Buderus 800-24 Installation And Servicing Instructions page 44

5 Servicing
Code Meaning
8Y
Gas fault
Possible
cause
1 External switching contact (e.g. temperature-
monitoring device for underfloor heating has been
tripped or gas pressure too low
Code Meaning
9A
System error
Possible
cause
1 Regulating device may have to cope with interference
2 UBA may be defective
Code Meaning
9C
KIM error
Possible
cause
1 Kim connected incorrectly or KIM defective
Code Meaning
9L
Gas valve assembly error
Possible
cause
1 Wiring to the gas valve incorrect, or loose wiring
connections in UBA
2 UBA may be defective
3 Peaks in the electrical network
Code Meaning
9U
KIM defective
Possible
cause
1 Kim connected incorrectly or KIM defective
Subject to modifications resulting from technical improvements !
44 Installation and servicing instructions condensing gas boiler 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • edition 02/2006
Action
Check gas pressure detector is defective or the wires have
not been properly connected to the back of the UBA
(see subsection 5.3.18)
Action
– Check if for example induction fields interfere with the
regulating device
– Check if the are any peaks in the electrical network
caused by maybe windmills or a power generator
– Press reset. If fault code remains then try to temporarily
connect a different UBA (see subsection 5.3.5)
Action
Check the KIM connector and fan connector (see
subsection 5.3.21).
If the connectors are fine then contact Buderus
Action
– Check the electrical connections of the gas valve
– Measure the resistance of the gas valve (18-55 Ohm)
– Check if for example induction fields interfere with the
regulating device
– Press reset. If fault code remains then try to temporarily
connect a different UBA (see subsection 5.3.5)
– Check if the are any peaks in the electrical network
caused by maybe windmills or a power generator
Action
Check the KIM connector and fan connector (see
subsection 5.3.21).
If the connectors are fine then contact Buderus
Buderus • http://buderus-domestic.co.uk