Buderus 500 - 24/C, Servicing Manual

Page: 33 / 80

Diagnosis 6
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Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006 33
step 18
Check the power supply cable of the glow ignitor, see box 137.
step 19
Is the power supply cable in full working order? Yes:
→
box
41
No:
→
step
20
step 20
Replace the cable loom (or the affected part thereof).
→
step
62
step 21
Check the electrical resistance of the glow ignitor, see box 134.
step 22
Is the electrical resistance of the glow ignitor in order? Yes:
→
step
24
No:
→
step
23
step 23
Replace the glow ignitor, see box 140.
→
step
62
step 24
Place the boiler in full-load operation, see box 13, and check whether the glow ignitor activates with the
operating code
C [0c]
.
step 25
Does the glow ignitor activate with the operating code
C [0c]
? Yes:
→
step
26
No:
→
step
23
step 26
Connect a digital pressure gauge, see box 233 and 234. Open the gas cock and place the boiler into
operation, see box 59 or box 13. Check whether the gas valve opens with the operating code
C [0l]
.
step 27
Does the gas valve open with the operating code
C [0l]
? Yes:
→
step
41
No:
→
step
28
step 28
Check the plug-and-socket connection on the gas valve, see box 161.
step 29
Is the plug-and-socket connection in full working order? Yes:
→
step
31
No:
→
step
30
step 30
Reconnect the plug-and-socket connection at the gas valve.
→
step
62
step 31
Check whether the gas valve receives power with the operating code
C [0l]
, see box 164.
step 32
Does the gas valve receive power? Yes:
→
step
33
No:
→
step
34
step 33
Replace the gas valve, see box 174.
→
step
62
step 34
Check the power supply cable of the gas valve, see box 167.
step 35
Is the wiring in order? Yes:
→
box
41
No:
→
step
36
step 36
Replace the cable loom (or the affected part thereof).
→
step
62
step 37
Check whether the incoming gas supply is of sufficient capacity.
step 38
Is the incoming gas supply of sufficient capacity? Yes:
→
step
40
No:
→
step
39
step 39
Upgrade internal pipe work.
→
step
62
step 40
Consult your gas utility company accordingly.
→
step
62
step 41
Measure the gas/air ratio during the startup phase, see box 233.
step 42
Is the gas/air ratio correctly adjusted? Yes:
→
step
44
No:
→
step
43
step 43
Adjust the gas/air ratio, see box 233.
→
step
62
step 44
Check to ensure that the correct gas injector, see box 83, item 1, and the correct Venturi,
see box 87, item 1, are fitted as specified. See also box 5.
step 45
Is the correct gas injector and Venturi fitted? Yes:
→
step
47
No:
→
step
46
step 46
Fit the correct gas injector and/or Venturi, see box 5.
→
step
62
box 36