Buderus 600 - 11R Installation And Servicing Instructions page 59

5.3.10 Checking the safety 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 power switch to "0".
Disconnect the system from the power supply.
Unplug cable connection from flow sensor (fig. 60,
item 1).
Disconnect 18-pin plug from UBA (fig. 60, item 2).
Use a continuity tester to check the cable between
the plug-in connection and the 18-pin plug in the
UBA. The test should be carried out on connections
06-18 and 08-18 (fig. 60).
If the cables are in order, plug them in.
Connect system to mains power supply.
Turn the power switch to "I".
5.3.11 Checking the flow sensor
Unplug cable connection from sensor.
Measure resistance of sensor (fig. 61, item 1).
Use a second-reading thermometer to measure the
temperature around the sensor.
Compare readings with values shown in table 6. If
there is any mismatch (i.e. > 5%), the sensor is
defective.
If the sensor is working correctly, plug it in once
more.
Subject to modifications resulting from technical improvements!
Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
1
Fig. 60 Buderus 600 - 11R / 19R / 24R:
checking the safety sensor connection lead
1
Fig. 61 Buderus 600 - 11R / 19R / 24R:
checking the flow sensor
Buderus • http://www.buderus-domestic.co.uk
Servicing 5
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