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2
1
3.
Expose the clean-out cover by pulling out the remaining thermal
insulation (Fig. 11).
3
4.
Visually check whether the clean-out cover has any leaks
(Fig. 12). The cover must be fl ush with all the edges and
the seal must not be visible. When you are satisfi ed with
the tightness of the cleaning cover, reposition the thermal
insulation correctly. Then close the boiler casing. After this,
you can switch the boiler on again.
Data subject to change without notice | BTC 410004103 C | 01.2020
GB125/35 Field Action - Safety Rework Instructions
5.
If the cover seal is not OK (Fig. 13), it must be replaced.
Figure 10
Figure 11
Figure 12
6.
You will need the old clean-out cover, a new seal, a tube of
silicone adhesive. The individual steps are explained on the
following pages.
3 of 5
BAD COVER SEAL EXAMPLES
Ensure the correct combination of components is used.
This depends on the version of the cleaning cover.
Bosch Thermotechnology Corp.
Figure 13
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