Buderus Logamax plus GB142-24 Servicing Instructions page 79

Operating code 8Y
7 L
2 6 1
7 L
2 8 0
page 83
The external switch contact is activated.
8 Y 2 3 2
Check that the switch contact is
connected to the boiler.
See page 106, fig. 54, pos. 5 "EV".
Is an external switch
contact connected?
Check to see if an external switch contact
is open, by measuring its resistance using a
volt-ohm-multimeter
Is the external switch
contact open?
Measure the cable loom between the UBA 3
and the terminal strip.
See page 126, fig 110.
Is the cable loom okay?
Check the contact between the UBA 3
and the UBA 3 mounting base.
Is the contact okay?
44
page 83
Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
The UBA 3 is defective.
The UBA 3 is defective.
44
No
Yes
Yes
No
No
Yes
No
Yes
Locking boiler-fault code.
Locking boiler-fault code.
Locking boiler-fault code.
43
page 80
External switch contact has energized.
Replace the cable loom or the affected part
thereof.
Restore the contact.
Diagnosis
8
page 31
7
79