19
Maintenance
Pilot Ignition – 6 720 886 398 (2021/02)
8
Maintenance
To ensure ongoing performance and safety, we require the
appliance be serviced every two years.
▶ Only use original replacement parts.
DANGER:
Failure to perform maintenance procedures
can lead to appliance malfunction, errors,
service calls and loss of manufacturers
warranty.
Maintenance must only be performed by a
qualified technician. Maintenance
information is contained in a service manual
available to licenced technicians upon
request from Bosch.
Service checklist
Done
1.
Water Valve
1.1 Diaphragm, replace if required.
1.2 Water throttle, greased, O-ring replaced if
required.
1.3 Water filter, cleaned, replace if required.
1.4 Gland oring, greased, replace if required.
1.5 Water governor, replace if required.
1.6 Slow ignition, cleaned.
2.
Gas Valve
2.1 Pilot burner, cleaned.
2.2 Main burner, injectors and venturies cleaned.
2.3 Control buttons, greased.
2.4 Piezo ignitor, greased.
3.
Heat Exchanger
3.1 Fins cleaned.
3.2 Water connections tightened.
4.
Gas pressure
4.1 Burner pressures checked and adjusted.
Table 11 Service checklist
Summary of Contents for TF250
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