Buderus Logamax plus GB142-24 Servicing Instructions page 82

7 Diagnosis
Locking boiler fault code H 7/P--
2 8 8
C 0
2 8 9
C 0
Check the plug-and socket connection of the
pressure sensor. See page 8, fig. 1, pos. 17.
Is the plug-and-socket
connection okay?
Check the wiring between the pressure
sensor and the UBA 3 mounting base by
measuring the resistance (fracture).
See page 126, fig 110.
Is the wiring okay?
Try to remedy the fault by integrating
another provisional pressure sensor.
See page 116.
Has the malfunction been repaired?
page 83
82 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
The UBA 3 has no connection to the pressure
sensor or there is a short circuit.
Short circuit in connection to pressure sensor.
No
Yes
No
Yes
Yes
No
44
Locking boiler-fault code.
Locking boiler-fault code.
Restore the plug-and-socket connection.
Replace the cable loom or the affected part
thereof.
8
page 31