Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
59
Subject to modifications resulting from technical improvements!
Buderus • http://www.buderus-domestic.co.uk
Servicing
5
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.
z
Set the power switch to “
0
”.
z
Disconnect the system from the power supply.
z
Unplug cable connection from flow sensor (fig. 60,
item 1).
z
Disconnect 18-pin plug from UBA (fig. 60, item 2).
z
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).
z
If the cables are in order, plug them in.
z
Connect system to mains power supply.
z
Turn the power switch to “
I
”.
5.3.11 Checking the flow sensor
z
Unplug cable connection from sensor.
z
Measure resistance of sensor (fig. 61, item 1).
z
Use a second-reading thermometer to measure the
temperature around the sensor.
z
Compare readings with values shown in table 6. If
there is any mismatch (i.e. > 5%), the sensor is
defective.
z
If the sensor is working correctly, plug it in once
more.
Fig. 60 Buderus 600 - 11R / 19R / 24R:
checking the safety sensor connection lead
1
2
Fig. 61 Buderus 600 - 11R / 19R / 24R:
checking the flow sensor
1
