Buderus Logamax plus GB162-80 kW Service Instructions Manual page 53

section 62
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Step 1  Replace the UBA 3 by a UBA 3 provided with the most recent software possible.
Step 2 Has the fault been remedied?
Step 3 Diagnosis: The KIM is too new for the UBA 3. Measure: Contact the manufacturer. See the back of this
document.
section 63
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Step 1  Check the plug-and-socket connection of the gas valve, see section 109.
Step 2 Is the plug-and-socket connection okay?
Step 3 Diagnosis: The plug-and-socket connection has come loose.
Action: Replace the plug-and-socket connection, see section 109.
Step 4  Check the electrical resistance of the power supply cord of the gas valve as indicated in section 111.
Step 5 Is the wire okay?
Step 6 Diagnosis: The wire harness is defective. Action: Replace the wire harness or the affected part.
Step 7  Check the electrical resistance of the gas valve coils as indicated in section 111.
Step 8 Is the resistance correct?
Step 9 Diagnosis: The gas valve is defective. Action: Replace the gas valve, see section 113.
section 64
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Step 1  Check that no hot-water tap is dripping and that there is no leakage in the hot-water pipe.
This can be checked by feeling whether the hot-water pipe is hot at half a metre below the boiler.
Step 2 Is a hot-water tap dripping or is there a leakage in the hot-water pipe?
Step 3 Diagnosis: The hot-water tap is dripping or the hot-water pipe is leaking.
Action: Fix the dripping hot-water tap or the leakage in the hot-water pipe.
Step 4  Check the electrical resistance of the DHW temperature sensor as indicated in section 93.
Step 5 Is the electrical resistance of the DHW temperature sensor okay?
Step 6 Diagnosis: The DHW temperature sensor is defective.
Action: Replace the DHW temperature sensor, see section 95.
Step 7  Check the movement of the servomotor of the three-way valve.
Step 8 Does the servomotor of the three-way valve move?
Step 9  Check that the three-way valve has been installed correctly.
Step 10 Has the three-way valve been installed correctly?
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
Locking fault code: The KIM is too new for the UBA 3 (section 1, [32]).
Locking fault code: The contacts of the gas valve (section 1, [21]) are open.
Blocking fault code: 4 hours of continuous DHW operation, while a heat demand also occurred
at the same time. The DHW operation has been switched off after this period of 4 hours, for as
long as the boiler is active for the heating operation.
Diagnosis 6
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Yes: Section 67
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No: Step 3
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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 7
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No: Step 6
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Section 67
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Yes: Section 66
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No: Step 9
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Section 67
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Yes: Step 3
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No: Step 4
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Section 67
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Yes: Step 7
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No: Step 6
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Yes: Step 9
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No: Step 12
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Yes: Step 18
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No: Step 11
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