Servicing
5
48
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
Subject to modifications resulting from technical improvements!
Boulter Buderus Ltd. • http://www.boulter-boilers.com
5.3.3
Checking or replacing the fan
z
Disconnect the system from the mains power supply.
z
Remove casing and ventilation cover.
z
Set multimeter to VAC.
z
Remove the 230 VAC plug (see fig. 63) from the fan.
z
Connect the multimeter to the blue and brown connections.
z
Connect the system to the mains power supply.
z
Check if there is 230 VAC on the connections when the
operating code "
0C
" appears in the display.
z
If necessary remove the UBA (see fig. 62) and set the
multimeter to measuring resistance. The resistance of
each pole should be 0
Ω
.
z
Reconnect the cable.
z
If necessary measure the resistance over the tachoplug
(see fig. 64) in the same manner.
z
If the problem is still not solved then replace the fan.
z
Disconnect the plug from the gas valve (fig. 65, item 1).
z
Loosen the swivel nut (fig. 65, item 2)
z
Remove the suction tube (fig. 65, item 3).
fig. 63 Remove 230 VAC plug
fig. 64 Measure resistance of tachoplug
fig. 65 Remove suction tube
1
2
3
