11/2010 - Art. Nr. 4200 1029 8600A
23
Maintenance
Troubleshooting
Malfunction diagnosis and repair
In the event of a malfunction, 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 cause of the malfunction cannot be
ruled out by the checks described
above, check the functions of the
various burner components.
Important safety components must not
be repaired; these components must be
replaced by parts with the same part
number.
Only use original spare parts.
Switch off the power supply
before carrying out
maintenance or cleaning.
After any operation: check the
combustion performance under real
operating conditions (doors shut,
cover fitted etc.). Record the results
in the relevant documents.
Symbol
Observation
Cause
Corrective action
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 unit has
intentionally been manually
locked.
Unlock the unit.
The burner starts then stops
after pre-ventilation
Unauthorised flame is
detected during the pre-
ventilation/pre-ignition period
Check for the ignition spark/adjust the electrodes/
replace
Check/replace the fuel oil solenoid valve
Checking/replacing the cell
The burner starts and stops
after the solenoid valves have
opened
No flame at the end of the
safety time.
Check fuel oil level in tank.
Top the tank up as required.
Open the valves.
Check the fuel oil pressure and the operation of the
pump, coupling, filter and solenoid valve.
Check the ignition circuit, the electrodes and their
settings. Clean the electrodes.
Clean and replace the cell.
Replace the following parts as required:
ignition electrodes/ignition cables/
igniter/nozzle/pump/solenoid valve/safety unit.
Flame failure during
operation.
The flame goes out during the
operating phase
Servomotor fault
Clogging of the air flap
Locking of the air flap
Internal fault with the
servomotor
Replace the servomotor
en
