4.3 IGNITION LOCKOUT
If the boiler is restarted does the
boiler ignite for a short time and
then extinguish?
YES
Is the Gas Pressure available at
the Boiler Inlet (>18 mbar)?
Check the electrode and
associated harness for: continuity,
visual condition and position
Check if the condensate pipe is
blocked.
Replace as necessary
NO
Check gas supply and
rectify fault
NO
YES
Is approx 24 Vdc supply available at
the Gas Valve?
YES
Check spark generator and
associated harness for: continuity
and visual condition
Are these functioning correctly?
YES
Check electrode and associated
harness for: continuity, visual
condition and position
Are these functioning correctly?
Check trap and condensate drain
pipe work for blockage and rectify
if necessary. Boiler now working
OK?
Check wiring connection
from gas valve to
PCB for continuity. If
the wiring is OK then
replace the PCB
NO
Replace Spark
Generator and harness
as necessary
NO
Replace Electrode and
associated harness as
necessary
NO
Replace Gas Valve
NO
Unplug gas valve. Is resistance
between outside pins between
4 k
Ω
(± 2)?
YES
Replace Gas Valve
NO
YES
Refer to Section
3.9
Refer to Section
3.9
4.4 FLAME ON BEFORE GAS VALVE ON
4.5 LOW WATER PRESSURE
Are the Boiler and CH System filled with water and all isolation and
radiator valves open (check pressure gauge is between 1 to 1.5 bar)?
NO
NO
YES
Fill and vent the system and open all
isolation valves
YES
Are connections on water pressure switch secure?
Re-fit connections
Replace water pressure switch
Refer to Section
3.15
Restart the boiler, does Boiler Work OK?
NO
Check routing and integrity of internal boiler wiring is OK
Check condition of Electrode and replace if deteriorated
YES
Replace Electrode
57
Installation and Servicing
Section 4 - Fault Finding
FAUL
T FINDING
