6 720 680 174 (2014/05)
Therm 8000S
Maintenance | 37
9
Maintenance
To ensure that gas consumption and the environmental load
(pollution, etc.) remain as negligible as possible over a longer
period of time, we recommend that you assure to have the
appliance maintained on an annual basis (inspection) or if
necessary (maintenance).
▶ Your appliance must only be serviced by a Bosch Technical
Assistance delegate.
▶ Use only genuine accessories.
▶ Order accessories according to the list of accessories
provided with the appliance.
▶ Substitute dismantled joints and o-rings with new ones.
▶ Only the following lubricants must be used:
– On hydraulic parts: Unisilikon L 641 (8 709 918 413)
– Threaded joints: HFt 1 v 5 (8 709 918 010).
9.1 Periodic maintenance tasks
Functional checks
▶ Ensure that all safety, regulatory and checking elements are
in good working order.
Heat exchanger
▶ Inspect the heat exchanger.
▶ If it is dirty:
– Dismantle the chamber and remove the regulator.
– Clean the chamber with a pressurized water jet.
▶ If the dirt resists: soak soiled parts in hot water with
detergent and clean carefully.
▶ If necessary: de-scale the interior of the heat exchanger and
connection tubes.
▶ Reassemble the heat exchanger using new joints.
▶ Remount the regulator on its support.
Burner
▶ Inspect the burner annually and clean as necessary.
▶ Check the burner through the observation window if there
are liquids or fissures.
▶ Verify if the flame is stable and blue without signs of yellow
flames.
▶ Verify CO
2
levels (see chapter 8.3) and correct it if
necessary.
Water filter
▶ Close the water inlet supply valve.
▶ Clean the water filter, see Fig. 55 .
Fig. 55
[1] Water filter
Your appliance must only be serviced by a
qualified technician.
DANGER:
Electrical discharge!
▶ Always disconnect the electrical current
(fuse, safety power switch) before
working on the electrical installation.
WARNING:
Burner damage!
The burner surface is very fragile.
▶ Do not touch the burner surface, take
extra caution during the maintenance
operations!
Yellow burner flames are an indication of
improper combustion. Assure that the
installation of the exhaustion conduct and
of admission of air fulfil the manufacturer's
requirements.
