23
FAULT
PROBABLE CAUSE
No pre-heating of fuel
¥ No power
¥ Burner/Bag disconnected from each other.
¥ Adjustment or safety control device is open
¥ Faulty high point thermostat 5)(Fig.4)
¥ High point thermostat with reset push-button 6)(Fig.4) has operated
¥ Heating elements contactor failed
¥ Oil pressure switch 7)(Fig.4) open due to lack of or insufÞcient loop pressure
¥ Faulty Pt 100 probe or temperature controller
¥ Faulty temperature controller transformer
InsufÞcient pre-heating
¥ Tank heating elements interrupted
¥ Incorrectly set electronic thermostat
Pump not starting, when the temperature (approx.70
°
C)
is reached on the low point thermostat 4)(Fig.4).
¥ Faulty low point thermostat (not enabling)
¥ Pump motor thermal relay lock-out
¥ Faulty contactor
¥ Faulty pump
Burner not starting when SET2 temperature is reached.
¥ Temperature controller either faulty or with incorrect parameters
¥ Locked-out fan motor thermal relay
¥ Faulty capacitor (RN28)
¥ Faulty servomotor not going into 1st stage
Burner starting and then shutting down by lock-out.
¥ Short-circuited photocell
¥ Foreign light, ßame simulation
Hydraulic circuit not pressurising with consequent lock-
out at ignition.
¥ Valve 12)(Fig.4) not closing (coil interrupted, pre-heating element not operat-
ing)
Lock-out at ignition.
¥ Dirty or misshapen nozzle
¥ Incorrectly adjusted electrodes
¥ Faulty high voltage cables
¥ Faulty ignition transformer
¥ Fan motor thermal relay tripped
¥ 1st stage solenoid-valve on nozzle holder not opening
¥ Fuel leaking out of pistons 3)(Fig.35) preventing them from opening
¥ Faulty photocell or control box
¥ InsufÞcient pressure or temperature
¥ Flame detachment due to excessive air
Burner not passing to 2nd stage
¥ 2nd stage thermostat open
¥ Faulty or incorrectly set servomotor
¥ Servomotor cam III incorrectly positioned
¥ 2nd stage solenoid-valve on nozzle holder not opening
¥ Fuel leaking out of pistons 3)(Fig.35) preventing them from opening
Shut down during operation.
¥ Oil pressure switch 7)(Þg.4) tripped
¥ High or low point thermostat tripped
Lock-out during operation and attempt to repeat the
cycle.
¥ Pump or fan motor thermal relays tripped (RN 38 - RN 50)
¥ Flame detachment due to poor atomising or excessive air
Dirty combustion head.
¥ Dirty or misshapen nozzle
¥ Incorrect spray angle (45
°
preferable)
¥ Incorrectly adjusted combustion head
¥ InsufÞcient air for combustion
¥ Low oil temperature
GB
