L6' - False Flame Lockout; F1' - Low Water Pressure; F2' Or 'Fn' Or 'Ln' - Flame Loss; F3' - Fan Fault - Keston System s30 Installation And Servicing Instructions

4.4 'L6' - FALSE FLAME LOCKOUT

Restart the boiler, does Boiler Work OK?
Separate the flame detection electrode in-line
connector. Is there continuity between the terminals
pins connected to the electrode?
RESTART PROCEDURE - To restart boiler, press the "RESTART" button.

4.5 'F1' - LOW WATER PRESSURE

Is 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 sensor secure?

4.6 'F2' OR 'Fn' OR 'Ln' - FLAME LOSS

Does the boiler ignite for a short
time and then extinguish?
YES
Check the detection electrode and
associated harness for: continuity,
visual condition and position
(Refer to Section 3.14). Check if
condensate pipe is blocked. Check
if flue is blocked.
Replace as necessary

4.7 'F3' - FAN FAULT

Does the wiring from the Fan to the PCB have secure connections at
both ends and has not deteriorated? Does the wiring have continuity?
Is there 230Vac at the Blue and Brown connections
to the 3 way connection on the Fan?
54
SECTION 4 - FAULT FINDING
NO
YES
Is the Gas Pressure available at
NO
the Boiler Inlet (18 mbar)?
Is 24Vdc supply available at the Gas
Valve while the flame is on?
Check spark generator and associated
harness for: continuity and visual
condition. (Refer to Section 3.15) Are
these functioning correctly?
Check ignition electrode and associated
harness for: continuity, visual condition
and position. (Refer to Section 3.13) Are
these functioning correctly?
Check siphon and condensate drain pipe
work for blockage and rectify if necessary.
Boiler now working OK?
YES
Check routing and integrity of internal boiler
YES
wiring is OK. Check condition of Flame Sense
Electrode and replace if deteriorated.
YES
Replace Flame Detection Electrode
NO
Check routing and integrity of internal boiler wiring.
NO
Fill and vent the system and open all isolation valves
NO
Re-fit connections
YES
Replace water pressure sensor
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
NO
YES
Check gas supply and
rectify fault
Check wiring from gas
valve to PCB for continuity.
If the wiring is OK then
replace the PCB
Replace Spark Generator
and Harness as necessary.
Replace Ignition
Electrode and
associated harness as
necessary
Replace Gas Valve
Rectify Wiring & connections
Replace PCB
Replace Fan
Installation and Servicing