Troubleshooting
3
Subject to modifications resulting from technical improvements!
Buderus Ltd. • http://www.buderus-domestic.co.uk
Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006
51
3.1.9
Checking the fan
z
Set the mains switch to “
0
”.
z
Disconnect the fan's plug and socket connection.
z
Connect a multimeter (230 V AC).
z
Turn the mains 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 mains switch to “
0
”.
z
If the power supply is in order, plug the unit in once more.
z
Turn the mains 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 operation of
the boiler is not possible), troubleshooting should start at
the connection cable to the UBA or UBA.
3.1.10 Replacing the fan
z
Shut the gas cock.
z
Disconnect the system from the power supply.
z
Disconnect the fan, using the plug and socket from the
power supply (fig. 55, item 1), loosen the UBA control line
at the fan (fig. 55, item 2) and the gas burner fitting (fig. 55,
item 3).
z
Loosen the union nut (fig. 55, item 4) on the gas burner
fitting.
Fig. 54 Checking the fan
Fig. 55 Replacing the fan on the 600 Series:
Loosen plug and union nut
1
2
3
4
