Buderus 600 - 11R Installation And Servicing Instructions page 56

5 Servicing
5.3.4 Checking the fan
Set the power switch to "0".
Disconnect the fan's plug and socket connection.
Connect a multimeter (230 V AC).
Turn the power switch to "I".
Take voltage reading at measuring device.
If the voltage reading is 230 V, the power supply is in
order.
Set the power switch to "0".
If the power supply is in order, plug the unit in once
more.
Turn the power switch to "I".
If the fan now fails to run, it must be replaced.
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
Shut the gas valve.
Disconnect the system from the power supply.
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).
Loosen the union nut (fig. 52, item 4) on the gas
burner fitting.
Push the safety plate out of the way (fig. 53, item 1).
Turn air silencer tube and pull off from below.
Buderus • http://www.buderus-domestic.co.uk
56 Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
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
Subject to modifications resulting from technical improvements!
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