Buderus 600 - 11S Installation And Servicing Instructions page 49

Servicing
5.3.8 Checking the miniature fuses
Disconnect the system from the power supply.
Loosen crosshead screw on UBA housing.
Swivel UBA housing downwards.
Open the UBA housing.
Check miniature fuses (fig. 64) for correct functioning,
or carry out visual inspection. If defective, fit new fuse.
All fuses a rated 230 Vac - 1.25 AT.
Fuse Function
1 Hot surface ignitor
2 UBA, sensors, thermostat valve
3 UBA, three-way valve
Shut the UBA housing.
Swivel the UBA housing upwards and screw into place.
Connect system to mains power supply.
5.3.9 Checking the pump
Remove screw plug on the pump (fig. 65).
Turn the UBA mains power switch to "I".
Check to ensure that the pump is running. The pump's
running mechanism may become blocked if the heating
system has been out of use for an extended period.
Use a screwdriver to rotate the pump in its normal running
direction and release the blockage in question. If this
procedure does not work, replace the pump.
If the pump is working correctly, screw the plug back in.
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 05/2004
Fig. 64 Checking the miniature fuse
Fig. 65 600 - 11S / 19S / 24S / 24C:
checking the pump
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
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