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Servicing
5.3.6
Checking the pump
Remove screw plug on the pump (fig. 72).
Turn the mains power switch to "I".
Wait about 4 minutes until "2L" appears in the display.
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.
If the pump is working correctly, screw the plug back in.
5.3.7
Replacing the pump
Disconnect the system from the power supply.
Shut the servicing valve.
Drain the system (see page 23).
Loosen both swivel nuts (see fig. 73, item 1)
Take out the pump.
Replace it with new pump and reassemble in reverse
order.
Purge the system and the pump of air.
Connect system to mains power supply.
Open servicing valves.
NOTE
Fill the 600 - 28C and purge the system of air.
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
fig. 72 Checking the pump
fig. 73 Replacing the pump
Boulter Buderus Ltd. • http://www.boulter-boilers.com
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