Buderus Logano GE434 Maintenance Instructions Manual page 56

11 Troubleshooting
Fault
Main flame does not
burn.
Pilot flame burns
constantly, but no fault.
Main flame burns very
shallow.
Unpleasant burner
whistle.
Burner sooty.
Main flame burns very
shallow.
Unpleasant burner
whistle.
Burner sooty.
Burner ignition very
noisy and extreme
combustion noises.
Flame may be visible at
the main gas nozzles.
Flue gas odour inside
the boiler room.
We reserve the right to make any changes due to technical modifications.
Commissioning and maintenance instructions Logano GE434 Gas-fired special boiler • Issue 02/2003
56
Possible causes for faults
Wiring not in accordance with wiring diagram?
Gas solenoid valve or burner control unit
faulty?
Contact not OK (loose contact)?
Are main gas nozzle and supply gas compatible? If not: Install the correct main gas nozzle.
Is the nozzle pressure adjusted correctly?
Is the start-up load setting correct?
Is contamination of slots or below the burner rod
slots obvious e.g. fluff, fibre, airborne seeds,
building dust?
Do ventilation and extract apertures comply with
local regulations or those stipulated by your local
gas supply company?
Do apertures function permanently?
Are deposits or fibre contamination visible on the
heat exchanger surface?
Visual check through the clean-out cover and
combustion chamber.
Are burner rods damaged, deformed or individual
slots deformed?
Are the correct nozzles installed?
Is the nozzle pressure adjusted correctly?
Is the start-up load setting correct?
Does flue gas escape around the draught hood? Determine and remedy the cause for insufficient flue
Negative pressure in the flue pipe > 3 Pa?
Is the flue pipe blocked?
Is the size of the chimney OK?
Are fans used in the boiler room, which extract air
from the room (extractor hoods, dryers...)?
Are deposits or fibre contamination visible on the
heat exchanger surface?
Visual check through the clean-out cover and
combustion chamber.
Remedy
Correct wiring in accordance with the wiring diagram.
Check the gas solenoid valve or burner control unit,
and replace faulty parts, if required.
Check and replace contacts, if required.
Check the setting details and correct, if required.
Carry out the burner wet cleaning process described
in this manual.
Determine the source of contamination and prevent
further contamination.
In case of airborne seed, install an air filter in the inlet
air supply acc. to requirements.
In case of insufficient ventilation air, immediately and
permanently remedy that shortcoming.
Carry out the dry and possibly wet cleaning process
for the boiler described in this manual.
Replace burner rods, and determine/remedy the
cause.
Info: Damage and deformation only arise, if one of
the faults listed above has occurred.
Shut the burner down, install new burner rod and
remedy faulty gas conversion.
draught. Shut the burner down, if the fault cannot be
remedied immediately.
Clean the boiler dry or, if required, wet.
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