Thermo Top Evo 5 Troubleshooting
513
9
Circulating
pump
Conduct component test to check function of circu-
lating pump with Webasto Thermo Test PC Diagno-
sis.
Touch with hand; pump
functions if slight vibration
can be felt
Measure resistance on circulating pump connector
X4, also see Section 8.2
10 ± 1 kohms
Check pump for leaks
Check self-venting installation position, also see
Section 8.3 or general installation instructions
10 Fuel connection
Are bubbles visible in the fuel line/are bubbles
pumped during feed rate test (see Point 5)?
If they are, then change connection or routing of
line.
Check integration in vehicle fuel system.
Observe fuel level (no reserve); is fuel tank extraction
correct?
Inspect fuel lines for leaks, kinking or clogging.
11 Coolant circuit
Check integration in coolant circuit of motor vehicle
in accordance with general installation instructions/
vehicle-specific installation instructions
Check whether coolant circuit is correctly bled
Check circulation in coolant circuit
Eliminate kinks and rubbing spots
Check leaks on heater, water connection piece, cir-
culating pump and hoses and eliminate
12
Exhaust system
and intake air
system
Check whether intake pipe and exhaust pipe are
routed in accordance with general installation
instructions/vehicle-specific installation instructions
Check whether lines are not insulated/are clogged
Eliminate existing leaks on intake pipe and exhaust
pipe (no CO
2
in intake air)
Check whether sufficient distance is present to pas-
senger compartment fresh-air intake of vehicle
13 Vehicle fan
Check switching signal on relay K1, Pin 86 (also see
wiring diagram in general installation instructions/
vehicle-specific installation instructions)
Observe coolant temperature (K1 switches at
approx. 50 °C)
Check flap position of vehicle heater (air condition-
ing set to HI)
14
Control unit/
heater locked
Unlock in accordance with Section 5.1.3
Fault Component Recommended workshop action Parameter
Fig. 504 Overview of functional test of heater and its components
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