Buderus 600 - 11S Installation And Servicing Instructions page 52

5 Servicing
5.3.15 Replacing the flow sensor
Shut the servicing valve.
Drain the 600 - 11S / 19S / 24S / 24C as per the
"Installation and Servicing Instructions".
Loosen the plug-in connection (fig. 71, item 1).
Unscrew the sensor (fig. 71, item 2) and replace with a new
unit.
Plug in cable connection.
Open servicing valves.
NOTE
Fill the 600 - 11S / 19S / 24S / 24C and purge
the system of air.
5.3.16 Checking the flow sensor connection lead
Check to ensure that all plug-in connections on the sensor and
UBA are in order. Note that an incorrectly-inserted plug can
lead to the generation of error messages. Start up the boiler by
pressing the "reset" button.
Set the mains switch to "0".
Disconnect the system from the power supply.
Unplug cable connection from flow sensor.
Disconnect 20-pin plug from UBA.
Use a continuity tester to check the cable between the
plug-in connection and the 20-pin plug in the UBA.
The test should be carried out on connections 05-20 and
18-20 (fig. 72).
If the cables are in order, plug them in.
Connect system to mains power supply.
Turn the mains power switch to "I".
Subject to modifications resulting from technical improvements!
52 Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 05/2004
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1
2
Fig. 71 600 - 11S / 19S / 24S / 24C:
replacing the flow sensor
UBA
1
11
Fig. 72 600 - 11S / 19S / 24S / 24C:
checking the flow sensor connection lead
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
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20