Troubleshooting - elco EK02B.12 L-Z Betriebsanleitung

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?
Malfunction
After thermostat shutdown the burner
fails to start.
Automatic unit emits no error
message.
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
After thermostat shutdown the burner
fails to start and emits the following
signal :
x x y y y
Burner starts up, switching shortly
after activation the ignition
transformer to malfunction mode,
emitting the following signal :
x y y y y
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.
Cause
Brownout or power cut.
No demand for heat via thermostat.
Fault in automatic unit.
Automatic unit has been locked
intentionally
Unauthorised flame during pre-ventilation
or pre-ignition
No flame at end of safety period
05/2005 - Art. Nr. 13 013 643B
m
Replace them with original
spare parts.
Solution
Determine cause of brownout or power
cut.
Check thermostat.
Replace automatic unit.
Reset automatic unit.
Replace solenoid valve.
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
25