Buderus 500 - 28/C Servicing Manual page 29

box 27
Replace the by-pass valve.
step 16
box 28
[1c]
Check to ensure that the restrictor baffle has been installed as per box 261, item 1.
step 1
Has the restrictor baffle been fitted?
step 2
Fit the restrictor baffle, see box 261, item 1.
step 3
Check the entire system of flue gas pipe for restrictions.
step 4
Is the entire system of flue gas pipe in full working order?
step 5
Deal with restriction.
step 6
Check the flue-gas STL, see box 120.
step 7
Is the flue-gas STL working correctly?
step 8
Replace the flue-gas STL, see box 129.
step 9
Check the wiring of the flue-gas STL, see box 126.
step 10
Is the wiring of the flue-gas STL in full working order?
step 11
Replace the cable loom (or the affected part thereof).
step 12
box 29
C [3a]
[3l]
Check to ensure that both plug-and-socket connections of the fan are correctly fitted, see box 246, item 1.
step 1
Are the plug-and-socket connections fitted correctly?
step 2
Reconnect the plug-and-socket connection of the fan.
step 3
Check fan, 230V AC supply, see box 66 or box 287.
step 4
Does activation take place correctly?
step 5
Check the power supply cable of the fan (230V AC), see box 69.
step 6
Is the power supply cable of the fan in full working order?
step 7
Replace the cable loom (or the affected part thereof).
step 8
Check tacho cable of fan, see box 73.
step 9
Is the tacho cable in full working order?
step 10
Replace the cable loom (or the affected part thereof).
step 11
Check to ensure that the mains voltage at the earthed (grounded) plug is between 195V and 253V AC.
step 12
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
The flue-gas STL (fume-monitoring device) has detected a temperature higher than
105°C. The flue-gas STL is open.
Locking boiler-fault code
The tacho signal from the fan has failed during the operating phase.
Blocking boiler-fault code
The tacho signal from the fan is not present during the pre-operative or operating
phase.
Locking boiler-fault code
Diagnosis
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Yes:
No:
Buderus Ltd. • http://www.buderus-domestic.co.uk
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