Removing The Outer Case; Primary Sensor; Overheat Thermostat; Flue Overheat Thermostat (With Grommet) - Bosch Condens 5000W Installation And Maintenance Instructions Manual

6.8.1

Removing the outer case

1. Undo the two screws securing the top of the boiler casing.
2. Undo the two screws securing the bottom of the boiler casing.
▶ Pull case forward and remove.
– To remove bottom tray, pull forward on the tag on the underside of
the tray.
1.
1.
2.
Fig. 80 Remove outer case
To gain access to the following components the outer case has to be
removed:

▶ Primary sensor

▶ Overheat thermostat

▶ Flue limit thermostat
6.8.2 Primary sensor
Refer to figure 81 for removal.
1. Remove electrical connection by pulling upwards.
Squeeze retaining clip on plastic moulding of sensor and pull back
and up until clear of pocket in heat exchanger.
2. Pull forward to remove completely.
▶ Coat new sensor with heat conductive paste and replace.
6.8.3 Overheat thermostat
Refer to figure 81 for removal.
▶ Remove two electrical connectors from thermostat.
3. Slacken and remove fixing screw and thermostat [3].
▶ When replacing ensure thermostat sits correctly on surface of the
casting with the left hand side of thermostat sitting up against the
shoulder.
Bosch Condens 5000W – 6 720 646 195 (2018/10)
It is essential that the mating surface of the thermostat is coated with
heat conductive paste.
1.
Fig. 81 Primary sensor and overheat thermostat
6.8.4

Flue overheat thermostat (with grommet)

To remove and replace the thermostat either:
▶ Using a small terminal screwdriver, prise the thermostat and
grommet from the plastic housing. Take care not to damage the
grommet or plastic housing.
2.
-or-
Refer to figure 82.
1. Release the flue connection from the sump.
2. Push the flue tube up.
1.
Fig. 82 Lower exhaust section
Servicing and spares
3.
2.
2.
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