Fig. 46: O-ring at the back of the combustion tube
8. Pull off the O-ring (3) and put a new one on (Part No. 70380).
The O-ring should be at a distance of approx. 2 cm from the end of the tube.
9. Install the dust box again, see “Installing the dust box”.
10. Put the furnace locking device back on, see “Inserting the combustion tube”.
The O-rings have been replaced.
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