elco VECTRON G 03.240 DUO PLUS, Operating Instructions Manual

35

05/2005 - Art. Nr. 13 018 071A

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?

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.

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.

Malfunction

Cause

Remedy

Burner fails to start after thermostat

signal.

No fault indication on control unit.

Brownout or power cut.

Fault in control unit.

Check for cause of reduction or failure of
power supply.
Replace control unit.

Burner fails to start.

Gas pressure normal.

Air-pressure switch in working order.

No request for heat.

Insufficient gas pressure

Gas pressure switch maladjusted or defective.
Air-pressure switch not in home position.

Thermostat defective or maladjusted.

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.

Burner activates briefly at startup,
then shuts down and emits following signal:

x x  y y y

-

y y y y y

Control unit has been shut down intentionally. Reset control unit.

Burner fails to start.

y y x x x

Air-pressure switch: not in home position
incorrectly adjusted fused contact

Readjust pressure-switch

.

Replace pressure-switch.

Burner-blower starts up. Burner fails to start.

x x x  y y

Air-pressure switch: Contact fails to close.

Examine pressure-switch and check wiring.
Readjust pressure-switch.

Burner shuts down during normal operation.

x x x x  y

Air-pressure switch: Contact opens at startup
or during continuous operation.

Readjust or replace pressure-switch.

Burner-blower starts up. Burner fails to start.

x x  y y y

Light scatter during pre-ventilation or
pre-ignition.

Replace valve.

Burner starts up, ignition sequence activates,
then stops

x  y y y y

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.

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.

Burner shuts down during normal operation.

y y y y x

Flame goes out during normal operation.

Check circuit of ionisation probe.
Check control unit, replacing as required.

EN