A SERVICE OF

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5TROUBLESHOOTING
T
HERMO
90 / 90 S
5-4
5.5 Visual Inspection for Assessment
of Burner Condition
Burner and evaporator have specific features indicating
their need for replacement or their serviceable condition.
The following describes the criteria for a correct
inspection.
5.5.1 Burner Housing
The starting air bore (Fig. 5-3) must not be clogged,
otherwise there will be no start.
Remedy
Carefully remove any contamination with a wire
of 1.5 mm diameter. Remove glow pin first.
Fig. 5-3 Visual Inspection, Burner Rear Wall
1 Fuel Inlet Pipe
2 O-ring
3 Flame Sensor
4 Insulation
5 Glow Pin
6 Housing
7 Screw
8 Bracket
9 Starting Air Bore