................................... 807
8.7.4 Burner, Replacement................................................................................................................. 807