Buderus Logamax plus GB142-24 Servicing Instructions page 81

Locking boiler fault code 9L
9 L 2 3 4
9 L 2 3 8
Press the
New fault message
Check the plug-and-socket connection of the
gas valve. See page 98, par. 8.1.18.
Is the plug-and-socket
connection okay?
Measure the wire between the gas valve
and the UBA 3.
See page 99, fig 8.1.20.
Is the wire okay?
Measure the resistance of the two gas valve
coils. See page 101, par. 8.1.22.
Is the resistance correct?
page 83
Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
The gas valve coil or the wiring to the gas
valve is defective.
The UBA 3 is defective.
button.
"Reset"
No
9 L
?
Yes
No
Yes
No
Yes
No
Yes
44
Locking boiler-fault code.
Locking boiler-fault code.
Restore the plug-and-socket connection.
See page 98, par. 8.1.18.
Replace the cable loom or the affected part
thereof.
Replace the gas valve.
See page 101.
Diagnosis
8
page 31
7
81