8 Service work Thermo 90 S / Thermo 90 ST
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8.4 Heater trial run
The heater must not be operated in enclosed areas such
as garages and workshops without an emissions
extraction system, even if you use the timer.
8.5 Service work
The following service work is to be carried out after or
before each heating period to maintain the functional
reliability of the heater:
• Clean the exterior of the heater (avoid the ingress of
water).
• Check the electrical connections for contact corrosion
and to ensure that they are secure.
• Check the exhaust and combustion air lines for signs
of damage and to ensure that they are clear.
• Check the fuel line and filter for leaks.
• Check the coolant circuit and circulating pump for
leaks.
• Inspect hoses for cracks.
• Replace the fuel filter if there is one.
