Buderus 600-19R Installation And Servicing Instructions page 45

Servicing
5.3.12 Replacing the flow sensor
Shut the servicing valve.
Drain the Buderus 600 - 11R / 19R / 24R as per the
"Installation and Servicing Instructions".
Loosen the plug-in connection (fig. 52, item 1).
Unscrew the sensor (fig. 52, item 2) and replace with a new
unit.
Plug in cable connection.
Open servicing valves.
NOTE
Fill the Buderus 600 - 11R / 19R / 24R and
purge the system of air.
5.3.13 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. 53).
If the cables are in order, plug them in.
Connect system to mains power supply.
Turn the mains power switch to "I".
5.3.14 Checking the hot surface ingitor
Disconnect the system from the power supply.
Loosen the two fixing screws and carefully turn the UBA
around.
Unplug and remove hot surface ingitor from UBA housing
(fig. 54).
Check hot surface ingitor for free throughput.
If throughput is free, the hot surface ingitor is in order.
If the hot surface ingitor is in order, plug the cable into the
UBA housing.
Turn the UBA around and place back onto the bracket.
Tighten the two screws.
Connect system to mains power supply.
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 05/2004
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Fig. 52 Buderus 600 - 11R / 19R / 24R:
replacing the flow sensor
UBA
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Fig. 53 Buderus 600 - 11R / 19R / 24R:
checking the flow sensor connection lead
Fig. 54 Checking the hot surface ingitor
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
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