58
170 091 16 03-01
2(3)
Cause Remedy
No flame establishment despite a trouble free start
The gas solenoid valve defective Replace
The gas solenoid valve does not open despite Replace coil or the whole valve if necessary.
its obtaining voltage
No voltage to the solenoid valve Check the contact
No electrical connection through Test the adjustment and the function of the air pres-
the air pressure switch sure switch.
The starting load is not correctly adjusted Reduce or increase the gas supply, reduce the quanti
ty of air.
Gas relay defective Replace
Air pressure switch incorrectly adjusted or defective Check the adjustment and readjust.
No reponse as the cams of the servomotor
are not correctly adjusted or out of position.
The burner locks out after the safety time has el-
apsed in spite of flame establishment
No ionisation current or the UV-cell in wrong Adjust the ionisation electrode and the UV-cell,
position examine cables and connections.
The supervision part of the gas relay is defective Replace the relay
Voltage lower than 185 V Contact the electricity authorities.
The ignition electrodes are disturbing the ionisation Adjust the ignition electrodes, repole the ignition
current 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.
Condensation in boiler and chimney
The flow gas temperature is too low or the Increase the flue gas temperature by increasing
quantity of gas is not sufficient the gas supply. Insulate the chimney.
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