Ignition Lockout; Flame On Before Gas Valve On; Low Water Pressure - IDEAL LOGIC+ SYSTEM2 S15 Installation & Servicing

4.3

IGNITION LOCKOUT

If the boiler is restarted does the
boiler ignite for a short time and
then extinguish?
YES
Check the electrode and
associated harness for:
continuity, visual condition and
position.
Refer to Section
3.9
Check if the condensate pipe is
blocked.
Replace as necessary
Check trap and condensate drain
pipe work for blockage and rectify
if necessary. Boiler now working
OK?
NO
Replace Gas Valve
4.4

FLAME ON BEFORE GAS VALVE ON

Restart the boiler, does Boiler Work OK?
NO
Replace Electrode
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)?
Are connections on water pressure switch secure?
50
Section 4 - Fault Finding
NO
Is the Gas Pressure available at
the Boiler Inlet (>18 mbar)?
Is approx 24V DC supply available
at the Gas Valve?
Unplug gas valve. Is resistance
between outside pins between
4k Ω (± 2)?
Check spark generator and
associated harness for: continuity
and visual condition.
Refer to Section
3.14
Are these functioning correctly?
YES
Check electrode and associated
harness for: continuity, visual
condition and position.
Refer to Section
3.9
Are these functioning correctly?
YES
Check routing and integrity of internal boiler wiring is OK.
Check condition of Electrode and replace if deteriorated.
YES
NO
Check gas supply and
rectify fault
YES
Check wiring connection
NO
from gas valve to
PCB for continuity. If
the wiring is OK then
YES
replace the PCB
NO
Replace Gas Valve
YES
NO
Replace Spark
Generator and harness
as necessary
YES
Replace Electrode and
NO
associated harness as
necessary
NO Fill and vent the system and open all
isolation valves
NO
Re-fit connections
Replace water pressure switch
YES
Installation and Servicing