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