Buderus Logamax plus GB142-24 Servicing Instructions page 50

7 Diagnosis
Locking boiler fault code 2L
The primary circulation pump does not
2 L 2 66
generate a pressure difference.
Check the primary circulation pump for
mechanical jamming.
Is the primary circulation pump
jammed?
Does the primary circulation
pump run during
Check the primary circulation pump
activation.
Is the activation okay?
Check the primary circulation pump; check
that the supply cord is not broken.
Is the supply cord okay?
44
page 83
50 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
Yes
No
Yes
2 L
?
No
Yes
No
No
Yes
Locking boiler-fault code.
Try to undo the jam or replace the primary
circulation pump.
22
page 51
Replace the primary circulation pump.
Replace the supply cord.
8
page 31