170 091 16 08-01
Voltage lower than 185 V
Contact the electricity authorities.
The ignition electrodes are disturbing the
ionisation current
Adjust the ignition electrodes, repole the ignition
transformer if necessary.
Bad earthing
Arrange for proper earthing.
Phase and neutral transposed
See wiring diagram and change.
The burner locks out during pre-purge
Air pressure switch defective or incorrectly adjusted
The starting load is not correctly adjusted
Reduce or increase the gas supply. Reduce the quantity
of air.
The gas pressure is too low
Increase the pressure. Contact the gas supply company
if necessary.
Pulsations at start
The ignition electrodes are wrongly adjusted
Readjust.
The gas pressure is too high
Check and adjust by means of a pressure gauge and a
pressure adjustment valve.
The flue gas side is blocked
Check the chimney flue.
Pulsations during operation
The burner is not correctly adjusted
Readjust
The burner is dirty
Clean the burner.
Defective chimney
Check and change the dimensions if necessary.
The burner is operating correctly but locking out now
and then
The ionisation current is too low
Check. Must be at least 4 µ A according to the relay
manufacturer but should be 8-20 µ A.
The UV-cell is in a wrong position
Adjust.
Voltage drop at certain times
Must not drop more than 15% of the rated current. Con
-
tact the electricity authorities if necessary.
Air pressure switch defective or incorrectly adjusted
Spark-over in ignition electrodes
Replace the electrodes
REMEDY
CAUSE
3(4)
