Cause Remedy
Pulsations at start
The ignition electrodes are wrongly adjusted Re-adjust.
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 Re-adjust
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.
Air pressure switch defective or incorrectly adjusted Contact the electricity authorities if necessary.
Spark-over in ignition electrodes Replace the electrodes
The ambient temperature of the gas relay is too high Heat insulate, max. 60° C.
The ignition spark is too weak Check the transformer
Bad combustion
Bad draught conditions Check the chimney
The flue gas temperature is too high The boiler is overloaded. Reduce the quantity of gas.
The CO
2
-content is too low Check the boiler with regard to leaks. Choke
the draught if it is too high.
The CO-content is too high
Excess air when using natural gas and Choke the air.
gasoil (propane, butane)
Air shortage Open the air supply. Check the flue gas damper.
The holes in the gas nozzle are clogged Clean.
The fresh air intake is too small Check and enlarge
The flame is not burning straight because Check the burner head and readjust.
the burner head is out of position
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