Webasto thermo top evo Workshop Manual page 30

5 Troubleshooting
Fault Component
Control unit
15
(fault memory)
Coolant
16 changeover
valve
514
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Recommended workshop action
Read out fault memory with Webasto Thermo Test
PC Diagnosis, then print out and clear fault memory
Include printed fault log when sending heater to
Webasto.
Complete replacement of fan unit if control unit is
defective.
Check continuity from connector X1 Pin 4 to connec-
tor X15.
Check continuity from connector X15 (brown wire)
against earth.
Apply 12 V voltage to connector X1, Pin 4
Fig. 504 Overview of functional test of heater and its components
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Thermo Top Evo
Parameter
Valve switches audibly