02/2017 - Art. Nr. 4200 1015 6700D
26
Service
Troubleshooting
Fault diagnosis and repair
In the event of a malfunction, first check
that the prerequisites for correct
operation are fulfilled:
1.
Is the system connected to the
power supply?
2.
Is there 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.
adjusted correctly?
If the cause of the malfunction cannot be
ruled out by the checks described
above, check the functions associated
with individual burner parts.
Safety components must not be
repaired. They must always be replaced
with parts with the same order number.
Only use original spare parts.
Disconnect the electrical supply
before carrying out any
maintenance or cleaning work.
After any work in the system, check
combustion under normal operating
conditions (doors closed, cover
fitted, etc.). Enter the measurement
values in the boiler room
documentation.
Symbol
Symbol Fault
Cause
Remedy
No heat request
Thermostats defective or
incorrectly adjusted
Adjust the thermostats, replace if necessary.
Burner does not start.
No malfunction indicated
on the automatic
combustion control unit.
Drop in supply voltage or
power failure.
Control unit malfunction.
Check the cause of the fall in voltage or the
power failure.
Replace the control unit.
Burner starts at switch-on
for very short period
and then shuts down
The control unit has been
manually locked.
Reset control unit.
Burner starts and then
shuts down
after preventilation
Parasitic flame during
preventilation/
pre-ignition phase
Check ignition sparks/adjust or replace
electrode
Check/replace fuel-oil solenoid valve
Burner starts and then
shuts down after the
solenoid valves have
opened
No flame signal at end of
safety time
Check the oil level in the tank.
Top tank up as required.
Open the valves.
Check the oil pressure and the operation of
the pump, coupling, filter, solenoid valve.
Check ignition circuit, electrode adjustment.
Clean/replace electrodes.
Clean/replace flame monitor.
Replace the following items as required:
Ignition electrodes / ignition cables /
igniter / nozzle / pump /
solenoid valve / automatic combustion control
unit.
Flame extinguishing
during operation
Flame goes out during
operating phase
A4
Display
BP1
Push-button 1
Request: fault code
BP2
Push-button 2
Request: values
