Heater Component - Webasto Air Top Evo 3900 Workshop Manual

Function Tests

6.4.7 Heater component

Complete heater
Testing of all electrical
components
Glow plug:
Resistance outside
0.190 - 0.250 ohms (12 V)
0.740 - 0.940 ohms (24 V)?
yes
Drive unit:
Resistance outside
0 -6 ohms?
yes
2
Overheating sensor
Resistance outside
2 - 2.5 kohms?
yes
Installation of component
in unit => short circuit to metal
parts (heat exchanger etc.)?
yes
All tested electrical
components are OK
B
610
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Description
Remove upper shell from
heater and pull component
connector off control unit
PCB. Wire colours of
individual components:
Glow plug (yellow),
Flame monitor (brown),
Drive unit (black/red),
Overheating protection
(white)
no
Replace component and
3
continue
no
Replace component and
3
continue
no
Replace component and
3
continue
no
Replace component and
3
continue
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Air Top Evo 3900/5500
Procedure Testing and
measuring
equipment
Resistance Digital
measurement multimeter
Resistance Digital
measurement multimeter
Resistance Digital
measurement multimeter
Continuity Digital
measurement multimeter