Boulter Buderus Benchmark 600-28C Installation And Servicing Instruction page 43

Servicing
Code Meaning
6L Blinking fault code: Flame goes out during operation
Possible
cause
1 Gas/air ratio not in order
2 Wrong gas supply pressure
3 Earthing cable may be faulty
4
Ionisation electrode may be faulty
5 Recirculation of flue gas
6
Gas valve shuts down during operation
Code Meaning
6P
Blinking fault code: Glow ignitor has been on too long
Possible
cause
1
2
KIM may be defect
Code Meaning
7C Blinking fault code: Mains supply interrupted
Possible
cause
1 A problem with the mains supply
2 Reset button pressed too briefly
Code Meaning
7L Blinking fault code: Internal UBA error
Possible
cause
1 Bad UBA connection
UBA may be defective
KIM may be defective
Code Meaning
8Y Blinking fault code: External switch contact is open
Possible
cause
1 External switch contact (e.g. temperature-monitoring
device for underfloor heating has been tripped or gas
pressure too low
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
Action
Check and adjust the gas/air ratio (see subsection 2.1.8)
Check the gas-supply pressure (see subsection 2.1.7)
Check the earthing cable connections (yellow/green wire)
Check the cabling on the ionisation electrode, check the
ionisation electrode and replace when necessary
(see subsection 2.1.11 and subsection 5.3.13).
Check the flue gas system
Check connections and wiring of the gas valve and replace
when necessary
Action
Try to reset the boiler by pressing the reset button for
2 seconds
Check if UBA 3 is fitted tightly onto the boiler
(see subsection 5.3.2).
If this is the case then contact the Boulter Buderus service
department.
Action
Carry out a power test procedure for safe testing of the
mains electrical supply
Press the Reset button for two seconds
Action
Check UBA connector
Replace UBA (see subsection 5.3.2)
Call the service department of Boulter Buderus
Action
– Check wiring and connections of the external switch
contact
– Check the external switch contact
Boulter Buderus Ltd. • http://www.boulter-boilers.com
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