Valeo Thermo E+ 120, Workshop Manual, Page: 36 / 65

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Thermo E+ 120/200/320 5 Troubleshooting
5.6.5 Fan, hood 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 circlip for proper fit.
• Inspect hood inside and outside for damage and dirt
deposits.
• Install hood (see 8.4 ).
5.6.6 Burner motor inspection
For burner motor description, see 3.1.1 .
Inspection without use of DTT diagnosis
Measure optical the motor speed with an external measu-
ring device. For that:
• Affix a reflector onto the fan wheel.
• Apply 24V (12V) DC.
• Measure the motor speed during initial cycle, ignition,
heating operation or purge cycle.
• Compare the measurement result with the nominal
speed shown on the motor label. Deviations of 10%
are permitted.
• If the speed is not as required:
• Remove hood (see 8.4 ).
• Check whether the proper motor is installed
(heating capacity class, operating voltage of the
heater).
• If required replace burner motor (see 8.5 ).
• Reinstall burner (see 8.2 ).
Inspection using the DTT diagnosis
• Disconnect the heater from the vehicle electrical
system (
Observe 5.2 !).
• Inspect the motor for bearing conditions (stiffness).
• Connect the DTT diagnosis to the heater using the
adapter wiring harness (ref. to Operating Instructions
for the DTT diagnosis).
• Reconnect the heater with the vehicle electrical
system.
• Start DTT diagnosis, establish connection to the
heater and open the Component Test menu.
• In the Component Test menu, select the motor and
proceed according to the DTT diagnosis instructions.
Enter run time and start the component test.
• Measure optical the speed with an external measuring
device. For that:
• Affix a reflector onto the fan wheel.
• Compare the measurement result with the nominal
speed shown on the motor label. Deviations of 10%
are permitted.
• If the speed is not as required:
• Remove hood (see 8.4 ).
• Check whether the proper motor is installed
(heating capacity class, operating voltage of the
heater).
• If required replace burner motor (see 8.5 ).
• After test completion, terminate DTT diagnosis as
needed.
• Disconnect the heater from the vehicle electrical
system (
Observe 5.2 ).
• Remove the DTT diagnosis adapter wiring harness as
required.
• Reconnect the heater to the vehicle electrical system.
Fig.505
Hood
Circlip
Fan wheel