02/2016 - Art. Nr. 4200 1046 8202A
27
en
Servicing
Fault repair
Cause of faults and troubleshooting
In the event of a fault, first check that the
prerequisites for correct operation are
fulfilled:
1.
Is there any current?
2.
Is there fuel oil in the tank?
3.
Are all shut-off valves open?
4.
Are all control and safety devices,
such as the boiler thermostat, low-
water detector, limit switch, etc.
correctly set?
If the fault cannot be remedied by the
checks described above, check the
functions of the various burner
components.
Components which fulfil an important
safety function must not be repaired.
These components must be replaced by
parts with the same reference number.
Only use original spare parts.
Switch off the power supply
before carrying out
maintenance or cleaning.
After every operation: check the
combustion parameters and real
operating condition (doors closed,
cover fitted etc.). Record the results
in the relevant documents.
Symbol
Malfunction
Cause
Remedy
The thermostat no longer
starts the burner.
No heat requested by
thermostats.
Defective control unit.
Check/replace the thermostat.
Replace the control unit.
The burner starts up briefly
when the power supply is
switched on and then stops.
The control and safety unit
has been manually locked.
Unlock the unit.
The burner starts then stops
after pre-ventilation.
Stray light detected during the
pre-ventilation/pre-ignition
period.
Check for the ignition spark/adjust or replace the
electrodes.
Check/replace the fuel oil solenoid valve.
Check/Replace the flame detector tube.
The burner starts and stops
after the solenoid valves have
opened.
No flame at the end of the
safety time
Check the fuel oil level in the tank.
Top up tank as required.
Open the valves.
Check the oil pressure and the operation of the
pump, coupling, filter, solenoid valve.
Check the ignition circuit, electrodes and their
settings. Clean the electrodes.
Clean the flame detector, or replace.
Replace the following parts as required:
ignition electrodes/ignition cables/
igniter/nozzle/pump/solenoid valve/safety unit.
Flame extinguishing during
operation.
The flame goes out during
operation.
Fan motor fault.
Fan blockage.
Internal fault with the fan
motor.
Replace the fan motor.
Burner does not start.
Air pressure switch: not in rest
position.
Incorrect adjustment.
Contact welded.
Readjust the pressure switch.
Check the wiring.
Replace the pressure switch.
Burner does not start.
Heater defective.
Replace the heater.
