Buderus Logamax plus GB162-80 kW Service Instructions Manual page 41

section 42 (continued)
Step 13 Diagnosis: The pressure sensor is defective. Action: Replace the pressure sensor, see section 128.
Step 14 Has the fault been remedied?
Step 15  Check the pump activation as instructed in section 88.
Step 16 Is the activation okay?
Step 17 Diagnosis: The pump is defective. Action: Replace the pump, see section 92.
Step 18  Check the pump power supply cord as instructed in section 89.
Step 19 Is the pump power supply cord okay?
Step 20 Diagnosis: The power supply cord is defective. Action: Replace the power supply cord of the pump.
section 43
e
[2/y/\| [2/8/1|
Step 1  Check that the pump has been purged correctly, see section 78.
Step 2 Has the pump been purged correctly?
Step 3 Diagnosis: There is air trapped in the pump. Action: Purge the pump, see section 78.
Step 4  Check the pump for mechanical obstructions as instructed in section 87.
Step 5 Is the pump blocked?
Step 6 Diagnosis: The pump is blocked. Action: Attempt to start up the pump again as indicated in section 87 or replace
the pump as indicated in section 92.
Step 7  Check that the tacho plug of the pump valve has been installed correctly, see section 90.
Step 8 Has the tacho plug of the pump been installed correctly?
Step 9 Diagnosis: The tacho plug of the pump has not been installed correctly.
Action: Install the tacho plug of the pump correctly, see section 90.
Step 10  Check the electrical resistance of the tacho cable of the pump as indicated in section 89.
Step 11 Is the pump tacho cable okay?
Step 12 Diagnosis: The wire harness is defective. Action: Replace the wire harness or the affected part.
Step 13  Check the pump power supply cord as instructed in section 89.
Step 14 Is the pump power supply cord okay?
Step 15  Check the pump for contamination as instructed in section 87.
Step 16 Is the pump dirty?
Step 17 Diagnosis: The pump is dirty. Action: Clean the pump, see section 87.
Step 18  Attempt to rectify the fault by temporarily replacing the pump, see section 92.
Step 19 Has the fault been remedied?
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
Operating code: The pump speed was found to be too high or too low while starting up
[0/u/\|. The modulating function of the pump is switched off. The pump continues to run, but
the pump speed is fixed.
Diagnosis 6
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Yes: Section 67
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No: Section 66
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Yes: Step 17
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No: Step 18
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Section 67
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Yes: Section 66
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No: Step 20
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Section 67
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Yes: Step 4
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No: Step 3
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Section 67
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Yes: Step 6
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No: Step 7
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Section 67
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Yes: Step 10
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No: Step 9
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Section 67
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Yes: Step 13
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No: Step 12
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Section 67
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Yes: Step 15
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No: Step 12
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Yes: Step 17
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No: Step 18
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Section 67
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Yes: Section 67
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No: Section 66
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