Technical data

56 Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006

Buderus • http://www.buderus-domestic.co.uk Subject to modifications resulting from technical improvements!

Servicing5

5.3.4 Checking the fan

z Set the power switch to “0”.

z Disconnect the fan's plug and socket connection.

z Connect a multimeter (230 V AC).

z Turn the power switch to “I”.

z Take voltage reading at measuring device.

If the voltage reading is 230 V, the power supply is in

order.

z Set the power switch to “0”.

z If the power supply is in order, plug the unit in once

more.

z Turn the power switch to “I”.

z If the fan now fails to run, it must be replaced.

z If the fan runs at only partial load (i.e. effective oper-

ation of the boiler is not possible), troubleshooting

should start at the connection cable to the UBA or

UBA.

5.3.5 Replacing the fan

z Shut the gas valve.

z Disconnect the system from the power supply.

z Disconnect the fan, using the plug and socket from

the power supply (fig. 52, item 1), loosen the UBA

control cable at the fan (fig. 52, item 2) and the gas

burner connection fitting (fig. 52, item 3).

z Loosen the union nut (fig. 52, item 4) on the gas

burner fitting.

z Push the safety plate out of the way (fig. 53, item 1).

z Turn air silencer tube and pull off from below.

Fig. 51 Checking the fan

Fig. 52 Replacing the fan on the 600 Series:

loosen plug and union nut

Fig. 53 Replacing the fan on the 600 Series:

remove the air silencer tube