Buderus 500 - 24/C, Servicing Manual

Page: 34 / 80

Diagnosis 6
We reserve the right to make technical modifications Buderus Ltd. • http://www.buderus-domestic.co.uk
34 Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
step 47
The following components must be checked for soiling, damage and/or correct installation:
– condensate trap and syphon, see box 256
– combustion-air inlet pipework
– air silencer pipework
– seal between the Venturi and fan
– Venturi, see box 86
– gas injector, see box 83, item 1
– fan
– connection between the fan and burner
– burner
– heat exchanger
– system of flue-gas pipe and air inlet pipeworks
– pressure control valve, see box 85
– earth (ground) lead of ionisation circuit, see box 160.
step 48
Are the above-mentioned components clean, free of damage and/or correctly intalled? Yes:
→
step
50
No:
→
step
49
step 49
Clean, replace and/or correctly install the components concerned.
→
step
62
step 50
Measure the ionisation current, see box 143.
step 51
Is the ionisation current in order? Yes:
→
step
62
No:
→
step
52
step 52
Check the plug-and-socket connection between the ionisation electrode and cable loom, see box 144.
step 53
Is the plug-and-socket connection in full working order? Yes:
→
step
55
No:
→
step
54
step 54
Correctly insert the plug into its socket
→
step
62
step 55
Check the cable of the ionisation electrode, see box 151.
step 56
Is the wiring in order? Yes:
→
step
58
No:
→
step
57
step 57
Replace the cable loom (or the affected part thereof).
→
step
62
step 58
Check the ionisation electrode and replace as required, see box 155.
→
step
62
step 59
Temporarily disconnect the flue-gas pipework from the top of the boiler.
Run the boiler at low mode, see box 13. Check to see if the fault has been rectified.
step 60
Has the malfunction been repaired? Yes:
→
step
61
No:
→
step
62
step 61
The cause of the fault lies in the flue-gas system. Take the boiler out of operation.
→
box
42
step 62
Switch the boiler off and then on again at the operating switch.
step 63
Is the error code still displayed? Yes:
→
step
64
No:
→
box
42
step 64
Has an error
C [6a]
reoccurred? Yes:
→
step
66
No:
→
step
65
step 65
Interpret the display code with box 20 and deal with the fault.
step 66
Has the entire table box 36 been covered? Yes:
→
box
41
No:
→
step
1
box 36