Buderus Logamax plus GB142-24 Servicing Instructions page 60

7 Diagnosis
Locking boiler-fault code 4C (flashing)Locking boiler-fault code 4E (flashing)
2 2 4
4 C
Check the contact between the UBA 3
and the UBA 3 mounting base.
See page 126, fig 110.
Is the contact okay?
Try to remedy the fault by replacing the entire
cable loom.
Has the malfunction been repaired?
44
page 83
2 7 8
4 E
Measure the voltage to check for a possible
short circuit in the supply or safety sensor
wiring. See page 126.
Is the wiring
okay?
44
page 83
Locking boiler-fault code 4E (flashing)
60 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
The UBA 3 does not register the short cut
bestween the unused contacts 22 and 24.
No
Yes
Yes
No
The sensor test has failed.
No
Yes
Locking boiler-fault code.
Restore the contact between the UBA 3 and
the UBA 3 mounting base.
See page 125, fig 109.
Locking boiler-fault code.
Replace the cable loom or the affected part
thereof.
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8
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