8 Servicing Thermo 90
802
8.4 Heater Test Run
WARNING
The heater must not be operated, not even with timer, in
en
closed areas like garages or workshops not equipped
with an exhaust venting facility.
8.5 Servicing
Before or after each heating season the following
servicing should be performed to maintain the heater's
functional reliability:
• Clean heater exterior (prevent the ingress of water).
• Examine electrical connections for corrosion of
c
ontacts and for security.
• Check exhaust combustion air lines for damage and
for
foreign matter and contamination.
• Check fuel lines and fuel filter for leakage.
• Check coolant circuit and circulation pump for
le
akage.
• Check hoses for cracks.
• Replace fuel filter if installed.
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