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6
Diagnosis
box 34
Replace the pump, see box 101.
step 15
box 35
[4p]
Check the flow NTC sensor and safety sensor, see box 104.
step 1
Are the flow NTC sensor and safety sensor functioning correctly?
step 2
Replace the flow NTC sensor and safety sensor, see box 116.
step 3
Check the cable of the flow NTC sensor and safety sensor, see box 112.
step 4
Are the cables in order?
step 5
Replace the cable loom (or the affected part thereof).
step 6
box 36
C [6a]
[6a]
Is the heating system propane gas-fired?
step 1
Ensure that no nitrogen remains in the gas tank or gas flow pipes.
step 2
You should also consult your gas utility company.
Check whether the gas tap is open, see box 59.
step 3
Is the gas tap open?
step 4
Open the gas tap, see box 59.
step 5
Check the static and working gas pressure, see box 230.
step 6
Are the static and working gas pressures correct?
step 7
Check to see if there is a restriction in the pipework between the gas tap and gas valve.
step 8
Is there a restriction?
step 9
Deal with restriction.
step 10
Check for restrictions in the remaining section of the gas flow pipe.
step 11
Is there a restriction?
step 12
Deal with restriction.
step 13
Has the gas flow pipe been bled of air?
step 14
Vent the gas flow pipe of air, see box 239.
step 15
Check to see if the glow ignitor activates with the operating code
step 16
Does the glow ignitor activate with the operating code
step 17
We reserve the right to make technical modifications
32
The contacts of the flow NTC sensor or safety sensor are broken.
Locking boiler-fault code
The system has detected an insufficient ionisation current during the ignition phase.
Blocking boiler-fault code
The system has detected an insufficient ionisation current after four startup
attempts.
Locking boiler-fault code
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
C [0c]
, see box 130.
C [0c]
?
Buderus Ltd. • http://www.buderus-domestic.co.uk
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box 42
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Yes:
step 4
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No:
step 3
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Yes:
box 41
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No:
step 6
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box 42
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Yes:
step 2
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No:
step 3
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step 63
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Yes:
step 6
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No:
step 5
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step 63
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Yes:
step 14
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No:
step 8
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Yes:
step 10
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No:
step 11
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step 63
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Yes:
step 13
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No:
step 38
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step 63
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Yes:
step 16
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No:
step 15
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step 62
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Yes:
step 21
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No:
step 18
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