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• Backfire in the feed tube: Although the feed screw is emptied during a feed
screw overheating alarm,
a backfire might reach the feed tube for some reason.
The logic display shows an alarm [FEED SCREW OVERHEATED!] figure 31 and
the feed tube feels hot or has become black and the water container should also
be empty.
Drive fuel to the combustion chamber of the boiler using the screw
manual operating switch until new
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