420010492200
EN
Fault diagnosis and repair
In the event of a malfunction, first check
that the prerequisites for correct
operation are fu llfilled:
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 malfunction persists, use the
following table.
It is not permitted to repair any
components relevant to safety. These
components must be replaced by parts
with the same order number.
Only use original spare parts.
NB: after each operation:
• under normal operating conditions
(doors closed, hood fitted, etc.), check
combustion and check the individual
lines for leaks.
• Record the results in the relevant
documents.
Service
- Troubleshooting
Symbol fault Fault 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 unit has intentionally been
manually locked.
Unlock the unit
The burner starts then stops after pre-
ventilation
Flaring during pre-ventilation or pre-
ignition
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.
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