511
Thermo E+ 120/200/320
5 Troubleshooting
5.6
Individual component tests
Individual components can basically be tested using
visual inspection, manual electrical testing or test by
means of the DTT diagnosis.
The following section provides information on the scope of
tests and how to carry out the individual component tests.
NOTE:
Prior to disconnecting the temperature sensor plug
connection, disconnect the heater from the vehicle elec-
trical system (
Observe
!
).
5.6.1 General visual inspection
•
Inspect components for damages (cracks, deforma-
tion, leaks, discolourations, etc.) and replace as
needed.
•
Inspect plugs and cables for corrosion, contact and
crimp errors and repair as needed.
•
Check plug contacts for corrosion and tight fit. Repair
as needed.
5.6.2 Heat exchanger visual inspection
For heat exchanger description, see
.
•
Inspect heat exchanger interior for damage, corro-
sion, sooting and deposits.
•
Inspect heat exchanger for outer damage, corrosion,
moisture, deformations, deposits, discolourations,
etc.
ATTENTION:
Soot and deposits in the heat exchanger must be
removed, as they impact the heat transfer to the
coolant. The exhaust gas temperature can rise
sharply and components in the burner can be
damaged by heat.
Severe outer deformations may impact coolant flow.
5.6.2.1 Visual inspection of exhaust outlet and
exhaust line
Inspect exhaust outlet and possibly available exhaust line
for conditions, tight fit, contamination and deposits.
Use only exhaust gas applications according to Installa-
tion instruction.
5.6.3 Combustion chamber visual inspection
For combustion chamber description, see
•
Remove combustion chamber (see
).
•
Inspect swirl plate and combustion chamber head for
damage and tight fit.
•
Check combustion chamber for scalings and coke
deposits and remove as needed.
•
Inspect combustion chamber for deformation and
moisture.
•
Inspect combustion chamber for cracks.
NOTE:
Cracks in longitudinal direction at the end of the
welding seam shorter than 80 mm (E+ 200/320) and
20mm (E+ 120) are permissible.
Combustion chamber Thermo E+ 120 only:
•
The insulation of the combustion chamber must be
checked for condition, damage and correct seating.
It must not be soaked with fuel.
•
After the inspection is completed, reinstall the
combustion chamber (see
).
Fig.501
CC E+ 200/320
CC E+ 120
Summary of Contents for Thermo E+ 120
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