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Servicing
Reconnect all cables and connections.
5.3.9
Replacing the bi-sensor
Disconnect the boiler form the mains power supply.
Close gas valve.
Drain the system (see page 23).
Disconnect the plug of the bi-sensor (see fig. 84, item 1).
Remove spring clip (see fig. 84, item 2)
Remove the bi-sensor (see fig. 84, item 3).
Some remaining water may leak out.
Replace with new sensor and reassemble in reverse order.
Fill the system and purge the system of air
(see subsection 2.1.1).
Disconnect the boiler form the mains power supply.
Close gas valve.
Drain the system (see page 23).
Disconnect the plug of the return sensor (see fig. 85).
Remove the return sensor.
Some remaining water may leak out.
Replace with new sensor and reassemble in reverse order.
Fill the system and purge the system of air
(see subsection 2.1.1).
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
fig. 83 Measure resistance of hot water heat retaining sensor
2
3
1
fig. 84 Replace bi-sensor
fig. 85 Disconnect plug return sensor
Boulter Buderus Ltd. • http://www.boulter-boilers.com
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