Buderus Logamax plus GB162-80 kW - 6 Diagnosis

Diagnosis6
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
30
6 Diagnosis
section 30 Diagnosis
You can find a further explanation of the diagnosis in section 6, chapter 1 on page 6.
section 31
No indication on the display of the BC10 (section 1, [4]).
Step 1 Does the boiler work normally? Yes: → Step 2
No:
→ Step 11
Step 2.  Check that there is 7.8 to 15.2 VDC on both contacts 1 and 2 of the connector between the BC10 and the bottom
plate of the BC10, see section 124 and section 131.
Step 3 Is there a voltage? Yes:
→ Step 4
No: → Step 8
Step 4  Check the contact between the BC10 (section 1,[4]) and its slot by pushing on the BC10.
Step 5 Is there any indication on the BC10 display within a few minutes? Yes:
→ Step 6
No:
→ Step 7
Step 6 Diagnosis: There is insufficient contact between the BC10 (section 1, [4]) and its slot.
Action: replace BC10 and/or its slot.
→ Section 67
Step 7 Diagnosis: The control panel BC10 is out of order.
Action: Replace BC10. See the Installation and servicing instructions of the BC10.
→ Section 67
Step 8  Check the corresponding component of the wire harness, see section 131.
Step 9 Is the wire harness free of damage? Yes:
→ Section 66
No:
→ Step 10
Step 10 Diagnosis: The wire harness is defective. Action: Replace the wire harness or the affected part. → Section 67
Step 11  Check that the plug is in the grounded socket.
Step 12 Is the plug in the grounded socket? Yes:
→ Step 14
No: → Step 13
Step 13 Diagnosis: The plug is not in the grounded socket.
Action: Insert the plug into the grounded socket, see section 79.
→ Section 67
Step 14  Check that the main power switch is in position "1" as indicated in section 80.
Step 15 Is the main power switch in position “1” (On)? Yes:
→ Step 17
No:
→ Step 16
Step 16 Diagnosis: The main power switch is not in position“1” (On).
Action: Turn the main power switch in position "1" (ON), see section 80.
→ Section 67
Step 17  Is there 120 VAC on the grounded socket?
Step 18 Is there 120 VAC on the grounded socket? Yes:
→ Step 20
No:
→ Step 19
Step 19 Diagnosis: There is not 120 VAC on the grounded socket.
Action: Remedy the problem in the electrical system.
→ Section 67
Step 20  Measure the resistance of the 120 VAC power supply cable.
Step 21 Is the resistance of the 120 VAC power supply cable within the specified limits? Yes:
→ Step 23
No:
→ Step 22
Step 22 Diagnosis: The wire harness is defective. Action: Replace the wire harness or the affected part.
→ Section 67
Step 23  Test the fuse on the rear of the UBA 3 using a multimeter, see section 82.
Step 24 Is the fuse working correctly? Yes:
→ Section 66
No:
→ Step 25