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Condition Cause Rectification
Combustion head
Heavy soot deposits Defective nozzle Replace nozzle
Burner incorrectly set Correct settings
Amount of combustion air changed Reset burner
Boiler room insufficiently ventilated Ensure sufficient boiler room
ventilation as per local regulations
Diffuser
heavily soiled Burner incorrectly set Correct settings of mixing head
(CH. 7.5) and check burner setting
Wrong nozzle Chose different nozzle, if stability
allows use 45° nozzle
Pump pressure too high Select next larger nozzle size and
adjust pump pressure
Voltage supply
Signal lamp flashes orange / red Voltage supply low voltage < 170 V Check external supply voltage
Internal fuse F7 has tripped Replace fuse (6·3A slow)
(see Ch. 7.13)
Signal lamp flashes 3 x red/orange Voltage supply has excess Check external voltage supply
then short pause voltage > 260 V
Signal lamp remains off at No voltage available Check voltage supply
heat request from boiler control
Combustion manager defective Replace combustion manager
Solenoid valve
Solenoid valve does not open Coil defective Replace coil
Signal lamp flashes red/green Extraneous light Find source of light and eliminate
Solenoid valve does not close Foreign particles on valve seat Replace oil pump
tightly or in the protective filter
Servomotor
Servomotor does not run Plug connection incorrect Check plug connection
Servomotor defective Replace servomotor (CH. 7.11)
Servomotor starts briefly, Setting of limit switches incorrect Correct setting of limit switches,
then goes to lockout closed, partial load and switch point
(ST0/ST1/MV2) must not be set
above full load (ST2).
Switch point (MV2) must not be set
below partial load (ST1).
Servomotor does not run to Servomotor defective Check servomotor, if necessary
the set limit switch value replace
Air damper or angle drive seized Check air damper and angle drive
and replace if necessary
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