Boulter Buderus Benchmark 600 Series, Installation And Servicing Instruction

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Servicing 5
42 Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
Subject to modifications resulting from technical improvements! Boulter Buderus Ltd. • http://www.boulter-boilers.com
Code Meaning
6A
Blinking fault code : No ionisation message after ignition
Possible
cause Action
1 There is no flame, hot surface ignitor doesn’t
glow, fan is turning – Check wiring of the hot surface ignitor, measure the resistance
of the hot surface ignitor (should be between 50 and 300
Ω
).
Replace hot surface ignitor when necessary (see subsection
5.3.11 and subsection 5.3.12)
– Check the UBA’s F1 fuse, replace when necessary
2 There is no flame, hot surface ignitor does glow,
fan isn’t turning – Check the fan and KIM connectors and the UBA fuses
3 There is no flame, hot surface ignitor and fan
are working – Check and adjust the gas/air ratio (see subsection 2.1.8)
– Check for 24 V~ on the gas valve during start up
– Check the gas-supply pressure (see subsection 2.1.7), this
should be higher than 20 mbar for natural gas.
– Check the earthing cable connections (yellow/green wire).
– Check the cabling on the ionisation electrode
4 There is a flame, but the flame disappears
when the fan starts up – Check the gas-supply pressure (see subsection 2.1.7), this
should be higher than 20 mbar for natural gas.
– Check and adjust the gas/air ratio (see subsection 2.1.8)
– Check the earthing cable connections (yellow/green wire)
– Check the cabling on the hot surface ignitor
– Press reset. If fault code remains then try to temporarily connect
a different UBA (see subsection 5.3.2)
Code Meaning
6C Blinking fault code : Ionisation message, but no flame
Possible
cause Action
1 There is no flame, hot surface ignitor doesn’t
glow, fan is turning – Check wiring of the hot surface ignitor, measure the resistance
of the hot surface ignitor (should be between 50 and 300
Ω
).
Replace hot surface ignitor when necessary (see subsection
5.3.11 and subsection 5.3.12)
– Check the UBA’s F1 fuse, replace when necessary
2 There is no flame, hot surface ignitor does glow,
fan isn’t turning – Check the fan and KIM connectors and the UBA fuses
3 There is no flame, hot surface ignitor and fan
are working – Check and adjust the gas/air ratio (see subsection 2.1.8)
– Check for 24V – on the gas valve during start up
– Check the gas-supply pressure (see subsection 2.1.7), this
should be higher than 20 mbar for natural gas.
– Check the earthing cable connections (yellow/green wire).
– Check the cabling on the hot surface ignitor
4 There is a flame, but the flame disappears
when the fan starts up – The gas valve doesn’t close properly. If there is still more than
20 V~ on the gas valve when there is no heat demand then
check the UBA by temporarily connecting a different UBA.
– Check ionisation electrode/circuit (see subsection 2.1.11 and
subsection 5.3.13)
– When both the UBA and the ionisation electrode/circuit are OK,
then replace the gas valve
– Press reset. If fault code remains than try to temporarily connect
a different UBA (see subsection 5.3.2)