Buderus Logamax plus GB162-80 kW Service Instructions Manual page 52

6 Diagnosis
section 59
[7/c/\| e [2/3/1|
Step 1  Press and hold the "
Step 2 Is an error code displayed again?
Step 3  Check the meaning of the new fault, see section 29, and resolve the fault.
section 60
e
[7/h/\| [3/2/8|
Step 1  Check whether windmills, generators or other equipment are present which may have caused the main voltage
to be interrupted.
Step 2 Is this the case?
Step 3 Diagnosis: The fault is caused by the presence of windmills, generators or other equipment which may
cause the main voltage to be interrupted. Action: Place the affected equipment out of service.
Step 4  Use a main voltage monitoring device to check, over a long period of time, whether the main voltage is actually
interrupted briefly.
Step 5 Has the main voltage actually been briefly interrupted?
Step 6 Diagnosis: The cause of the fault lies in the electrical system.
Action: Solve the problem in the electrical system.
section 61
e
[8/y/\| [2/3/2|
Step 1  Check that an external switch contact has been connected to the device, see section 116.
Step 2 Is an external switch contact connected?
Step 3  Check that a connection is present, see section 116.
Step 4 Is there a connection?
Step 5 Diagnosis: There is no connection. Action: Restore the connection to the connection box, see section 116, [1].
Step 6  Check the wire harness between the connection tray and the UBA 3 mounting base according to section 131.
Step 7 Is the wire harness okay?
Step 8 Diagnosis: The wire harness is defective. Action: Replace the wire harness or the affected part.
Step 9  Check that the fault can be remedied by making a connection, see section 116.
Step 10 Has the fault been remedied?
Step 11 Diagnosis: The external switch contact has opened or a wire has broken in the external switch contact
wiring outside the boiler. Action: Remedy the cause of the external switch contact opening or replace the wiring.
52
Locking fault code: The power supply was interrupted during a locking fault
[4/a/\| [2/1/8| [4/c/\| [2/2/4|
,
[4/u/\| [2/2/2| or [4/y/\| [2/2/3|.
c
" button for at least 2 seconds.
Blocking fault code: The main voltage has been briefly interrupted.
Operating code: The external switch contact has opened.
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
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, ,
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, ,
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Yes: Step 3
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No: Section 67
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Section 67
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Yes: Step 6
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No: Section 66
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Section 67
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Yes: Step 9
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No: Step 3
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Yes: Step 6
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No: Step 5
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Section 67
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Yes: Section 66
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No: Step 8
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Section 67
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Yes: Step 11
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No: Step 6
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Section 67