Servicing
5
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
51
Subject to modifications resulting from technical improvements!
Boulter Buderus Ltd. • http://www.boulter-boilers.com
5.3.6
Checking the pump
z
Remove screw plug on the pump (fig. 72).
z
Turn the mains power switch to “
I
”.
z
Wait about 4 minutes until "
2L
" appears in the display.
z
Check to ensure that the pump is running. The pump’s
running mechanism may become blocked if the heating
system has been out of use for an extended period.
Use a screwdriver to rotate the pump in its normal running
direction and release the blockage in question. If this
procedure does not work, replace the pump.
z
If the pump is working correctly, screw the plug back in.
5.3.7
Replacing the pump
z
Disconnect the system from the power supply.
z
Shut the servicing valve.
z
Drain the system (see page 23).
z
Loosen both swivel nuts (see fig. 73, item 1)
z
Take out the pump.
z
Replace it with new pump and reassemble in reverse
order.
z
Purge the system and the pump of air.
z
Connect system to mains power supply.
z
Open servicing valves.
fig. 72 Checking the pump
fig. 73 Replacing the pump
1
NOTE
Fill the 600 - 28C and purge the system of air.
