512
Thermo plus 160/230/300/350 5 Troubleshooting
5.6.5 Fan and combustion air intake line visual
inspection
• Inspect a possibly available combustion air intake line
for contamination, condition and deposits.
• Remove hood (see 8.4).
• Inspect fan channels for contamination and deposits.
• Inspect fan and motor shaft mount for cracks, stress
marks and deformations.
• Check cover plate for tight fit.
• Check circlip for proper fit.
• Install hood (see 8.4).
5.6.6 Burner motor inspection
NOTE:
It is possible to test the burner motor using the Compo-
nent Test menu of the STT diagnosis.
Inspection using the STT diagnosis
• Disconnect the heater from the vehicle electrical
system (Observe 5.2 !).
• Connect the test plug instead of the temperature
sensor plug to the control device.
Reconnect the heater with the vehicle electrical
system.
• Connect the STT diagnosis to the heater.
• Start STT diagnosis, establish connection to the
heater and open the Component Test menu.
• Select the motor in the Component Test menu.
Enter target speed and runtime. Next start the com-
ponent test.
• Compare the real motor speed with the target motor
speed given by the STT diagnosis.
• After the test is completed, exit STT diagnosis as
needed.
• Disconnect the heater from the vehicle electrical
system.
• Disconnect the test plug and reconnect the tempera-
ture sensor plug.
• Reconnect the heater to the vehicle electrical system.
Fig. 505
Hood
Circlip
Fan wheel
Fig. 506
Burner motor
Fan wheel
(displayed transparently)
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