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5
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. 62, item 1).
Unscrew the sensor (fig. 62, 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 power 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. 63).
If the cables are in order, plug them in.
Connect system to mains power supply.
Turn the power switch to "I".
Buderus • http://www.buderus-domestic.co.uk
60
Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
Temp.
Resistance
[°C]
[Ω]
0
29,490
5
23,462
10
18,787
15
15,136
20
12,268
25
10,000
30
8,197
35
6,754
40
5,594
45
4,656
50
3,893
table 6
Resistance values for hot water / boiler sensor
(approximate values)
1
1
2
Fig. 62 Buderus 600 - 11R / 19R / 24R:
replacing the flow sensor
UBA
1
11
Fig. 63 Buderus 600 - 11R / 19R / 24R:
checking the flow sensor connection lead
Subject to modifications resulting from technical improvements!
Temp.
Resistance
[°C]
[Ω]
55
3,271.0
60
2,760.0
65
2,339.0
70
1,990.0
75
1,700.0
80
1,458.0
85
1,255.0
90
1,084.0
95
1,939.6
100
1,817.2
10
20
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