Buderus Logamax plus GB142-24 Servicing Instructions page 48

7 Diagnosis
de 2E
The UBA 3 does not register any connections
1 L 2 1 1
to the unused contacts 78 and 50.
Check the contact between the UBA 3
and the UBA 3 mounting base.
See page 125, fig 109.
Is the contact
okay?
Try to remedy the fault by replacing the entire
cable loom.
Has the malfunction been repaired?
44
page 83
The system pressure is too low.
2 E 2 0 7
Is the pressure
in the heating system at least
14.5 psi (1 bar)?
Replace the pressure sensor to test whether
the fault can be traced back to the sensor.
See page 116.
Is the
blocking boiler-fault code
cleared from the display?
44
page 83
Operating code 2F
48 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
No
Yes
Yes
No
No
Yes
Yes
No
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.
Fill and bleed the heating system.
8
page 31
8
page 31