58
Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
Buderus • http://www.buderus-domestic.co.uk
Subject to modifications resulting from technical improvements!
Servicing
5
5.3.7 Checking the miniature fuses
z
Disconnect the system from the power supply.
z
Loosen the two fixing screws and carefully turn the
UBA around.
z
Check miniature fuses (fig. 57) for correct func-
tioning, or carry out visual inspection. If defective, fit
new fuse (1.25 AT).
z
Turn the UBA around and place back onto the
bracket.
z
Tighten the two screws.
z
Connect system to mains power supply.
5.3.8 Checking the safety sensor
z
Unplug cable connection from sensor.
z
Measure resistance of sensor (fig. 58, item 1).
z
Use a second-reading thermometer to measure the
temperature around the sensor.
z
Compare readings with values shown in table 6 on
page 60. If there is any mismatch (i.e. > 5%), the
sensor is defective.
z
If the sensor is working correctly, plug it in once
more.
5.3.9 Replacing the safety sensor
z
Shut the servicing valve.
z
Drain the Buderus 600 - 11R / 19R / 24R as per the
"Installation and Servicing Instructions".
z
Loosen the plug-in connection (fig. 59, item 1).
z
Unscrew the sensor (fig. 59, item 2) and replace with
a new unit.
z
Plug in cable connection.
z
Open servicing valves.
Fig. 57 Checking the miniature fuse
1
2
3
Fuse
Function
1
Glow ingitor
2
UBA, sensors, thermostat valve
3
UBA
Fig. 58 Buderus 600 - 11R / 19R / 24R:
checking the safety sensor
Fig. 59 Buderus 600 - 11R / 19R / 24R:
replacing the safety sensor
NOTE
Fill the Buderus 600 - 11R / 19R / 24R and
purge the system of air.
