elco VECTRON L 04.410 DUO, Operating Instructions Manual, Page: 31 / 48

31 05/2005 - Art. Nr. 13 018 078A
Servicing
Troubleshooting
Fault diagnosis and repair
Before carrying out fault diagnosis,
check that the basic requirements for
correct operation are being fulfilled:
1.
Is the system connected to the
power supply?
2. Is there fuel-oil in the tank?
3. Are all shutoff valves open?
4. Are all regulating and safety
devices (boiler thermostat, low
water level detector, end-limit
switches, etc.) correctly adjusted?
If the fault cannot be rectified after
checking the above points, check with
the individual burner components
·
Observe the light signals emitted,
interpreting their meaning with the
table shown below.
Use readout program (available as an
optional accessory) to obtain further
in-depth information on the control
unit's operating and malfunction
procedures.
DO NOT attempt to repair safety
components.
m
Replace them with original
spare parts.
Malfunction Cause Solution
After thermostat shutdown the
burner fails to start.
Automatic unit emits no error
message.
Brownout or power cut.
No demand for heat via thermostat.
Fault in automatic unit.
Determine cause of brownout or power
cut.
Check thermostat.
Replace automatic unit.
Burner starts at switch-on for very
short period, then shuts down and
emits the following signal :
x x y y y
-
y y y y y
Automatic unit has been locked
intentionally Reset automatic unit.
After thermostat shutdown the
burner fails to start and emits the
following signal :
x x y y y
Unauthorised flame during pre-ventilation
or pre-ignition Replace solenoid valve.
Burner starts up, switching shortly
after activation the ignition
transformer to malfunction mode,
emitting the following signal :
x y y y y
No flame at end of safety period Check level of fuel-oil in tank.
Top tank up as required.
Open valves.
Check fuel-oil pressure and pump
operation, coupling, filter, solenoid valve.
Check ignition circuit, electrodes and
their settings.
Electrodes are to be cleaned.
Clean flame-monitoring device, or replace.
Replace the following items as required:
electrodes,
ignition cable,
transformer,
nozzle.
EN