elco VECTRON G 03.200 DUO Betriebsanleitung Seite 35

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 the system connected to the
gas supply?
3. Is the gas shutoff cock open ?
4. Are all regulating and safety
devices (boiler thermostat, low
water level detector, end-limit
switches, etc.) correctly adjusted?
Malfunction
Burner fails to start after thermostatsignal.
No fault indication on control unit.
Burner fails to start.
Gas pressure normal.
Air-pressure switch in working order.
No request for heat.
Burner activates briefly at startup,
then shuts down and emits following signal:
x x y y y - y y y y y
Burner fails to start.
y y x x x
Burner-blower starts up. Burner fails to start.
x x x y y
Burner shuts down during normal operation.
x x x x y
Burner-blower starts up. Burner fails to start.
x x y y y
Burner starts up, ignition sequence activates,
then stops
x y y y y
Burner shuts down during normal operation.
y y y y x
If the malfunction persists:
· Note any blink-codes emitted by the
control unit, and check their meaning
with the following table. It is possible,
using the readout device (available
as an optional accessory), to obtain
further in-depth information on the
system's operating and malfunction
procedures.
DO NOT attempt to repair safety
components. Replace them with
original parts bearing the same order
number.
m
Use ORIGINAL spares only.
Cause
Brownout or power cut.
Fault in control unit.
Insufficient gas pressure
Gas pressure switch maladjusted or defective.
Air-pressure switch not in home position.
Thermostat defective or maladjusted.
Control unit has been shut down intentionally. Reset control unit.
Air-pressure switch: not in home position
incorrectly adjusted fused contact
Air-pressure switch: Contact fails to close.
Air-pressure switch: Contact opens at startup
or during continuous operation.
Light scatter during pre-ventilation or
pre-ignition.
No flame present at end of safety period.
Gas throughput rate incorrectly adjusted.
Fault in flame-monitoring circuit.
No ignition arc.
Electrode(s) shorted.
Ignition cable damaged or defective.
Ignition transformer defective.
Control unit.
Solenoid valves fail to open.
Valves jammed.
Flame goes out during normal operation.
03/2005 - Art. Nr. 13 018 069A
Note:
After each intervention:
· Check combustion performance and
examine the individual conduits for
signs of leaks under real operating
conditions (doors shut, hood fitted,
etc.).
· Note down the results in the
corresponding report forms.
Remedy
Check for cause of reduction or failure of
power supply.
Replace control unit.
Check gas conduits.
Clean filter.
Check gas pressure switch or replace
compact gas-fired unit.
Readjust or replace air-pressure switch.
Readjust or replace thermostat.
Readjust pressure-switch.
Replace pressure-switch.
Examine pressure-switch and check wiring.
Readjust pressure-switch.
Readjust or replace pressure-switch.
Replace valve.
Regulate gas throughput rate.
Check general state and adjustment settings
of ionisation probe by connecting to earth
(ground).
Check general state and connections of
ionisation circuit (wiring and measuring
bridge).
Clean and adjust ignition electrode(s),
replacing as required.
Connect or replace ignition cable.
Replace transformer.
Replace control unit.
Check wiring between control unit and
external components.
Check coil, replacing as required.
Replace valve.
Check circuit of ionisation probe.
Check control unit, replacing as required.
EN
35