Troubleshooting
3
Subject to modifications resulting from technical improvements!
Buderus Ltd. • http://www.buderus-domestic.co.uk
50
Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006
3.1.7
Checking the air intake and outlet openings
z
Check to ensure that the air intake and outlet openings are
of sufficient size, and that they are not obstructed or
clogged.
3.1.8
Replacing the UBA
z
Disconnect the system from the power supply.
z
Loosen crosshead screw (fig. 51, item 1) on UBA housing.
z
Swivel UBA housing downwards.
z
Open the UBA housing (fig. 52).
z
Note the position of the cable plugs, disconnect all cable
plugs.
z
Open the mains connection box by loosening the screw.
z
Loosen the four screws and remove the strain-relief clamp.
z
Carefully lift the UBA and remove by pulling forwards (snap
lock) (fig. 53).
z
Fit new UBA.
z
Reconnect all plug-in cables to their correct sockets.
z
Feed the mains lead in through the strain-relief clamp in the
connection box and connect to the terminals as per the
wiring diagram.
z
Retighten the strain-relief clamp and shut the connection
box.
z
Shut the mains connection box.
z
Shut the UBA housing.
z
Swivel the UBA housing upwards and screw into place.
z
Fit the casing.
z
Connect system to mains power supply.
Fig. 51 Swivel UBA housing downwards
1
Fig. 52 Opening the UBA housing
Fig. 53 Carefully lift the UBA to remove
